mirror of
https://github.com/pytorch/pytorch.git
synced 2025-10-20 21:14:14 +08:00
d68403df3b
Pull Request resolved: https://github.com/pytorch/pytorch/pull/139816 Approved by: https://github.com/ezyang
1929 lines
67 KiB
Python
1929 lines
67 KiB
Python
# mypy: allow-untyped-defs
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import builtins
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import contextlib
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import dataclasses
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import functools
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import inspect
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import itertools
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import json
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import logging
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import math
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import operator
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import os
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import sys
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import textwrap
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import time
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from collections import namedtuple
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from concurrent.futures import as_completed, ThreadPoolExecutor
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from io import StringIO
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from typing import Any, Callable, Dict, List, Optional, Tuple, Type, TypeVar, Union
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from unittest.mock import patch
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import sympy
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import torch
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import torch._inductor.async_compile # noqa: F401 required to warm up AsyncCompile pools
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from torch._dynamo.testing import rand_strided
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from torch._dynamo.utils import counters, dynamo_timed, identity, preserve_rng_state
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from torch.utils._filelock import FileLock
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from . import config, ir
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from .autotune_process import (
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TensorMeta,
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TritonBenchmarkRequest,
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TritonCPUBenchmarkRequest,
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TritonGPUBenchmarkRequest,
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)
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from .codecache import code_hash, PersistentCache, PyCodeCache
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from .codegen.common import (
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CSEVariable,
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IndentedBuffer,
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KernelTemplate,
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OpOverrides,
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WorkspaceArg,
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)
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from .codegen.simd_kernel_features import SIMDKernelFeatures
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from .codegen.triton import (
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gen_common_triton_imports,
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texpr,
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TritonKernel,
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TritonScheduling,
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)
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from .codegen.triton_utils import config_of, signature_to_meta
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from .exc import CUDACompileError
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from .ir import ChoiceCaller, PrimitiveInfoType
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from .ops_handler import StoreMode
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from .runtime.benchmarking import benchmarker
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from .runtime.hints import DeviceProperties
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from .utils import (
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FakeIndentedBuffer,
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get_dtype_size,
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Placeholder,
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restore_stdout_stderr,
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sympy_dot,
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sympy_index_symbol,
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sympy_product,
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triton_type_to_torch,
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unique,
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)
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from .virtualized import V
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log = logging.getLogger(__name__)
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# correctness checks struggle with fp16/tf32
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VERIFY: Dict[str, Any] = {}
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PRINT_AUTOTUNE = True
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DEBUG = False
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class KernelNamespace:
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pass
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# these objects are imported from the generated wrapper code
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extern_kernels = KernelNamespace()
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_T = TypeVar("_T", bound="AutotuneArgs")
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@dataclasses.dataclass
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class BenchmarkTensors:
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"""Represents a set of inputs and outputs for autotuning with a template"""
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input_tensors: List[torch.Tensor]
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output_tensor: Optional[torch.Tensor]
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def unpack(self):
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return self.input_tensors, self.output_tensor
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@dataclasses.dataclass
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class AutotuneArgs:
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"""During autotuning, we need to pass the same inputs to all choices.
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Note:
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Since we typically have a mix of external choices and triton choices, we create
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two lists of inputs for the same underlying buffers:
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- External inputs (for aten kernels): Include offset for sliced tensors
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- Triton inputs: Use base pointer for sliced tensors, without offset
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"""
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triton: BenchmarkTensors
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extern: BenchmarkTensors
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expected: Optional[torch.Tensor] = None
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def get_benchmark_tensors(self, extern=False) -> BenchmarkTensors:
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"""Returns the inputs and output tensors for a given choice."""
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bench_tensors = self.extern if extern else self.triton
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return bench_tensors
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@classmethod
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def from_choice_args(
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cls: Type[_T],
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example_inputs: List[torch.Tensor],
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example_inputs_extern: List[torch.Tensor],
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out: torch.Tensor,
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out_extern: torch.Tensor,
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expected: Optional[torch.Tensor] = None,
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) -> _T:
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"""Factory method to create AutotuneInputs from separate inputs/outputs"""
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return cls(
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triton=BenchmarkTensors(example_inputs, out),
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extern=BenchmarkTensors(example_inputs_extern, out_extern),
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expected=expected,
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)
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def verify(self, **kwargs):
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"""Verify the correctness of the benchmarking results"""
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torch.testing.assert_close(self.extern.output_tensor, self.expected, **kwargs)
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class PartialRender:
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"""
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Some parts of a template need to be generated at the end, but
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inserted into the template at the start. This allows doing a bunch
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of replacements after the initial render.
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"""
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def __init__(self, code, replacement_hooks) -> None:
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super().__init__()
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self.code = code
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self.replacement_hooks = replacement_hooks
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def finalize_hook(self, hook_key: str, strict=True) -> None:
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if hook_key not in self.replacement_hooks:
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if strict:
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raise RuntimeError(
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f"{hook_key} not registered in self.replacement_hooks"
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)
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else:
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return
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assert (
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self.replacement_hooks[hook_key] is not None
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), "hook_key can only be called once"
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self.code = self.code.replace(hook_key, self.replacement_hooks[hook_key]())
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self.replacement_hooks[hook_key] = None
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def finalize_all(self) -> str:
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for key, fn in self.replacement_hooks.items():
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self.code = self.code.replace(key, fn())
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return self.code
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# This is used to store info needed for lowering each subgraph in triton
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# templates
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SubgraphInfo = namedtuple(
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"SubgraphInfo",
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[
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"body",
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"template_mask",
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"template_out",
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],
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)
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class ModificationWrapper(V.WrapperHandler): # type: ignore[name-defined]
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"""Handles placeholder substitutions during subgraph processing."""
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def __init__(
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self,
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kernel,
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subgraph_number: int,
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fixed_inputs: Dict[str, Any],
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mask: Optional[str],
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):
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super().__init__(V.ops)
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self.name = f"PlaceholderSubstitution_{subgraph_number}"
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self.kernel = kernel
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self.fixed_inputs = fixed_inputs
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self.mask = mask
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def load(self, name: str, index: sympy.Expr):
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"""Handle loading from tensor or fixed input."""
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if name not in self.fixed_inputs:
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index_str = self._process_indexing(index)
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var = self._add_kernel_input(name)
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return f"tl.load({var} + {index_str})"
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return f"({self.fixed_inputs[name]})"
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def indirect_indexing(self, index_var: str, size, check, wrap_neg=True):
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"""Convert index variable to symbolic form."""
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return sympy_index_symbol(str(index_var))
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def store(
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self, name: str, index: sympy.Expr, value: CSEVariable, mode: StoreMode = None
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) -> str:
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"""Currently only supports stores for atomic adds coming from scatter nodes
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This is used by flex_attention's backwards grad for captured buffers, see
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zeros_and_scatter lowering
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"""
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assert (
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self.mask is not None
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), "Mask is required for inner stores in modifications"
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assert mode == "atomic_add", "Only atomic_add is supported for inner stores"
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buf_name = self._add_kernel_input(name)
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index_str = self._process_indexing(index)
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index_str = f"tl.broadcast_to({index_str}, {value}.shape)"
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store = f"tl.atomic_add({buf_name} + {index_str}, {value}, {self.mask}, sem='relaxed')"
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return store
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def _add_kernel_input(self, name: str):
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"""Add name as input to kernel and return input ref."""
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return self.kernel.args.input(name)
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def _process_indexing(self, index):
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"""Process and rename indexing, adding symbols as kernel inputs."""
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return self.kernel.kexpr(self.kernel.rename_indexing(index))
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class TritonTemplateKernel(TritonKernel):
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def __init__(
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self,
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kernel_name,
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input_nodes,
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output_node,
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defines,
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num_stages,
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num_warps,
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grid_fn,
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meta,
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call_sizes,
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use_jit=False,
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prefix_args=0,
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suffix_args=0,
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epilogue_fn=identity,
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subgraphs: Optional[List[ir.ComputedBuffer]] = None,
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workspace_arg: Optional[WorkspaceArg] = None,
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) -> None:
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numel = sympy_product(output_node.get_size())
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super().__init__(
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{
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"x": numel,
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"r": sympy.S.One,
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},
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features=SIMDKernelFeatures([], numel),
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)
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self.input_nodes = input_nodes
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self.output_node = output_node
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self.named_input_nodes = {} # type: ignore[var-annotated]
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self.defines = defines
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self.kernel_name = kernel_name
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self.use_jit = use_jit
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self.num_stages = num_stages
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self.num_warps = num_warps
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self.grid_fn = grid_fn
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self.meta = meta
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self.call_sizes = call_sizes
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# for templates with fixed epilogues
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self.prefix_args = prefix_args
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self.suffix_args = suffix_args
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self.epilogue_fn = epilogue_fn
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self.render_hooks = {} # type: ignore[var-annotated]
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self.triton_meta: Optional[Dict[str, object]] = None
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# For Templated Attention this can be a list of ir.Subgraph
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self.subgraphs: Optional[List[ir.ComputedBuffer]] = subgraphs
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# Some templates use extra global memory as a workspace
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self.workspace_arg = workspace_arg
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if workspace_arg is not None:
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self.args.workspace_args.append(workspace_arg)
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# The following attributes (body, template_mask, output_val) are all
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# used for triton kernel codegen.
