[Graph Partition] Pass all OSS unit tests (#154667)

Graph partition leads to 6.2% speedup on vision_maskrcnn, 5.8% speedup on yolov3. [P1819700563](https://www.internalfb.com/phabricator/paste/view/P1819700563), 39.5% speedup on speech_transformer inference [P1830602200](https://www.internalfb.com/phabricator/paste/view/P1830602200), 85% speedup on speech_transformer training [P1831115315](https://www.internalfb.com/phabricator/paste/view/P1831115315).

Run the same diff on two days and both show speedup on average.

[first TorchInductor Benchmark ci run](https://hud.pytorch.org/benchmark/compilers?dashboard=torchinductor&startTime=Mon%2C%2021%20Jul%202025%2016%3A37%3A55%20GMT&stopTime=Mon%2C%2028%20Jul%202025%2016%3A37%3A55%20GMT&granularity=hour&mode=inference&dtype=bfloat16&deviceName=cuda%20(h100)&lBranch=bf/partition-turn-on&lCommit=75ef90fe89b82c967362a2d40fdf1af047202bc2&rBranch=main&rCommit=abcb24f4de11f8fedf2c2c9ff53b6092ef42306d)
<img width="1885" height="752" alt="image" src="https://github.com/user-attachments/assets/13bba9fc-5dbf-42ad-8558-d54f7e367b41" />

[second TorchInductorBenchmark ci run](https://hud.pytorch.org/benchmark/compilers?dashboard=torchinductor&startTime=Wed%2C%2023%20Jul%202025%2016%3A38%3A27%20GMT&stopTime=Wed%2C%2030%20Jul%202025%2016%3A38%3A27%20GMT&granularity=hour&mode=inference&dtype=bfloat16&deviceName=cuda%20(h100)&lBranch=bf/partition-turn-on&lCommit=66de27e29338c26b1be94733049868cb0309ea52&rBranch=main&rCommit=70d2e9ba455c3c910f6f95b24171c8eee7bc00bf)
<img width="2513" height="1030" alt="image" src="https://github.com/user-attachments/assets/3a413dcb-2314-4292-919a-7ca181f9eeac" />

Pull Request resolved: https://github.com/pytorch/pytorch/pull/154667
Approved by: https://github.com/eellison

test/inductor/test_compiled_autograd.py

@@ -3085,7 +3085,16 @@ main()
         self.assertEqual(counters["compiled_autograd"]["captures"], 1)
         # Compiled autograd lifts custom autograd.Function bwd instead of tracing it.
         # Must skip since we do not know if the cpu scalar will be used only in ATen/prim ops.
-        self.assertEqual(counters["inductor"]["cudagraph_skips"], 1)
+        if inductor_config.graph_partition:
+            # instead of skipping cudagraph, graph partition splits off cpu inputs/outputs and ops
+            # and cudagraphify the remaining computation. So there is no cudagraph skip.
+            expected_cudagraph_skips = 0
+        else:
+            expected_cudagraph_skips = 1
+
+        self.assertEqual(
+            counters["inductor"]["cudagraph_skips"], expected_cudagraph_skips
+        )
 
     @scoped_load_inline
     @requires_cuda_and_triton
@@ -3150,9 +3159,18 @@ TORCH_LIBRARY(test_cudagraphs_cpu_scalar_used_in_cpp_custom_op, m) {
         # into it. We must skip since we do not know if the cpu scalar will be used only in ATen/prim ops.
         # In the future, we can consider having a cpu scalar movement pass sometime after we trace
         # into the custom C++ autograd::Function (like in AOTDispatcher)
+        if inductor_config.graph_partition:
+            # instead of skipping cudagraph, graph partition splits off cpu inputs/outputs and ops
+            # and cudagraphify the remaining computation. So there is no cudagraph skip.
+            expected_cudagraph_skips = 0
+        elif inductor_config.cpp_wrapper:
+            expected_cudagraph_skips = 2
+        else:
+            expected_cudagraph_skips = 1
+
         self.assertEqual(
             counters["inductor"]["cudagraph_skips"],
-            2 if inductor_config.cpp_wrapper else 1,
+            expected_cudagraph_skips,
         )
 