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# They are swapped onto the TritonTemplateKernel object by
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# `set_subgraph_body`
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self.subgraph_bodies: Dict[str, SubgraphInfo] = {}
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self.body: IndentedBuffer = FakeIndentedBuffer()
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self.template_mask: Optional[str] = None
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self.template_out: Optional[str] = None
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@contextlib.contextmanager
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def set_subgraph_body(self, body_name: str):
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old_body, old_mask, old_out = self.body, self.template_mask, self.template_out
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assert body_name in self.subgraph_bodies, body_name
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self.body, self.template_mask, self.template_out = self.subgraph_bodies[
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body_name
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]
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yield
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self.subgraph_bodies[body_name] = SubgraphInfo(
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self.body, self.template_mask, self.template_out
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)
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self.body, self.template_mask, self.template_out = old_body, old_mask, old_out
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@contextlib.contextmanager
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def create_subgraph_body(self, body_name: str):
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assert body_name not in self.subgraph_bodies
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self.subgraph_bodies[body_name] = SubgraphInfo(IndentedBuffer(), None, None)
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with self.set_subgraph_body(body_name):
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yield
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def need_numel_args(self):
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return False
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def estimate_kernel_num_bytes(self):
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"""
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Estimate the total number of bytes this kernel takes.
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For in/out nodes, sizes are counted twice: once for reading and
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once for writing.
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"""
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ninplace_args = len(unique(self.args.inplace_buffers.values()))
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num_bytes = []
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for i, inp in enumerate(itertools.chain(self.input_nodes, (self.output_node,))):
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size = V.graph.sizevars.size_hints(inp.get_size())
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numel = functools.reduce(operator.mul, size, 1)
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dtype_size = get_dtype_size(inp.get_dtype())
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num_bytes.append(numel * dtype_size * (1 + int(i < ninplace_args)))
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return sum(num_bytes)
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def jit_lines(self):
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if self.use_jit:
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return "@triton.jit"
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argdefs, _, signature, _ = self.args.python_argdefs()
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triton_meta: Dict[str, Any] = {
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"signature": signature_to_meta(
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signature, size_dtype=self.index_dtype, argdefs=argdefs
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),
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"device": DeviceProperties.create(self.output_node.get_device()),
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"constants": {},
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}
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triton_meta["configs"] = [config_of(signature)]
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for arg_num in triton_meta["configs"][0].equal_to_1: # type: ignore[index]
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triton_meta["constants"][signature[arg_num].name] = 1 # type: ignore[index]
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matrix_instr_nonkdim = self.meta.get("matrix_instr_nonkdim", 0)
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if matrix_instr_nonkdim != 0:
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triton_meta["matrix_instr_nonkdim"] = matrix_instr_nonkdim
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self.triton_meta = triton_meta
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inductor_meta = {
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"kernel_name": str(Placeholder.DESCRIPTIVE_NAME),
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**TritonKernel.inductor_meta_common(),
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}
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if config.profile_bandwidth or config.benchmark_kernel:
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num_gb = self.estimate_kernel_num_bytes() / 1e9
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inductor_meta["kernel_num_gb"] = num_gb
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return f"""
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@triton_heuristics.template(
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num_stages={self.num_stages},
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num_warps={self.num_warps},
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triton_meta={triton_meta!r},
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inductor_meta={inductor_meta!r},
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)
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@triton.jit
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"""
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def gen_argdefs(self):
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def hook():
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# python_argdefs() cannot be run until after the rest of the template lazily adds more args
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arg_defs, *_ = self.args.python_argdefs()
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return f"{', '.join(arg_defs)}"
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self.render_hooks["<ARGDEFS>"] = hook
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return "<ARGDEFS>"
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def gen_defines(self):
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return self.defines
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def def_kernel(self, *argnames):
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"""
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Hook called from template code to generate function def and
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needed args.
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"""
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assert all(isinstance(x, str) for x in argnames)
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renames = IndentedBuffer(initial_indent=1)
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named_args = self.input_nodes[
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self.prefix_args : len(self.input_nodes) - self.suffix_args
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]
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assert len(argnames) == len(named_args), (
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len(argnames),
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len(named_args),
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self.prefix_args,
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len(self.input_nodes),
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)
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for input_node in self.input_nodes[: self.prefix_args]:
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# get args in correct order
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self.args.input(input_node.get_name())
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for name, input_node in zip(argnames, named_args):
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arg_name = f"arg_{name}"
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self.named_input_nodes[name] = input_node
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self.args.input_buffers[input_node.get_name()] = arg_name
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# The args may be duplicated, so renaming must be after args are de-duplicated.
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for name in argnames:
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input_node = self.named_input_nodes[name]
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arg_name = self.args.input_buffers[input_node.get_name()]
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if input_node.get_layout().offset == 0:
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renames.writeline(f"{name} = {arg_name}")
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else:
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offset = texpr(self.rename_indexing(input_node.get_layout().offset))
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renames.writeline(f"{name} = {arg_name} + {offset}")
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for input_node in self.input_nodes[len(self.input_nodes) - self.suffix_args :]:
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# get args in correct order
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self.args.input(input_node.get_name())
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def hook():
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# python_argdefs() cannot be run until after the rest of the template lazily adds more args
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arg_defs, *_ = self.args.python_argdefs()
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code = IndentedBuffer()
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code.splice(gen_common_triton_imports())
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code.splice(self.jit_lines())
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code.writeline(f"def {self.kernel_name}({', '.join(arg_defs)}):")
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with code.indent():
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code.splice(self.defines)
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code.splice(renames.getvalue())
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return code.getvalue()
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assert "<DEF_KERNEL>" not in self.render_hooks
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self.render_hooks["<DEF_KERNEL>"] = hook
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return "<DEF_KERNEL>"
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def size(self, name: str, index: int):
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"""
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Hook called from template code to get the size of an arg.
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Will add needed args to pass it in if it is dynamic.
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"""
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assert isinstance(index, int)
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if name is None:
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val = self.output_node.get_size()[index]
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else:
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assert isinstance(name, str)
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val = self.named_input_nodes[name].get_size()[index]
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return texpr(self.rename_indexing(val))
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def stride(self, name, index=None):
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"""
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Hook called from template code to get the stride of an arg.
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Will add needed args to pass it in if it is dynamic.
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"""
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if name is None:
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val = self.output_node.get_stride()
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else:
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assert isinstance(name, str)
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val = self.named_input_nodes[name].get_stride()
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if isinstance(index, int):
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return texpr(self.rename_indexing(val[index]))
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return ", ".join([texpr(self.rename_indexing(i)) for i in val])
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def _get_subgraph(self, subgraph_number: int):
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assert isinstance(subgraph_number, int)
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assert isinstance(self.subgraphs, list)
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assert subgraph_number < len(
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self.subgraphs
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), f"Invalid subgraph number provided to create_modification, {subgraph_number} must be < {len(self.subgraphs)}"
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assert (
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self.body.getvalue() == ""
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), "Body should be clear before adding a modification"
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return self.subgraphs[subgraph_number]
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def _handle_scatter_graph(self, scatter_graph):
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"""Handle processing for a single scatter graph.
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Args:
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scatter_graph: The scatter graph to process
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"""
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assert isinstance(
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scatter_graph, ir.ComputedBuffer
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), f"scatter_graph must be an instance of ComputeBuffer but got {type(scatter_graph)}"
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|
|
def contiguous_strides(x):
|
|
# We always create a fresh contiguous grad for scattering into
|
|
return sum(
|
|
x_i * stride for x_i, stride in zip(x, scatter_graph.get_stride())
|
|
)
|
|
|
|
return scatter_graph.data.store_output(scatter_graph.name, contiguous_strides, []) # type: ignore[attr-defined]
|
|
|
|
def modification(
|
|
self,
|
|
subgraph_number: int,
|
|
output_name: Optional[str],
|
|
mask: Optional[str] = None,
|
|
**fixed_inputs,
|
|
) -> str:
|
|
"""This creates a modification function for a subgraph.
|
|
To use this inside a template, the first argument should specify which subgraph to codegen for
|
|
|
|
Args:
|
|
subgraph_number (int): The index of the subgraph in self.subgraphs
|
|
output_name (Optional[str]): The name of the output variable to store the result in
|
|
mask (Optional[str]): An optional mask to use for the store operation. If provided, this mask
|
|
will be applied to the store.
|
|
"""
|
|
num = 0
|
|
out = None
|
|
scatters = []
|
|
while f"mod_{subgraph_number}_{num}" in self.subgraph_bodies:
|
|
num += 1
|
|
with self.create_subgraph_body(f"mod_{subgraph_number}_{num}"):
|
|
subgraph = self._get_subgraph(subgraph_number)
|
|
modification_handler = ModificationWrapper(
|
|
self, subgraph_number, fixed_inputs, mask
|
|
)
|
|
with V.set_ops_handler(modification_handler):
|
|
assert isinstance(
|
|
subgraph, (ir.ComputedBuffer, List)
|
|
), f"Expected the subgraph to be a ComputedBuffer or a List[ComputedBuffer], got {type(subgraph)}"
|
|
# Handle scatter stores
|
|
if isinstance(subgraph, list):
|
|
for scatter_graph in subgraph:
|
|
scatters.append(self._handle_scatter_graph(scatter_graph))
|
|
elif isinstance(subgraph.data, ir.InputBuffer):
|
|
out = subgraph.data.make_loader()(())
|
|
else:
|
|
out = subgraph.data.inner_fn(())
|
|
|
|
self.codegen_body()
|
|
if output_name is not None:
|
|
assert isinstance(output_name, str)
|
|
assert out is not None
|
|
self.body.writeline(f"{output_name} = {out.value}")
|
|
else:
|
|
assert out is None
|
|
for scatter in scatters:
|
|
self.body.writeline(str(scatter))
|
|
|
|
body_val = self.body.getvalue()
|
|
self.cse.invalidate(set()) # type: ignore[arg-type]
|
|
return body_val
|
|
|
|
def store_output(
|
|
self,
|
|
indices: Union[List[Any], Tuple[Any]],
|
|
val: str,
|
|
mask: Optional[str] = None,
|
|
indent_width: int = 4,
|
|
):
|
|
"""Stores the final output and appends any epilogue fusions if the buffer hasn't been optimized away.
|
|
|
|
Args:
|
|
indices (Union[List, Tuple]): The index for each dimension of the output. The dot product of
|
|
these indices and output strides must match `val`.
|
|
val (str): The value to store.
|
|
mask (Optional[str]): An optional mask to use for the store operation. If provided, this mask
|
|
will be applied to the store.
|
|
indent_width (int): The number of spaces to use for indentation. This is used when the call to
|
|
store_output is indented in the kernel definition.
|
|
"""
|
|
with self.create_subgraph_body("<STORE_OUTPUT>"):
|
|
assert isinstance(indices, (list, tuple))
|
|
assert isinstance(val, str)
|
|
assert isinstance(mask, (str, type(None)))
|
|
assert self.template_mask is None
|
|
indices = list(map(OpOverrides.paren, indices))
|
|
index_symbols = [sympy.Symbol(x, integer=True) for x in indices]
|
|
lengths = [
|
|
V.graph.sizevars.simplify(s) for s in self.output_node.get_size()
|
|
]
|
|
assert len(indices) == len(lengths)
|
|
|
|
# glue to make generated code use same indexing from template
|
|
for name, range_tree_entry in zip(
|
|
indices, self.range_trees[0].construct_entries(lengths)
|
|
):
|
|
range_tree_entry.set_name(name)
|
|
contiguous_index = sympy_dot(
|
|
ir.FlexibleLayout.contiguous_strides(lengths), index_symbols
|
|
)
|
|
contiguous_index = self.rename_indexing(contiguous_index)
|
|
self.body.writeline("xindex = " + texpr(contiguous_index))
|
|
self.range_trees[0].lookup(sympy.S.One, sympy_product(lengths)).set_name(
|
|
"xindex"
|
|
)
|
|
self.template_mask = mask
|
|
self.template_out = val
|
|
self.template_indices = indices
|
|
output_index = self.output_node.get_layout().make_indexer()(index_symbols)
|
|
output_index = self.rename_indexing(output_index)
|
|
if output_index == contiguous_index:
|
|
output_index = sympy.Symbol("xindex", integer=True)
|
|
|
|
acc_dtype = (
|
|
triton_type_to_torch(self.meta["ACC_TYPE"])
|
|
if "ACC_TYPE" in self.meta
|
|
else torch.float32
|
|
)
|
|
epilogue_args = [V.kernel.cse.namedvar(val, dtype=acc_dtype)]
|
|
for input_node in itertools.chain(
|
|
self.input_nodes[: self.prefix_args],
|
|
self.input_nodes[len(self.input_nodes) - self.suffix_args :],
|
|
):
|
|
input_node.freeze_layout()
|
|
epilogue_args.append(input_node.make_loader()(index_symbols))
|
|
|
|
V.ops.store(
|
|
self.output_node.get_name(),
|
|
output_index,
|
|
self.epilogue_fn(*epilogue_args),
|
|
)
|
|
self.codegen_body()
|
|
|
|
def hook():
|
|
# more stuff might have been added since the codegen_body above
|
|
self.codegen_body()
|
|
|
|
return textwrap.indent(self.body.getvalue(), " " * indent_width).strip()
|
|
|
|
assert "<STORE_OUTPUT>" not in self.render_hooks
|
|
self.render_hooks["<STORE_OUTPUT>"] = hook
|
|
return "<STORE_OUTPUT>"
|
|
|
|
def render(self, template, kwargs):
|
|
return PartialRender(
|
|
template.render(**self.template_env(), **kwargs),
|
|
self.render_hooks,
|
|
)
|
|
|
|
def make_load(self, name, indices, mask):
|
|
"""
|
|
Optional helper called from template code to generate the code
|
|
needed to load from an tensor.
|
|
"""
|
|
assert isinstance(indices, (list, tuple))
|
|
assert isinstance(name, str)
|
|
assert isinstance(mask, str)
|
|
stride = self.named_input_nodes[name].get_stride()
|
|
indices = list(map(OpOverrides.paren, indices))
|
|
assert len(indices) == len(stride)
|
|
index = " + ".join(
|
|
f"{texpr(self.rename_indexing(s))} * {i}" for s, i in zip(stride, indices)
|
|
)
|
|
return f"tl.load({name} + ({index}), {mask}, other=0.0)"
|
|
|
|
def template_env(self):
|
|
"""
|
|
Generate the namespace visible in the template.
|
|
"""
|
|
return {
|
|
fn.__name__: fn
|
|
for fn in [
|
|
self.def_kernel,
|
|
self.size,
|
|
self.stride,
|
|
self.store_output,
|
|
self.make_load,
|
|
self.modification,
|
|
self.gen_argdefs,
|
|
self.gen_defines,
|
|
]
|
|
}
|
|
|
|
def indexing(
|
|
self,
|
|
index: sympy.Expr,
|
|
*,
|
|
dense_indexing=False,
|
|
copy_shape=None,
|
|
override_mask=None,
|
|
block_ptr=False,
|
|
):
|
|
"""
|
|
Override the default indexing to use our custom mask and force
|
|
dense indexing.
|
|
"""
|
|
return super().indexing(
|
|
index,
|
|
dense_indexing=False,
|
|
# We pass template_out as the shape to broadcast the indexing to as
|
|
# the mask might be broadcast to the output shape
|
|
copy_shape=self.template_out,
|
|
override_mask=self.template_mask,
|
|
block_ptr=block_ptr,
|
|
)
|
|
|
|
def codegen_range_tree(self):
|
|
pass # ignore default codegen
|
|
|
|
def call_kernel(self, name: str, node: Optional[ir.IRNode] = None):
|
|
wrapper = V.graph.wrapper_code
|
|
_, call_args, _, arg_types = self.args.python_argdefs()
|
|
|
|
# Handle workspace allocation
|
|
if self.workspace_arg is not None:
|
|
wrapper.generate_workspace_allocation(self.workspace_arg)
|
|
|
|
if V.graph.cpp_wrapper:
|
|
# In the cpp_wrapper case, we have to compute CUDA launch grid at runtime
|
|
# if any dynamic dimension is involved. We rely on the Python version
|
|
# of the grid function to generate those grid configs, which may contain
|
|
# symbolic values. The wrapper will use cexpr to print out C++ code
|
|
# appropriately for the grid configs.
|
|
grid = self.call_sizes + [self.meta]
|
|
wrapper.generate_kernel_call(
|
|
name,
|
|
call_args,
|
|
grid=self.grid_fn(*grid),
|
|
arg_types=arg_types,
|
|
triton_meta=self.triton_meta,
|
|
)
|
|
else:
|
|
wrapper.add_import_once(f"import {self.grid_fn.__module__}")
|
|
meta = wrapper.add_meta_once(self.meta)
|
|
grid = self.call_sizes + [meta]
|
|
wrapper.generate_kernel_call(
|
|
name,
|
|
call_args,
|
|
grid=grid,
|
|
grid_fn=f"{self.grid_fn.__module__}.{self.grid_fn.__name__}",
|
|
arg_types=arg_types,
|
|
triton_meta=self.triton_meta,
|
|
gpu="cpu" not in V.graph.device_types,
|
|
)
|
|
|
|
if self.workspace_arg is not None:
|
|
wrapper.generate_workspace_deallocation(self.workspace_arg)
|
|
|
|
|
|
@functools.lru_cache(None)
|
|
def _jinja2_env():
|
|
try:
|
|
import jinja2
|
|
|
|
return jinja2.Environment(
|
|
undefined=jinja2.StrictUndefined,
|
|
)
|
|
except ImportError:
|
|
return None
|
|
|
|
|
|
class TritonTemplate(KernelTemplate):
|
|
index_counter = itertools.count()
|
|
all_templates: Dict[str, "TritonTemplate"] = {}
|
|
|
|
def __init__(self, name: str, grid: Any, source: str, debug=False) -> None:
|
|
super().__init__(name)
|
|
self.grid = grid
|
|
self.template = self._template_from_string(source)
|
|
assert name not in self.all_templates, "duplicate template name"
|
|
self.all_templates[name] = self
|
|
self.debug = debug
|
|
|
|
def generate( # type: ignore[override]
|
|
self,
|
|
input_nodes,
|
|
layout,
|
|
num_stages,
|
|
num_warps,
|
|
prefix_args=0,
|
|
suffix_args=0,
|
|
epilogue_fn=identity,
|
|
subgraphs=None,
|
|
mutated_inputs=None,
|
|
call_sizes=None,
|
|
workspace_arg: Optional[WorkspaceArg] = None,
|
|
**kwargs,
|
|
):
|
|
"""This function generates a TritonTemplateCaller
|
|
|
|
Args:
|
|
input_nodes: List of input nodes
|
|
layout: Output layout
|
|
num_stages: Number of stages for triton launch
|
|
num_warps: Number of warps for triton launch
|
|
prefix_args: Number of input nodes to be passed as arguments
|
|
suffix_args: Number of input nodes to be passed as arguments
|
|
epilogue_fn: Optional epilogue function to be called on the output
|
|
subgraphs: Optional subgraphs to be passed as arguments, these will be inlined
|
|
into the triton template string
|
|
mutated_inputs: Optional list of input nodes that are mutated by the kernel, this is helpful
|
|
if you need to return multiple outputs. You can pass them as inputs and mark them as
|
|
being mutated by the kernel.
|
|
"""
|
|
assert self.template, "requires jinja2"
|
|
defines = StringIO()
|
|
for name, val in kwargs.items():
|
|
defines.write(f"{name} : tl.constexpr = {val}\n")
|
|
defines = defines.getvalue()
|
|
|
|
fake_out = ir.Buffer(name="buf_out", layout=layout)
|
|
kernel_name = f"triton_{self.name}"
|
|
|
|
numel = sympy_product(layout.size)
|
|
buffers = itertools.chain(input_nodes, (fake_out,))
|
|
if not TritonScheduling.can_use_32bit_indexing(numel, buffers):
|
|
raise NotImplementedError(
|
|
"64-bit indexing is not yet implemented for triton templates"
|
|
)
|
|
|
|
if call_sizes is None:
|
|
call_sizes = layout.size
|
|
|
|
kernel_options = {
|
|
"input_nodes": input_nodes,
|
|
"defines": defines,
|
|
"num_stages": num_stages,
|
|
"num_warps": num_warps,
|
|
"grid_fn": self.grid,
|
|
"meta": kwargs,
|
|
"call_sizes": call_sizes,
|
|
"prefix_args": prefix_args,
|
|
"suffix_args": suffix_args,
|
|
"epilogue_fn": epilogue_fn,
|
|
"subgraphs": subgraphs,
|
|
}
|
|
|
|
with patch.object(
|
|
V.graph, "get_dtype", self._fake_get_dtype(fake_out)
|
|
), V.graph.set_current_device(layout.device), TritonTemplateKernel(
|
|
kernel_name=kernel_name,
|
|
output_node=fake_out,
|
|
workspace_arg=workspace_arg,
|
|
use_jit=False,
|
|
**kernel_options,
|
|
) as kernel:
|
|
try:
|
|
template = kernel.render(self.template, kwargs)
|
|
with kernel.set_subgraph_body("<STORE_OUTPUT>"):
|
|
code = template.finalize_all()
|
|
except ZeroDivisionError:
|
|
# TODO(nmacchioni): fix sympy division by zero
|
|
return None
|
|
if self.debug:
|
|
print("Generated Code:\n", code)
|
|
extra = (
|
|
"-".join(
|
|
[
|
|
*[
|
|
f"{kwarg}={repr(kwargs[kwarg])}"
|
|
for kwarg in sorted(kwargs.keys())
|
|
],
|
|
f"num_stages={num_stages}",
|
|
f"num_warps={num_warps}",
|
|
]
|
|
)
|
|
+ "-"
|
|
)
|
|
mod = PyCodeCache.load(code, extra)
|
|
|
|
input_call_args = tuple(kernel.args.input_buffers.keys())
|
|
|
|
# We expect the input_buffer order to be [*input_nodes, *captured_buffers]
|
|
expected_input_args = tuple(unique(x.get_name() for x in input_nodes))
|
|
assert input_call_args[: len(expected_input_args)] == expected_input_args, (
|
|
input_call_args,
|
|
expected_input_args,
|
|
)
|
|
|
|
full_input_nodes = tuple([V.graph.get_buffer(k) for k in input_call_args])
|
|
extra_args = V.graph.sizevars.size_hints(
|
|
map(sympy.expand, tuple(kernel.args.sizevars.keys())),
|
|
fallback=config.unbacked_symint_fallback,
|
|
)
|
|
|
|
kernel_hash_name = f"triton_{self.name}_{next(self.index_counter)}"
|
|
|
|
def make_kernel_render(out_node):
|
|
kernel = TritonTemplateKernel(
|
|
kernel_name=str(Placeholder.KERNEL_NAME),
|
|
output_node=out_node,
|
|
workspace_arg=workspace_arg,
|
|
use_jit=False,
|
|
**kernel_options,
|
|
)
|
|
render = functools.partial(
|
|
kernel.render,
|
|
self.template,
|
|
kwargs,
|
|
)
|
|
return kernel, render
|
|
|
|
# create the BenchmarkRequest
|
|
assert mod.__file__ is not None
|
|
grid = self.grid(
|
|
*V.graph.sizevars.size_hints(
|
|
call_sizes,
|
|
fallback=config.unbacked_symint_fallback,
|
|
),
|
|
kwargs,
|
|
)
|
|
bmreq_cls: Type[TritonBenchmarkRequest]
|
|
if layout.device.type == "cpu":
|
|
bmreq_cls = TritonCPUBenchmarkRequest
|
|
else:
|
|
bmreq_cls = TritonGPUBenchmarkRequest
|
|
bmreq = bmreq_cls(
|
|
module_path=mod.__file__,
|
|
module_cache_key=mod.key,
|
|
kernel_name=kernel_name,
|
|
grid=grid,
|
|
extra_args=extra_args,
|
|
num_stages=num_stages,
|
|
num_warps=num_warps,
|
|
matrix_instr_nonkdim=kwargs.get("matrix_instr_nonkdim", 0),
|
|
input_tensor_meta=TensorMeta.from_irnodes(full_input_nodes), # type: ignore[arg-type]
|
|
output_tensor_meta=TensorMeta.from_irnodes(layout),
|
|
workspace_arg=workspace_arg,
|
|
)
|
|
|
|
return TritonTemplateCaller(
|
|
kernel_hash_name,
|
|
full_input_nodes,
|
|
layout,
|
|
make_kernel_render,
|
|
extra.strip("-").replace("-", ", "),
|
|
bmreq,
|
|
log_info={
|
|
"tile_shape": str(
|
|
(
|
|
kwargs.get("BLOCK_M", -1),
|
|
kwargs.get("BLOCK_K", -1),
|
|
kwargs.get("BLOCK_N", -1),
|
|
)
|
|
),
|
|
"num_stages": num_stages,
|
|
"num_warps": num_warps,
|
|
"allow_tf32": str(kwargs.get("ALLOW_TF32", None)),
|
|
"acc_type": str(kwargs.get("ACC_TYPE", None)),
|
|
},
|
|
mutated_inputs=mutated_inputs,
|
|
workspace_arg=workspace_arg,
|
|
)
|
|
|
|
|
|
class ExternKernelChoice:
|
|
def __init__(
|
|
self,
|
|
kernel,
|
|
cpp_kernel=None,
|
|
*,
|
|
name=None,
|
|
has_out_variant=True,
|
|
op_overload=None,
|
|
use_fallback_kernel=False,
|
|
kernel_creator=None,
|
|
) -> None:
|
|
super().__init__()
|
|
name = name or kernel.__name__
|
|
assert callable(kernel)
|
|
assert not hasattr(extern_kernels, name), f"duplicate extern kernel: {name}"
|
|
self.name = name
|
|
self.cpp_kernel_name = cpp_kernel
|
|
self.has_out_variant = has_out_variant
|
|
setattr(extern_kernels, name, kernel)
|
|
self.op_overload = op_overload