     def test_logs(self):

test/inductor/test_control_flow.py

@@ -472,6 +472,9 @@ class CondTests(TestCase):
     @requires_gpu
     @parametrize("device", ["cpu", GPU_TYPE])
     @torch._inductor.config.patch(size_asserts=False)
+    # TODO: graph partition does not support creating tensor
+    # with dynamic shape in conditional subgraph yet
+    @torch._inductor.config.patch(graph_partition=False)
     def test_cond_unbacked_symint_inner(self, device):
         class Model(torch.nn.Module):
             def forward(self, p, a):

test/inductor/test_cuda_repro.py

@@ -189,9 +189,9 @@ class CudaReproTests(TestCase):
             # padded bias should have an expanded dim
             FileCheck().check("buf0 =").check_same(", 0, ").run(code[0])
             # single fused padded kernel
-            FileCheck().check("def call").check_count(
-                "empty_strided_cuda", 1, exactly=True
-            ).check("return").run(code[0])
+            FileCheck().check_count("empty_strided_cuda(", 1, exactly=True).check(
+                "return"
+            ).run(code[0])
 
             self.assertEqual(out, f(*inputs))
 

test/inductor/test_cudagraph_trees.py

@@ -279,6 +279,10 @@ if HAS_CUDA_AND_TRITON:
             with capture_stderr() as captured_output:
                 foo(torch.ones([10], device="cuda"), torch.ones([20]))
 
+            if torch._inductor.config.graph_partition:
+                # graph partition splits on cpu ops
+                self.assertEqual(counters["inductor"]["cudagraph_skips"], 0)
+            else:
                 FileCheck().check(
                     "skipping cudagraphs due to cpu device (arg1_1). Found from"
                 ).check("y + 2").run(captured_output[0])
@@ -292,7 +296,10 @@ if HAS_CUDA_AND_TRITON:
             FileCheck().check("skipping cudagraphs due to multiple devices").run(
                 captured_output[0]
             )
-            self.assertEqual(counters["inductor"]["cudagraph_skips"], 2)
+            self.assertEqual(
+                counters["inductor"]["cudagraph_skips"],
+                1 if torch._inductor.config.graph_partition else 2,
+            )
 
         @torch._inductor.config.patch("triton.cudagraph_skip_dynamic_graphs", True)
         def test_skip_symbolic(self):
@@ -807,6 +814,12 @@ if HAS_CUDA_AND_TRITON:
             # the three saved tensors should die in the backward
             # we kept alive the output
             self.assertEqual(self.curr_node().expected_dead_indices_before_graph, [])
+            if torch._inductor.config.graph_partition:
+                self.assertEqual(
+                    self.curr_node().expected_dead_indices_after_graph,
+                    [(0, 0), (0, 2)],
+                )
+            else:
                 self.assertEqual(
                     self.curr_node().expected_dead_indices_after_graph,
                     [(0, 1), (0, 2)],
@@ -1127,6 +1140,11 @@ if HAS_CUDA_AND_TRITON:
 
             node = self.curr_node()
             first_node = next(node._path_from_root)
+            if torch._inductor.config.graph_partition:
+                # graph partition may changed the order of outputs
+                self.assertFalse(first_node.unaliased_in_all_paths[1])
+                self.assertTrue(first_node.cached_tensor_outputs[1] is None)
+            else:
                 self.assertFalse(first_node.unaliased_in_all_paths[0])
                 self.assertTrue(first_node.cached_tensor_outputs[0] is None)
 