|
|
self.use_fallback_kernel = use_fallback_kernel
|
|
self.kernel_creator = kernel_creator
|
|
|
|
def to_callable(self):
|
|
return getattr(extern_kernels, self.name)
|
|
|
|
def call_name(self):
|
|
return f"extern_kernels.{self.name}"
|
|
|
|
@functools.lru_cache(None) # noqa: B019
|
|
def hash_key(self):
|
|
fn = self.to_callable()
|
|
parts = [
|
|
self.name,
|
|
getattr(fn, "__name__", ""),
|
|
getattr(fn, "__module__", ""),
|
|
]
|
|
try:
|
|
parts.append(inspect.getsource(fn))
|
|
except Exception:
|
|
pass
|
|
return code_hash("-".join(parts))
|
|
|
|
def bind(
|
|
self,
|
|
input_nodes,
|
|
layout,
|
|
ordered_kwargs_for_cpp_kernel=(),
|
|
**kwargs,
|
|
):
|
|
self.ordered_kwargs_for_cpp_kernel = ordered_kwargs_for_cpp_kernel
|
|
return ExternKernelCaller(
|
|
self, input_nodes, layout, kwargs, has_out_variant=self.has_out_variant
|
|
)
|
|
|
|
|
|
class TritonTemplateCaller(ir.TritonTemplateCallerBase):
|
|
def __init__(
|
|
self,
|
|
name,
|
|
input_nodes,
|
|
layout,
|
|
make_kernel_render,
|
|
description,
|
|
bmreq,
|
|
log_info: Optional[
|
|
Dict[str, Union[PrimitiveInfoType, List[PrimitiveInfoType]]]
|
|
] = None,
|
|
mutated_inputs=None,
|
|
workspace_arg: Optional[WorkspaceArg] = None,
|
|
) -> None:
|
|
super().__init__(name, input_nodes, layout, description)
|
|
self.make_kernel_render = make_kernel_render
|
|
self.bmreq: TritonBenchmarkRequest = bmreq
|
|
if log_info is None:
|
|
log_info = {}
|
|
self.log_info: Dict[str, Any] = log_info
|
|
self.log_info.update(
|
|
{
|
|
"backend": "Triton",
|
|
"grid": str(self.bmreq.grid),
|
|
"num_stages": self.bmreq.num_stages,
|
|
"num_warps": self.bmreq.num_warps,
|
|
}
|
|
)
|
|
self.mutated_inputs = mutated_inputs
|
|
self.workspace_arg = workspace_arg
|
|
|
|
def benchmark(self, *args, out):
|
|
assert self.bmreq is not None
|
|
return self.bmreq.benchmark(*args, output_tensor=out)
|
|
|
|
def precompile(self):
|
|
assert self.bmreq is not None
|
|
self.bmreq.precompile()
|
|
|
|
def __str__(self) -> str:
|
|
return f"TritonTemplateCaller({self.bmreq.module_path}, {self.description})"
|
|
|
|
def call_name(self):
|
|
return f"template_kernels.{self.name}"
|
|
|
|
def hash_key(self):
|
|
return "-".join(
|
|
[
|
|
self.name.rsplit("_", 1)[0],
|
|
self.bmreq.module_cache_key,
|
|
]
|
|
)
|
|
|
|
def output_node(self):
|
|
return ir.TensorBox.create(
|
|
ir.TritonTemplateBuffer(
|
|
layout=self.layout,
|
|
inputs=self.input_nodes,
|
|
make_kernel_render=self.make_kernel_render,
|
|
mutated_inputs=self.mutated_inputs,
|
|
)
|
|
)
|
|
|
|
def info_dict(self) -> Dict[str, Union[PrimitiveInfoType, List[PrimitiveInfoType]]]:
|
|
"""Information returned here is logged to the autotune log file when that is enabled."""
|
|
return self.log_info
|
|
|
|
def get_make_kernel_render(self):
|
|
return self.make_kernel_render
|
|
|
|
def autoheuristic_id(self):
|
|
type_name = "triton"
|
|
info = self.info_dict()
|
|
# TODO(AlnisM): Does tile_shape always exist?
|
|
tile = info["tile_shape"]
|
|
tile_vals = eval(tile) # type: ignore[arg-type]
|
|
BLOCK_M = tile_vals[0]
|
|
BLOCK_K = tile_vals[1]
|
|
BLOCK_N = tile_vals[2]
|
|
num_stages = info["num_stages"]
|
|
num_warps = info["num_warps"]
|
|
return f"type={type_name}_BLOCK-M={BLOCK_M}_BLOCK-K={BLOCK_K}_BLOCK-N={BLOCK_N}_numstages={num_stages}_numwarps={num_warps}"
|
|
|
|
|
|
class ExternKernelCaller(ChoiceCaller):
|
|
def __init__(
|
|
self,
|
|
choice: ExternKernelChoice,
|
|
input_nodes,
|
|
layout,
|
|
kwargs=None,
|
|
*,
|
|
has_out_variant=True,
|
|
) -> None:
|
|
super().__init__(choice.name, input_nodes, layout, description="")
|
|
self.choice = choice
|
|
self.kwargs = kwargs or {}
|
|
self.has_out_variant = has_out_variant
|
|
|
|
def __str__(self) -> str:
|
|
return f"ExternKernelCaller({self.choice.call_name()})"
|
|
|
|
def benchmark(self, *args, out):
|
|
if out.numel() == 0:
|
|
# no need to run the kerrnel of do benchmarking
|
|
return 0.0
|
|
if self.has_out_variant:
|
|
return super().benchmark(*args, out=out)
|
|
else:
|
|
algo = self.to_callable()
|
|
out_new = algo(*args)
|
|
torch._C._dynamo.guards.assert_size_stride(
|
|
out_new, tuple(out.size()), tuple(out.stride())
|
|
)
|
|
out.copy_(out_new) # for correctness checking
|
|
return benchmarker.benchmark(algo, args, {})
|
|
|
|
def to_callable(self):
|
|
fn = self.choice.to_callable()
|
|
if self.kwargs:
|
|
return functools.partial(fn, **self.kwargs)
|
|
return fn
|
|
|
|
def hash_key(self):
|
|
return "-".join(
|
|
[
|
|
self.choice.name,
|
|
*[
|
|
f"{kwarg}={repr(self.kwargs[kwarg])}"
|
|
for kwarg in sorted(self.kwargs.keys())
|
|
],
|
|
self.choice.hash_key(),
|
|
]
|
|
)
|
|
|
|
def output_node(self):
|
|
if self.choice.use_fallback_kernel:
|
|
assert (
|
|
self.choice.op_overload is not None
|
|
), "Please provide an op_overload to use ir.FallbackKernel"
|
|
inner = ir.FallbackKernel.create(
|
|
self.choice.op_overload, *self.input_nodes, **self.kwargs
|
|
)
|
|
elif self.choice.kernel_creator is not None:
|
|
inner = self.choice.kernel_creator(*self.input_nodes, **self.kwargs)
|
|
else:
|
|
cls = ir.ExternKernelOut if self.has_out_variant else ir.ExternKernelAlloc
|
|
inner = cls(
|
|
layout=self.layout,
|
|
inputs=self.input_nodes,
|
|
python_kernel_name=self.choice.call_name(),
|
|
cpp_kernel_name=self.choice.cpp_kernel_name,
|
|
ordered_kwargs_for_cpp_kernel=self.choice.ordered_kwargs_for_cpp_kernel,
|
|
op_overload=self.choice.op_overload,
|
|
kwargs=self.kwargs,
|
|
)
|
|
|
|
return ir.TensorBox.create(inner)
|
|
|
|
def info_dict(self) -> Dict[str, Union[PrimitiveInfoType, List[PrimitiveInfoType]]]:
|
|
"""Information returned here is logged to the autotune log file when that is enabled."""
|
|
return {
|
|
"backend": "extern",
|
|
"kernel_call_name": self.choice.call_name(),
|
|
}
|
|
|
|
def autoheuristic_id(self):
|
|
return f"extern_{self.choice.name}"
|
|
|
|
|
|
@functools.lru_cache(None)
|
|
def get_mm_log_filename() -> Optional[str]:
|
|
mm_file_name = os.environ.get("TORCHINDUCTOR_MM_LOGGING_FILE", None)
|
|
if not mm_file_name:
|
|
return None
|
|
|
|
if "json" not in mm_file_name:
|
|
mm_file_name = f"{mm_file_name}.json"
|
|
|
|
return mm_file_name
|
|
|
|
|
|
def append_to_log(filename, data):
|
|
lock_file = filename.replace(".json", ".lock")
|
|
lock = FileLock(lock_file)
|
|
with lock:
|
|
try:
|
|
with open(filename) as f:
|
|
log_data = json.load(f)
|
|
except (FileNotFoundError, json.JSONDecodeError):
|
|
log_data = []
|
|
|
|
log_data.append(data)
|
|
|
|
with open(filename, "w") as f:
|
|
json.dump(log_data, f, indent=4)
|
|
|
|
|
|
class DataProcessorChoiceCallerWrapper:
|
|
def __init__(self, wrapped, preprocessor, postprocessor) -> None:
|
|
self._wrapped = wrapped
|
|
if preprocessor is not None:
|
|
self._preprocessor = preprocessor
|
|
else:
|
|
self._preprocessor = lambda x, y: (x, y)
|
|
if postprocessor is not None:
|
|
self._postprocessor = postprocessor
|
|
else:
|
|
self._postprocessor = lambda x: x
|
|
|
|
def __getattr__(self, name):
|
|
return getattr(self._wrapped, name)
|
|
|
|
def benchmark(self, *args, out) -> float:
|
|
new_args, new_out = self._preprocessor(args, out)
|
|
result = self._wrapped.benchmark(*new_args, out=new_out)
|
|
new_out = self._postprocessor(new_out)
|
|
if out is not new_out:
|
|
out.copy_(new_out)
|
|
return result
|
|
|
|
def output_node(self) -> ir.TensorBox:
|
|
result = self._wrapped.output_node()
|
|
return self._postprocessor(result)
|
|
|
|
def __repr__(self) -> str:
|
|
return f"DataProcessorChoiceCallerWrapper({self._wrapped})"
|
|
|
|
|
|
class DataProcessorTemplateWrapper:
|
|
"""
|
|
A wrapper class for a kernel template.
|
|
|
|
This class together with `DataProcessorChoiceCallerWrapper` provides a convenient way to
|
|
preprocess and postprocess data before and after using the wrapped template. A typical
|
|
usage is to reorder or filter the input nodes in order to match the expected input of other
|
|
kernel choices like a ATen kernel. A more complicated usage is to prepack the weights.
|
|
See the example from :mod:`cpp_gemm_template` for more details.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
wrapped_template_cls,
|
|
preprocessor,
|
|
postprocessor,
|
|
**kwargs,
|
|
) -> None:
|
|
if preprocessor is not None:
|
|
self._preprocessor = preprocessor
|
|
else:
|
|
self._preprocessor = lambda x, y: (x, y)
|
|
if postprocessor is not None:
|
|
self._postprocessor = postprocessor
|
|
else:
|
|
self._postprocessor = lambda x: x
|
|
assert "input_nodes" in kwargs
|
|
assert "layout" in kwargs
|
|
kwargs["input_nodes"], kwargs["layout"] = preprocessor(
|
|
kwargs["input_nodes"], kwargs["layout"]
|
|
)
|
|
self._wrapped = wrapped_template_cls(**kwargs)
|
|
|
|
def __getattr__(self, name):
|
|
return getattr(self._wrapped, name)
|
|
|
|
def maybe_append_choice(self, choices, **kwargs):
|
|
return type(self._wrapped).maybe_append_choice(self, choices, **kwargs)
|
|
|
|
def generate(self, **kwargs):
|
|
choice_caller = self._wrapped.generate(**kwargs)
|
|
return DataProcessorChoiceCallerWrapper(
|
|
choice_caller, self._preprocessor, self._postprocessor
|
|
)
|
|
|
|
def __repr__(self) -> str:
|
|
return f"DataProcessorTemplateWrapper({self._wrapped})"
|
|
|
|
|
|
class ErrorFromChoice(RuntimeError):
|
|
def __init__(self, msg, choice: ChoiceCaller, inputs_str) -> None:
|
|
msg += f"\nFrom choice {choice}\n{inputs_str}"
|
|
super().__init__(msg)
|
|
self.choice = choice
|
|
|
|
|
|
class NoValidChoicesError(RuntimeError):
|
|
pass
|
|
|
|
|
|
@functools.lru_cache(None)
|
|
def get_env_num_workers() -> Optional[int]:
|
|
if "TORCHINDUCTOR_COMPILE_THREADS" in os.environ:
|
|
return int(os.environ["TORCHINDUCTOR_COMPILE_THREADS"])
|
|
return None
|
|
|
|
|
|
def create_inputs_key(input_nodes) -> str:
|
|
return repr([AlgorithmSelectorCache.key_of(x) for x in input_nodes])
|
|
|
|
|
|
def create_precompile_key(
|
|
name: str, inputs_key: str, choices: List[ChoiceCaller]
|
|
) -> str:
|
|
return ":".join(
|
|
[
|
|
name,
|
|
inputs_key,
|
|
torch.get_float32_matmul_precision(),
|
|
]
|
|
+ [choice.hash_key() for choice in choices]
|
|
)
|
|
|
|
|
|
class AlgorithmSelectorCache(PersistentCache):
|
|
def __init__(self, *args, **kwargs) -> None:
|
|
super().__init__(*args, **kwargs)
|
|
|
|
# the autotuning will get occur in the scheduler, so there is
|
|
# no guarantee that the first lowering for a given key will also be the
|
|
# first to benchmark it. share a single precompilation function for all lowerings
|
|
# of a particular key
|
|
self.precompile_cache: Dict[str, Callable[[], None]] = {}
|
|
# list of callbacks that are called after benchmarking
|
|
self.feedback_saver_fns: List[
|
|
Callable[
|
|
[Dict[ChoiceCaller, float], str, List[Any], List[ChoiceCaller]], None
|
|
]
|
|
] = []
|
|
|
|
def __call__(
|
|
self,
|
|
name,
|
|
choices: List[ChoiceCaller],
|
|
input_nodes,
|
|
layout,
|
|
# optional dict mapping arg indices to the functions
|
|
# generating a torch.Tensor for that input from the
|
|
# corresponding ir.Buffer. if passed for a given
|
|
# arg, the function will be called instead of
|
|
# generating a random torch.Tensor for benchmarking.
|
|
input_gen_fns: Optional[Dict[int, Callable[[ir.Buffer], torch.Tensor]]] = None,
|
|
precompilation_timeout_seconds: int = 60 * 60,
|
|
return_multi_template=False,
|
|
):
|
|
from .codegen.cuda.cuda_kernel import CUDATemplateCaller
|
|
|
|
# Templates selected with input_gen_fns require specific input data to avoid IMA
|
|
# Passing custom input gen fns to benchmark_fusion NYI, so skip deferred template selection
|
|
# TODO(jgong5): support multi-template on CPU
|
|
if input_gen_fns is not None or layout.device.type == "cpu":
|
|
return_multi_template = False
|
|
|
|
# TODO - assert that we have not mutating kernels here
|
|
|
|
# TODO(nmacchioni): remove once CI tests are fixed
|
|
choices = [choice for choice in choices if choice is not None]
|
|
|
|
if mm_file_name := get_mm_log_filename():
|
|
M, K = input_nodes[-2].get_size()[:2]
|
|
N = input_nodes[-1].get_size()[-1]
|
|
append_to_log(mm_file_name, {"invoke": str((M, K, N))})
|
|
|
|
if len(choices) == 0:
|
|
backend_config = (
|
|
"max_autotune_gemm_backends"
|
|
if name != "convolution"
|
|
else "max_autotune_conv_backends"
|
|
)
|
|
raise NoValidChoicesError(
|
|
f"No choices to select, please consider adding ATEN into {backend_config} "
|
|
"config (defined in torch/_inductor/config.py) to allow at least one choice. "
|
|
)
|
|
log.debug("Max autotune selects from %s choices.", str(len(choices)))
|
|
|
|
if len(choices) == 1:
|
|
if not isinstance(choices[0], CUDATemplateCaller):
|
|
# CUDATemplateCaller still needs to go through autotuning process to retrieve workspace size.
|
|
return choices[0].output_node()
|
|
|
|
@functools.lru_cache(None)
|
|
def make_benchmark_fn():
|
|
return self.make_benchmark_fn(choices, input_nodes, layout, input_gen_fns)
|
|
|
|
inputs_key = create_inputs_key(input_nodes)
|
|
|
|
def precompile(choices) -> Callable[[], None]:
|
|
def no_op(*args, **kwargs):
|
|
return
|
|
|
|
if (
|
|
precompilation_timeout_seconds is None
|
|
or precompilation_timeout_seconds <= 0
|
|
):
|
|
return no_op
|
|
|
|
env_workers = get_env_num_workers()
|
|
num_workers = env_workers if env_workers is not None else (len(choices))
|
|
|
|
if num_workers <= 0:
|
|
return no_op
|
|
|
|
# https://github.com/python/cpython/issues/106905
|
|
if (
|
|
sys.version_info.major == 3
|
|
and sys.version_info.minor == 11
|
|
and sys.version_info.micro <= 8
|
|
):
|
|
return no_op
|
|
|
|
# check local and global cache before precompiling
|
|
timings = self.lookup(
|
|
choices,
|
|
name,
|
|
inputs_key,
|
|
benchmark=None,
|
|
)
|
|
|
|
if timings:
|
|
return no_op
|
|
|
|
if config.search_autotune_cache and not (
|
|
config.max_autotune or config.max_autotune_gemm
|
|
):
|
|
return no_op
|
|
|
|
precompile_key = create_precompile_key(name, inputs_key, choices)
|
|
if precompile_func := self.precompile_cache.get(precompile_key):
|
|
return precompile_func
|
|
|
|
log.info(
|
|
"Multithreaded precompilation for %d choices using %d worker threads",
|
|
len(choices),
|
|
num_workers,
|
|
)