@@ -1631,6 +1649,12 @@ if HAS_CUDA_AND_TRITON:
             # the three saved tensors should die in the backward
             # we kept alive the output
             self.assertEqual(self.curr_node().expected_dead_indices_before_graph, [])
+            if torch._inductor.config.graph_partition:
+                self.assertEqual(
+                    self.curr_node().expected_dead_indices_after_graph,
+                    [(0, 0), (0, 2)],
+                )
+            else:
                 self.assertEqual(
                     self.curr_node().expected_dead_indices_after_graph,
                     [(0, 1), (0, 2)],
@@ -2137,8 +2161,8 @@ if HAS_CUDA_AND_TRITON:
             with self.assertRaisesRegex(
                 Exception,
                 r"(?s)static input data pointer changed.\n"
-                r"input name: primals_2. data pointer changed from .* to .*. input stack trace:.*"
-                r"input name: primals_3. data pointer changed from .* to .*. input stack trace:.*,"
+                r"input name: primals_.*. data pointer changed from .* to .*. input stack trace:.*"
+                r"input name: primals_.*. data pointer changed from .* to .*. input stack trace:.*,"
                 r" in forward\n.* self.static_tensor.add\_\(torch.ones\(\(2, 2\), device=\"cuda\"\)\).*\n",
             ):
                 self.curr_node().run(
@@ -3551,6 +3575,278 @@ if HAS_CUDA_AND_TRITON:
 
             self.assertEqual(self.get_manager().new_graph_id().id, 2)
 