|
|
|
|
# In rare circumstances, because python threads inherit global state,
|
|
# thread pool executor can race and leave stdout/stderr in a state
|
|
# different than the original values. we explicitly restore the state
|
|
# here to avoid this issue.
|
|
|
|
initial_stdout = sys.stdout
|
|
initial_stderr = sys.stderr
|
|
|
|
def precompile_with_captured_stdout(choice):
|
|
with restore_stdout_stderr(initial_stdout, initial_stderr):
|
|
start_time = time.time()
|
|
choice.precompile()
|
|
return time.time() - start_time
|
|
|
|
executor = ThreadPoolExecutor(max_workers=num_workers)
|
|
|
|
futures = {}
|
|
for c in choices:
|
|
if hasattr(c, "precompile"):
|
|
future = executor.submit(precompile_with_captured_stdout, c)
|
|
futures[future] = c
|
|
|
|
@functools.lru_cache(None)
|
|
@restore_stdout_stderr(initial_stdout, initial_stderr)
|
|
def wait_on_futures():
|
|
counters["inductor"]["select_algorithm_precompile"] += 1
|
|
for future in as_completed(
|
|
futures,
|
|
timeout=precompilation_timeout_seconds,
|
|
):
|
|
if e := future.exception():
|
|
log.error(
|
|
"Exception %s for benchmark choice %s", e, futures[future]
|
|
)
|
|
else:
|
|
log.info(
|
|
"Precompiling benchmark choice %s took %.02fs",
|
|
futures[future],
|
|
future.result(),
|
|
)
|
|
|
|
executor.shutdown(wait=True)
|
|
|
|
self.precompile_cache[precompile_key] = wait_on_futures
|
|
|
|
return wait_on_futures
|
|
|
|
def autotune(choices):
|
|
with dynamo_timed(f"{name}_template_autotuning"):
|
|
return make_benchmark_fn()(choices)
|
|
|
|
if config.autotune_in_subproc:
|
|
from .autotune_process import tuning_pool
|
|
|
|
# do the optional warmup
|
|
tuning_pool.initialize()
|
|
|
|
def do_autotuning(precompile_fn):
|
|
precompile_start_ts = time.time()
|
|
with dynamo_timed(f"{name}_template_precompiling"):
|
|
precompile_fn()
|
|
precompile_elapse = time.time() - precompile_start_ts
|
|
|
|
autotune_start_ts = time.time()
|
|
timings = self.lookup(
|
|
choices,
|
|
name,
|
|
inputs_key,
|
|
autotune,
|
|
)
|
|
autotune_elapse = time.time() - autotune_start_ts
|
|
|
|
if timings and all(
|
|
not math.isfinite(timing) for timing in timings.values()
|
|
):
|
|
raise NoValidChoicesError
|
|
|
|
if make_benchmark_fn.cache_info().currsize:
|
|
counters["inductor"]["select_algorithm_autotune"] += 1
|
|
|
|
if (
|
|
make_benchmark_fn.cache_info().currsize
|
|
or log.getEffectiveLevel() == logging.DEBUG
|
|
or config.trace.log_autotuning_results
|
|
):
|
|
self.log_results(
|
|
name, input_nodes, timings, autotune_elapse, precompile_elapse
|
|
)
|
|
|
|
for feedback_fn in self.feedback_saver_fns:
|
|
feedback_fn(timings, name, input_nodes, choices)
|
|
|
|
return timings
|
|
|
|
precompile_fn = precompile(choices)
|
|
|
|
if return_multi_template and (config.max_autotune or config.max_autotune_gemm):
|
|
|
|
def get_timings():
|
|
timings = do_autotuning(precompile_fn)
|
|
min_extern_choice = float("inf")
|
|
for choice, timing in timings.items():
|
|
if isinstance(choice, ExternKernelCaller):
|
|
min_extern_choice = min(min_extern_choice, timing)
|
|
|
|
timings = {
|
|
choice: time
|
|
for choice, time in timings.items()
|
|
if (
|
|
time <= min_extern_choice
|
|
or not isinstance(choice, ExternKernelCaller)
|
|
)
|
|
}
|
|
|
|
return timings
|
|
|
|
return torch._inductor.ir.TensorBox.create(
|
|
torch._inductor.ir.MultiTemplateBuffer(
|
|
layout,
|
|
input_nodes,
|
|
get_timings,
|
|
choices,
|
|
)
|
|
)
|
|
|
|
# TODO - dont want to precompile if we have a cache hit
|
|
timings = do_autotuning(precompile_fn)
|
|
if timings == {} or choices[0] not in timings:
|
|
return choices[0].output_node()
|
|
|
|
selected_key = builtins.min(timings, key=timings.__getitem__)
|
|
selected_time = timings[selected_key]
|
|
selected_choice = selected_key.output_node()
|
|
log.debug("selected choice: %s", str(selected_choice))
|
|
return selected_choice
|
|
|
|
@classmethod
|
|
def make_benchmark_fn(
|
|
cls,
|
|
choices,
|
|
input_nodes,
|
|
layout,
|
|
input_gen_fns=None,
|
|
):
|
|
if input_gen_fns is None:
|
|
input_gen_fns = {}
|
|
|
|
def get_inputs(
|
|
choices: Union[List[ExternKernelCaller], List[TritonTemplateCaller]]
|
|
) -> AutotuneArgs:
|
|
# de-duplicate args
|
|
unique_example_inputs = {
|
|
x.get_name(): input_gen_fns.get(i, cls.benchmark_example_value)(x)
|
|
for i, x in enumerate(input_nodes)
|
|
}
|
|
example_inputs = list(unique_example_inputs.values())
|
|
example_inputs_extern = [
|
|
(
|
|
unique_example_inputs[input_node.get_name()]
|
|
if unique_example_inputs[input_node.get_name()].is_mkldnn
|
|
else torch.as_strided(
|
|
unique_example_inputs[input_node.get_name()],
|
|
V.graph.sizevars.size_hints(
|
|
input_node.get_size(),
|
|
fallback=config.unbacked_symint_fallback,
|
|
),
|
|
V.graph.sizevars.size_hints(
|
|
input_node.get_stride(),
|
|
fallback=config.unbacked_symint_fallback,
|
|
),
|
|
V.graph.sizevars.size_hint(
|
|
input_node.get_layout().offset,
|
|
fallback=config.unbacked_symint_fallback,
|
|
),
|
|
)
|
|
)
|
|
for input_node in input_nodes
|
|
]
|
|
out = cls.benchmark_example_value(layout)
|
|
out_extern = torch.as_strided(
|
|
out, out.size(), out.stride(), V.graph.sizevars.size_hint(layout.offset)
|
|
)
|
|
expected = None
|
|
if VERIFY:
|
|
choices[0].benchmark(*example_inputs_extern, out=out_extern)
|
|
expected = out_extern.clone()
|
|
|
|
return AutotuneArgs.from_choice_args(
|
|
example_inputs,
|
|
example_inputs_extern,
|
|
out,
|
|
out_extern,
|
|
expected,
|
|
)
|
|
|
|
if DEBUG:
|
|
print(f"{len(choices)} tuning requests:")
|
|
|
|
def benchmark_choice_in_current_process(
|
|
choice: ChoiceCaller, autotune_args: AutotuneArgs
|
|
) -> float:
|
|
is_extern = isinstance(choice, ExternKernelCaller)
|
|
benchmark_tensors = autotune_args.get_benchmark_tensors(is_extern)
|
|
inpts, output = benchmark_tensors.unpack()
|
|
output.zero_()
|
|
result = choice.benchmark(*inpts, out=output)
|
|
if VERIFY and autotune_args.expected is not None:
|
|
autotune_args.verify(**VERIFY)
|
|
if torch.cuda.is_available():
|
|
torch.cuda.synchronize() # shake out any CUDA errors
|
|
return result
|
|
|
|
def benchmark_in_current_process(
|
|
choices: Union[List[ExternKernelCaller], List[TritonTemplateCaller]],
|
|
) -> Dict[Union[ExternKernelCaller, TritonTemplateCaller], float]:
|
|
inputs = get_inputs(choices)
|
|
timings = {}
|
|
for choice in choices:
|
|
try:
|
|
timing = benchmark_choice_in_current_process(choice, inputs)
|
|
except CUDACompileError as e:
|
|
log.error(
|
|
"CUDA compilation error during autotuning: \n%s. \nIgnoring this choice.",
|
|
str(e),
|
|
)
|
|
timing = float("inf")
|
|
except NotImplementedError as e:
|
|
log.warning("Not yet implemented: %s", e)
|
|
timing = float("inf")
|
|
except RuntimeError as e:
|
|
msg = str(e)
|
|
if "invalid argument" in msg:
|
|
msg += "\n\nThis may mean this GPU is too small for max_autotune mode.\n\n"
|
|
else:
|
|
if "illegal memory access" in msg:
|
|
msg += "\n\nEither error in template or triton bug.\n"
|
|
log.error(
|
|
"Runtime error during autotuning: \n%s. \nIgnoring this choice.",
|
|
msg,
|
|
)
|
|
timing = float("inf")
|
|
except AssertionError as e:
|
|
raise AssertionError( # noqa: B904
|
|
f"Incorrect result from choice {choice}\n\n{e}"
|
|
)
|
|
except Exception as e:
|
|
try:
|
|
from triton.runtime.autotuner import OutOfResources
|
|
|
|
if isinstance(e, OutOfResources):
|
|
log.warning(e)
|
|
timing = float("inf")
|
|
else:
|
|
raise e
|
|
except ImportError:
|
|
raise e from None
|
|
|
|
timings[choice] = timing
|
|
|
|
return timings
|
|
|
|
def benchmark_in_sub_process(
|
|
choices: Union[List[ExternKernelCaller], List[TritonTemplateCaller]]
|
|
):