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_simple(self):
+            def f(x, y):
+                x1 = x + 1
+                y1 = y + 1
+                y_cpu = y1.cpu() + 1
+                z = x @ y
+                return x1 + y1 + z + y_cpu.to("cuda")
+
+            x, y = [torch.ones(2, 2, device="cuda") for _ in range(2)]
+            x_cloned, y_cloned = [tmp.clone() for tmp in [x, y]]
+            eager_out = f(x, y)
+
+            f_compiled = torch.compile(f)
+            compiled_out = f_compiled(x_cloned, y_cloned)
+            self.assertEqual(eager_out, compiled_out)
+
+            _, code = run_and_get_code(f_compiled, x_cloned, y_cloned)
+
+            if not config.cpp_wrapper:
+                FileCheck().check("def partition_0(args):").check(
+                    "recursively_apply_fns = runner.recursively_apply_fns"
+                ).run(code[0])
+
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_foreach_op(self):
+            def fn(a0, a1):
+                c = torch._foreach_abs([a0, a1])
+                return torch.mul(c[0], a0)
+
+            compiled_fn = torch.compile(fn)
+
+            a0 = torch.randn(2, 3, device="cuda")
+            a1 = torch.randn(2, 3, device="cuda")
+            eager_out = fn(a0, a1)
+            compiled_out = compiled_fn(a0, a1)
+            self.assertEqual(eager_out, compiled_out)
+
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_condition_op(self):
+            def f(p, b):
+                def true_fn(x):
+                    return torch.cos(x)
+
+                def false_fn(x):
+                    return torch.sin(x)
+
+                return torch.cond(p, true_fn, false_fn, [b])
+
+            compiled_f = torch.compile(f)
+
+            # static shape
+            p = torch.tensor([True], device="cuda")
+            a = torch.ones([2, 3], device="cuda")
+            eager_out = f(p, a)
+            compiled_out = compiled_f(p, a)
+            self.assertEqual(eager_out, compiled_out)
+
+            # dynamic shape with backed symint
+            p = torch.tensor([True], device="cuda")
+            a = torch.ones([4, 5], device="cuda")
+            eager_out = f(p, a)
+            compiled_out = compiled_f(p, a)
+            self.assertEqual(eager_out, compiled_out)
+
+        @torch._inductor.config.patch("graph_partition", True)
+        @torch._dynamo.config.patch("capture_scalar_outputs", True)
+        def test_graph_partition_unbacked_symint_multi_output_layout(self):
+            def f(p, size_tensor):
+                size_val = size_tensor.item()
+                b = torch.ones([size_val, 3], device="cuda")
+
+                def true_fn(x):
+                    return torch.cos(x), torch.cos(x) + 1
+
+                def false_fn(x):
+                    return torch.sin(x), torch.sin(x) + 1
+
+                cond_out = torch.cond(p, true_fn, false_fn, [b])
+                return cond_out[0] + cond_out[1]
+
+            compiled_f = torch.compile(f)
+            p = torch.tensor([True], device="cuda")
+            size_tensor = torch.tensor(2, device="cuda")
+            eager_out = f(p, size_tensor)
+            compiled_out = compiled_f(p, size_tensor)
+            self.assertEqual(eager_out, compiled_out)
+
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_symint(self):
+            def f(x, y):
+                x1 = x + 1
+                y1 = y + 1
+                y_cpu = y1.cpu() + 1
+                z = x @ y
+                return x1 + y1 + z + y_cpu.to("cuda")
+
+            f_compiled = torch.compile(f)
+            x, y = (
+                torch.ones(3, 3, device="cuda"),
+                torch.randn(3, 3, device="cuda"),
+            )
+            compiled_out = f_compiled(x, y)
+            self.assertEqual(compiled_out, f(x, y))
+
+            x, y = (
+                torch.ones(4, 4, device="cuda"),
+                torch.randn(4, 4, device="cuda"),
+            )
+            compiled_out = f_compiled(x, y)
+            self.assertEqual(compiled_out, f(x, y))
+
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_symint_cat_backward(self):
+            def f(x, w):
+                y = torch.cat((x, x), dim=0)
+                z = y @ w
+                return z @ z.T
+
+            compiled_f = torch.compile(f)
+
+            for shape in (2, 3):
+                torch.manual_seed(42)
+                eager_x = torch.randn(shape, 2, device="cuda")
+                eager_w = torch.randn(2, 2, device="cuda", requires_grad=True)
+                torch.manual_seed(42)
+                compiled_x = torch.randn(shape, 2, device="cuda")
+                compiled_w = torch.randn(2, 2, device="cuda", requires_grad=True)
+
+                f(eager_x, eager_w).sum().backward()
+                compiled_f(compiled_x, compiled_w).sum().backward()
+                self.assertEqual(eager_w.grad, compiled_w.grad)
+
+        @dynamo_config.patch("capture_dynamic_output_shape_ops", True)
+        @config.patch(implicit_fallbacks=True)
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_symint_from_nested_indirect_indexing(self):
+            def nested(x, repeats):
+                rank = torch.arange(repeats.numel(), device=x.device)
+                index = rank.repeat_interleave(repeats, dim=0)
+                return torch.index_select(x, index=index, dim=0)
+
+            example_inputs = (
+                torch.randn((32, 64), device="cuda"),
+                repeats := torch.tensor([5, 10, 15], device="cuda"),
+            )
+            torch._dynamo.mark_dynamic(repeats, 0)  # create backed symint
+
+            nested_opt = torch.compile(nested, backend="inductor")
+
+            expect = nested(*example_inputs)
+            actual = nested_opt(*example_inputs)
+            self.assertEqual(expect, actual)
+
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_symint_from_mutation_index(self):
+            x = torch.zeros(7, device="cuda")
+
+            def fn(n, a):
+                a[n] = -1
+                return a
+
+            opt_fn = torch.compile(fn, fullgraph=True)
+
+            for n in range(2, x.shape[0]):
+                opt_fn(n, x)
+                self.assertEqual(x[n], -1)
+
+            # Negative index triggers new compilation.
+            opt_fn(-x.shape[0], x)
+
+            self.assertEqual(x[0], -1)
+
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_unbacked_symint(self):
+            def f(x, y):
+                x1 = x + 1
+                y1 = y + 1
+                y_cpu = y1.cpu() + 1
+                z = x @ y
+                return x1 + y1 + z + y_cpu.to("cuda")
+
+            f_compiled = torch.compile(f)
+            x, y = (
+                torch.ones(3, 3, device="cuda"),
+                torch.randn(3, 3, device="cuda"),
+            )
+
+            torch._dynamo.decorators.mark_unbacked(x, 0)
+            torch._dynamo.decorators.mark_unbacked(y, 1)
+
+            compiled_out = f_compiled(x, y)
+            eager_out = f(x, y)
+            self.assertEqual(compiled_out, eager_out)
+
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_dynamic_scalar_inputs(self):
+            def f(x, y, integer):
+                x1 = x + 1
+                y1 = y + 1
+                y_cpu = y1.cpu() + 1
+                z = x @ y
+                z += integer
+                return x1 + y1 + z + y_cpu.to("cuda")
+
+            f_compiled = torch.compile(f)
+            x, y = (
+                torch.ones(3, 3, device="cuda"),
+                torch.randn(3, 3, device="cuda"),
+            )
+
+            torch._dynamo.decorators.mark_unbacked(x, 0)
+            torch._dynamo.decorators.mark_unbacked(y, 1)
+
+            compiled_out = f_compiled(x, y, 5)
+            self.assertEqual(compiled_out, f(x, y, 5))
+
+            compiled_out = f_compiled(x, y, 6)
+            self.assertEqual(compiled_out, f(x, y, 6))
+
+        @torch._inductor.config.patch("graph_partition", True)
+        @torch._dynamo.config.patch("capture_scalar_outputs", True)
+        def test_graph_partition_item(self):
+            def f(x):
+                y = x + 1
+                scalar = y.item()
+                return x + y + scalar
+
+            compiled_f = torch.compile(f)
+            compiled_out = compiled_f(torch.tensor(1, device="cuda"))
+            self.assertEqual(compiled_out, f(torch.tensor(1, device="cuda")))
+
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_buffer_reuse(self):
+            def f(x, y):
+                x1 = x + 1
+                y1 = y + 1
+                y_cpu = y1.cpu() + 1
+                z = x1 + y1 + x @ y
+                u = (y_cpu.to("cuda") + 2) @ y + 3
+                u_cpu = u.cpu() + 2
+                return z + u_cpu.to("cuda")
+
+            x, y = [torch.ones(2, 2, device="cuda") for _ in range(2)]
+            x_cloned, y_cloned = [tmp.clone() for tmp in [x, y]]
+            eager_out = f(x, y)
+
+            f_compiled = torch.compile(f)
+            compiled_out = f_compiled(x_cloned, y_cloned)
+
+            self.assertEqual(eager_out, compiled_out)
+
+        @torch._inductor.config.patch("graph_partition", True)
+        def test_graph_partition_fused_scheduler_node(self):
+            def foo(x):
+                x = x * 20
+                x_alias = x[0]
+                y = x * 10
+                y_alias = y[0]
+                torch._dynamo.graph_break()
+                ind = torch.tensor(4, device="cuda")
+                x_alias2 = x[ind:]
+                y_alias2 = y[ind:]
+                return x, x_alias, x_alias2, y_alias, y_alias2
+
+            compiled_foo = torch.compile(foo)
+            x = torch.rand([20, 20], device="cuda")
+
+            eager_out = foo(x)
+            compiled_out = compiled_foo(x)
+            self.assertEqual(eager_out, compiled_out)
+
         def test_meta_tensor(self):
             def foobar(x, y):
                 return x * 2, y * 3