|
|
from . import autotune_process
|
|
|
|
# only benchmark triton kernel in sub process for now.
|
|
# ATen/Extern kernel are still benchmarked in the current process.
|
|
extern = [c for c in choices if isinstance(c, ExternKernelCaller)]
|
|
triton = [c for c in choices if not isinstance(c, ExternKernelCaller)]
|
|
|
|
timings = benchmark_in_current_process(extern)
|
|
timings.update(autotune_process.benchmark_in_sub_process(triton)) # type: ignore[arg-type]
|
|
return timings
|
|
|
|
benchmark = (
|
|
benchmark_in_sub_process
|
|
if config.autotune_in_subproc
|
|
else benchmark_in_current_process
|
|
)
|
|
|
|
return benchmark
|
|
|
|
@staticmethod
|
|
def log_results(
|
|
name: str,
|
|
input_nodes: List[ir.IRNode],
|
|
timings: Dict[ChoiceCaller, float],
|
|
elapse: float,
|
|
precompile_elapse: float,
|
|
):
|
|
V.debug.log_autotuning_results(
|
|
name, input_nodes, timings, elapse, precompile_elapse
|
|
)
|
|
if not (config.max_autotune or config.max_autotune_gemm) or not PRINT_AUTOTUNE:
|
|
return
|
|
sizes = ", ".join(
|
|
[
|
|
"x".join(
|
|
map(
|
|
str,
|
|
V.graph.sizevars.size_hints(
|
|
n.get_size(), fallback=config.unbacked_symint_fallback # type: ignore[arg-type]
|
|
),
|
|
)
|
|
)
|
|
for n in input_nodes
|
|
]
|
|
)
|
|
if config.autotune_num_choices_displayed == 0:
|
|
return
|
|
elif config.autotune_num_choices_displayed is None:
|
|
n = -1
|
|
else:
|
|
n = config.autotune_num_choices_displayed
|
|
|
|
top_k = sorted(timings, key=timings.__getitem__)[:n]
|
|
|
|
best = top_k[0]
|
|
|
|
def get_choice_info(choice):
|
|
if isinstance(choice, torch._inductor.select_algorithm.ExternKernelCaller):
|
|
return {"type": "cublas", "time": timings[choice]}
|
|
|
|
assert isinstance(
|
|
choice, torch._inductor.select_algorithm.TritonTemplateCaller
|
|
)
|
|
|
|
info = choice.info_dict()
|
|
tile = info["tile_shape"]
|
|
|
|
tile_vals = eval(tile) # type: ignore[arg-type]
|
|
BLOCK_M = tile_vals[0]
|
|
BLOCK_K = tile_vals[1]
|
|
BLOCK_N = tile_vals[2]
|
|
|
|
return {
|
|
"type": "triton",
|
|
"time": timings[choice],
|
|
"BLOCK_M": BLOCK_M,
|
|
"BLOCK_K": BLOCK_K,
|
|
"BLOCK_N": BLOCK_N,
|
|
"num_stages": info["num_stages"],
|
|
"num_warps": info["num_warps"],
|
|
}
|
|
|
|
mm_filename = get_mm_log_filename()
|
|
if mm_filename and "mm" in name:
|
|
M, K = input_nodes[-2].get_size()[:2]
|
|
N = input_nodes[-1].get_size()[-1]
|
|
|
|
out_dict = {
|
|
str((M, K, N)): [get_choice_info(choice) for choice in timings.keys()]
|
|
}
|
|
|
|
append_to_log(mm_filename, out_dict)
|
|
|
|
best_time = timings[best]
|
|
sys.stderr.write(f"AUTOTUNE {name}({sizes})\n")
|
|
for choice in top_k:
|
|
result = timings[choice]
|
|
if result:
|
|
kernel_description = choice.description
|
|
sys.stderr.write(
|
|
f" {choice.name} {result:.4f} ms {best_time / result:.1%} {kernel_description}\n"
|
|
)
|
|
else:
|
|
sys.stderr.write(
|
|
f" {choice.name} {result:.4f} ms <DIVIDED BY ZERO ERROR>\n"
|
|
)
|
|
|
|
autotune_type_str = (
|
|
"SubProcess" if config.autotune_in_subproc else "SingleProcess"
|
|
)
|
|
sys.stderr.write(
|
|
f"{autotune_type_str} AUTOTUNE benchmarking takes {elapse:.4f} seconds and {precompile_elapse:.4f}"
|
|
f" seconds precompiling for {len(timings)} choices\n"
|
|
)
|
|
|
|
@staticmethod
|
|
def benchmark_example_value(node):
|
|
"""
|
|
Convert an ir.Buffer into a concrete torch.Tensor we can use for
|
|
benchmarking.
|
|
"""
|
|
if isinstance(node, ir.Layout):
|
|
node = ir.Buffer(name="fake", layout=node)
|
|
# triton templates want the base tensor.
|
|
if isinstance(node, ir.BaseView):
|
|
node = node.unwrap_view()
|
|
return AlgorithmSelectorCache.generate_example_value(
|
|
V.graph.sizevars.size_hints(
|
|
node.get_size(),
|
|
fallback=config.unbacked_symint_fallback,
|
|
),
|
|
V.graph.sizevars.size_hints(
|
|
node.get_stride(),
|
|
fallback=config.unbacked_symint_fallback,
|
|
),
|
|
node.get_device(),
|
|
node.get_dtype(),
|
|
node.layout.offset,
|
|
)
|
|
|
|
@staticmethod
|
|
def generate_example_value(size, stride, device, dtype, extra_size):
|
|
# preserve rng states to avoid the rand_strided call below changes
|
|
# the rng states for the real model code.
|
|
with preserve_rng_state():
|
|
return rand_strided(
|
|
size,
|
|
stride,
|
|
device=device,
|
|
dtype=dtype,
|
|
extra_size=extra_size,
|
|
)
|
|
|
|
@staticmethod
|
|
def key_of(node):
|
|
"""
|
|
Extract the pieces of an ir.Buffer that we should invalidate cached
|
|
autotuning results on.
|
|
"""
|
|
sizevars = V.graph.sizevars
|
|
return (
|
|
node.get_device().type,
|
|
str(node.get_dtype()),
|
|
*sizevars.size_hints(
|
|
node.get_size(),
|
|
fallback=config.unbacked_symint_fallback,
|
|
),
|
|
*sizevars.size_hints(
|
|
node.get_stride(),
|
|
fallback=config.unbacked_symint_fallback,
|
|
),
|
|
sizevars.size_hint(
|
|
node.get_layout().offset,
|
|
fallback=config.unbacked_symint_fallback,
|
|
),
|
|
)
|
|
|
|
def add_feedback_saver(
|
|
self,
|
|
fn: Callable[
|
|
[Dict[ChoiceCaller, float], str, List[Any], List[ChoiceCaller]], None
|
|
],
|
|
):
|
|
self.feedback_saver_fns.append(fn)
|
|
|
|
|
|
_ALGORITHM_SELECTOR_CACHE: Optional[AlgorithmSelectorCache] = None
|
|
|
|
|
|
def autotune_select_algorithm(*args, **kwargs):
|
|
global _ALGORITHM_SELECTOR_CACHE
|
|
if _ALGORITHM_SELECTOR_CACHE is None:
|
|
_ALGORITHM_SELECTOR_CACHE = AlgorithmSelectorCache()
|
|
|
|
if "return_multi_template" not in kwargs:
|
|
kwargs[
|
|
"return_multi_template"
|
|
] = torch._inductor.config.benchmark_epilogue_fusion
|
|
|
|
return _ALGORITHM_SELECTOR_CACHE(*args, **kwargs)
|
|
|
|
|
|
def add_feedback_saver(
|
|
fn: Callable[[Dict[ChoiceCaller, float], str, List[Any], List[ChoiceCaller]], None]
|
|
):
|
|
global _ALGORITHM_SELECTOR_CACHE
|
|
if _ALGORITHM_SELECTOR_CACHE is None:
|
|
_ALGORITHM_SELECTOR_CACHE = AlgorithmSelectorCache()
|
|
_ALGORITHM_SELECTOR_CACHE.add_feedback_saver(fn)
|
|
|
|
|
|
def realize_inputs(*args):
|
|
if len(args) == 1:
|
|
return ir.ExternKernel.require_stride1(ir.ExternKernel.realize_input(args[0]))
|
|
return [realize_inputs(x) for x in args]
|
|
|
|
|
|
# ensure lowering is imported so that `extern_kernels.*` is populated
|
|
from . import lowering # noqa: F401
|