test/inductor/test_inductor_annotations.py

@@ -31,10 +31,11 @@ class InductorAnnotationTestCase(TestCase):
         code = self.get_code()
 
         self.assertTrue("from torch.cuda import nvtx" in code)
-        self.assertEqual(
-            code.count("training_annotation = nvtx._device_range_start('inference')"), 1
+        self.assertTrue(
+            code.count("training_annotation = nvtx._device_range_start('inference')")
+            >= 1
         )
-        self.assertEqual(code.count("nvtx._device_range_end(training_annotation)"), 1)
+        self.assertTrue(code.count("nvtx._device_range_end(training_annotation)") >= 1)
 
 
 if __name__ == "__main__":

test/inductor/test_memory.py

@@ -68,9 +68,16 @@ class TestOperatorReorderForPeakMemory(TestCase):
         outp_corr = self.model(self.inputs)
         compiled_model = torch.compile(self.model)
         code = run_and_get_triton_code(compiled_model, self.inputs)
+
+        call_str = (
+            "def call(self, args):"
+            if torch._inductor.config.graph_partition
+            else "def call(args):"
+        )
+
         (
             FileCheck()
-            .check("def call(args):")
+            .check(call_str)
             .check("buf1 = ")
             .check("buf0 = ")
             .check("buf2 = ")
@@ -105,6 +112,12 @@ class TestOperatorReorderForPeakMemory(TestCase):
                 methods=[memory.topological_sort_lpmf],
             )
 
+        call_str = (
+            "def call(self, args):"
+            if torch._inductor.config.graph_partition
+            else "def call(args):"
+        )
+
         with mock.patch.object(
             memory, "reorder_for_peak_memory", reorder_with_only_lpmf
         ):
@@ -113,7 +126,7 @@ class TestOperatorReorderForPeakMemory(TestCase):
             code = run_and_get_triton_code(compiled_model, self.inputs)
             (
                 FileCheck()
-                .check("def call(args):")
+                .check(call_str)
                 .check("buf1 = ")
                 .check("buf0 = ")
                 .check("buf2 = ")
@@ -148,15 +161,22 @@ class TestOperatorReorderForPeakMemory(TestCase):
                 methods=[memory.topological_sort_bfs],
             )
 
+        call_str = (
+            "def call(self, args):"
+            if torch._inductor.config.graph_partition
+            else "def call(args):"
+        )
+
         with mock.patch.object(
             memory, "reorder_for_peak_memory", reorder_with_only_bfs
         ):
             compiled_model = torch.compile(self.model)
 
             code = run_and_get_triton_code(compiled_model, self.inputs)
+
             (
                 FileCheck()
-                .check("def call(args):")
+                .check(call_str)
                 .check("buf0 = ")
                 .check("buf1 = ")
                 .check("buf2 = ")
@@ -191,6 +211,12 @@ class TestOperatorReorderForPeakMemory(TestCase):
                 methods=[memory.topological_sort_dfs],
             )
 
+        call_str = (
+            "def call(self, args):"
+            if torch._inductor.config.graph_partition
+            else "def call(args):"
+        )
+
         with mock.patch.object(
             memory, "reorder_for_peak_memory", reorder_with_only_dfs
         ):
@@ -199,7 +225,7 @@ class TestOperatorReorderForPeakMemory(TestCase):
             code = run_and_get_triton_code(compiled_model, self.inputs)
             (
                 FileCheck()
-                .check("def call(args):")
+                .check(call_str)
                 .check("buf0 = ")
                 .check("buf2 = ")
                 .check("buf4 = ")

test/inductor/test_torchinductor.py

@@ -15044,302 +15044,6 @@ if RUN_GPU:
                 "'XBLOCK': 'constexpr'"
             ).run(code[0])
 
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition(self):
-            def f(x, y):
-                x1 = x + 1
-                y1 = y + 1
-                y_cpu = y1.cpu() + 1
-                z = x @ y
-                return x1 + y1 + z + y_cpu.to(GPU_TYPE)
-
-            x, y = [torch.ones(2, 2, device=self.device) for _ in range(2)]
-            x_cloned, y_cloned = [tmp.clone() for tmp in [x, y]]
-            eager_out = f(x, y)
-
-            f_compiled = torch.compile(f)
-            compiled_out = f_compiled(x_cloned, y_cloned)
-            self.assertEqual(eager_out, compiled_out)
-
-            _, code = run_and_get_code(f_compiled, x_cloned, y_cloned)
-
-            if not config.cpp_wrapper:
-                FileCheck().check("def partition_0(args):").check(
-                    "(buf0, buf1, arg0_1, arg1_1) = self.partitions[0](partition0_args)"
-                ).check("recursively_apply_fns = runner.recursively_apply_fns").run(
-                    code[0]
-                )
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_foreach_op(self):
-            def fn(a0, a1):
-                c = torch._foreach_abs([a0, a1])
-                return torch.mul(c[0], a0)
-
-            compiled_fn = torch.compile(fn)
-
-            a0 = torch.randn(2, 3, device=self.device)
-            a1 = torch.randn(2, 3, device=self.device)
-            eager_out = fn(a0, a1)
-            compiled_out = compiled_fn(a0, a1)
-            self.assertEqual(eager_out, compiled_out)
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_multiple_functions(self):
-            def f(x, y):
-                x1 = x + 1
-                y1 = y + 1
-                y_cpu = y1.cpu() + 1
-                z = x @ y
-                return x1 + y1 + z + y_cpu.to(GPU_TYPE)
-
-            def g(x):
-                return x + 1
-
-            x, y = [torch.ones(2, 2, device=self.device) for _ in range(2)]
-            x_cloned, y_cloned = [tmp.clone() for tmp in [x, y]]
-            eager_out = g(f(x, y))
-
-            f_compiled = torch.compile(f)
-            g_compiled = torch.compile(g)
-            compiled_out = g_compiled(f_compiled(x_cloned, y_cloned))
-
-            self.assertEqual(eager_out, compiled_out)
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_condition_op(self):
-            def f(p, b):
-                def true_fn(x):
-                    return torch.cos(x)
-
-                def false_fn(x):
-                    return torch.sin(x)
-
-                return torch.cond(p, true_fn, false_fn, [b])
-
-            compiled_f = torch.compile(f)
-
-            # static shape
-            p = torch.tensor([True], device=self.device)
-            a = torch.ones([2, 3], device=self.device)
-            eager_out = f(p, a)
-            compiled_out = compiled_f(p, a)
-            self.assertEqual(eager_out, compiled_out)
-
-            # dynamic shape with backed symint
-            p = torch.tensor([True], device=self.device)
-            a = torch.ones([4, 5], device=self.device)
-            eager_out = f(p, a)
-            compiled_out = compiled_f(p, a)
-            self.assertEqual(eager_out, compiled_out)
-
-        @torch._inductor.config.patch("graph_partition", True)
-        @torch._dynamo.config.patch("capture_scalar_outputs", True)
-        def test_graph_partition_unbacked_symint_multi_output_layout(self):
-            def f(p, size_tensor):
-                size_val = size_tensor.item()
-                b = torch.ones([size_val, 3], device=GPU_TYPE)
-
-                def true_fn(x):
-                    return torch.cos(x), torch.cos(x) + 1
-
-                def false_fn(x):
-                    return torch.sin(x), torch.sin(x) + 1
-
-                cond_out = torch.cond(p, true_fn, false_fn, [b])
-                return cond_out[0] + cond_out[1]
-
-            compiled_f = torch.compile(f)
-            p = torch.tensor([True], device=GPU_TYPE)
-            size_tensor = torch.tensor(2, device=GPU_TYPE)
-            eager_out = f(p, size_tensor)
-            compiled_out = compiled_f(p, size_tensor)
-            self.assertEqual(eager_out, compiled_out)
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_symint(self):
-            def f(x, y):
-                x1 = x + 1
-                y1 = y + 1
-                y_cpu = y1.cpu() + 1
-                z = x @ y
-                return x1 + y1 + z + y_cpu.to(GPU_TYPE)
-
-            f_compiled = torch.compile(f)
-            x, y = (
-                torch.ones(3, 3, device=self.device),
-                torch.randn(3, 3, device=self.device),
-            )
-            compiled_out = f_compiled(x, y)
-            self.assertEqual(compiled_out, f(x, y))
-
-            x, y = (
-                torch.ones(4, 4, device=self.device),
-                torch.randn(4, 4, device=self.device),
-            )
-            compiled_out = f_compiled(x, y)
-            self.assertEqual(compiled_out, f(x, y))
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_symint_cat_backward(self):
-            def f(x, w):
-                y = torch.cat((x, x), dim=0)
-                z = y @ w
-                return z @ z.T
-
-            compiled_f = torch.compile(f)
-
-            for shape in (2, 3):
-                torch.manual_seed(42)
-                eager_x = torch.randn(shape, 2, device=self.device)
-                eager_w = torch.randn(2, 2, device=self.device, requires_grad=True)
-                torch.manual_seed(42)
-                compiled_x = torch.randn(shape, 2, device=self.device)
-                compiled_w = torch.randn(2, 2, device=self.device, requires_grad=True)
-
-                f(eager_x, eager_w).sum().backward()
-                compiled_f(compiled_x, compiled_w).sum().backward()
-                self.assertEqual(eager_w.grad, compiled_w.grad)
-
-        @dynamo_config.patch("capture_dynamic_output_shape_ops", True)
-        @config.patch(implicit_fallbacks=True)
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_symint_from_nested_indirect_indexing(self):
-            def nested(x, repeats):
-                rank = torch.arange(repeats.numel(), device=x.device)
-                index = rank.repeat_interleave(repeats, dim=0)
-                return torch.index_select(x, index=index, dim=0)
-
-            example_inputs = (
-                torch.randn((32, 64), device=self.device),
-                repeats := torch.tensor([5, 10, 15], device=self.device),
-            )
-            torch._dynamo.mark_dynamic(repeats, 0)  # create backed symint
-
-            nested_opt = torch.compile(nested, backend="inductor")
-
-            expect = nested(*example_inputs)
-            actual = nested_opt(*example_inputs)
-            self.assertEqual(expect, actual)
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_symint_from_mutation_index(self):
-            x = torch.zeros(7, device=GPU_TYPE)
-
-            def fn(n, a):
-                a[n] = -1
-                return a
-
-            opt_fn = torch.compile(fn, fullgraph=True)
-
-            for n in range(2, x.shape[0]):
-                opt_fn(n, x)
-                self.assertEqual(x[n], -1)
-
-            # Negative index triggers new compilation.
-            opt_fn(-x.shape[0], x)
-
-            self.assertEqual(x[0], -1)
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_unbacked_symint(self):
-            def f(x, y):
-                x1 = x + 1
-                y1 = y + 1
-                y_cpu = y1.cpu() + 1
-                z = x @ y
-                return x1 + y1 + z + y_cpu.to(GPU_TYPE)
-
-            f_compiled = torch.compile(f)
-            x, y = (
-                torch.ones(3, 3, device=self.device),
-                torch.randn(3, 3, device=self.device),
-            )
-
-            torch._dynamo.decorators.mark_unbacked(x, 0)
-            torch._dynamo.decorators.mark_unbacked(y, 1)
-
-            compiled_out = f_compiled(x, y)
-            eager_out = f(x, y)
-            self.assertEqual(compiled_out, eager_out)
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_dynamic_scalar_inputs(self):
-            def f(x, y, integer):
-                x1 = x + 1
-                y1 = y + 1
-                y_cpu = y1.cpu() + 1
-                z = x @ y
-                z += integer
-                return x1 + y1 + z + y_cpu.to(GPU_TYPE)
-
-            f_compiled = torch.compile(f)
-            x, y = (
-                torch.ones(3, 3, device=self.device),
-                torch.randn(3, 3, device=self.device),
-            )
-
-            torch._dynamo.decorators.mark_unbacked(x, 0)
-            torch._dynamo.decorators.mark_unbacked(y, 1)
-
-            compiled_out = f_compiled(x, y, 5)
-            self.assertEqual(compiled_out, f(x, y, 5))
-
-            compiled_out = f_compiled(x, y, 6)
-            self.assertEqual(compiled_out, f(x, y, 6))
-
-        @torch._inductor.config.patch("graph_partition", True)
-        @torch._dynamo.config.patch("capture_scalar_outputs", True)
-        def test_graph_partition_item(self):
-            def f(x):
-                y = x + 1
-                scalar = y.item()
-                return x + y + scalar
-
-            compiled_f = torch.compile(f)
-            compiled_out = f(torch.tensor(1, device=GPU_TYPE))
-            self.assertEqual(compiled_out, f(torch.tensor(1, device=GPU_TYPE)))
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_buffer_reuse(self):
-            def f(x, y):
-                x1 = x + 1
-                y1 = y + 1
-                y_cpu = y1.cpu() + 1
-                z = x1 + y1 + x @ y
-                u = (y_cpu.to(GPU_TYPE) + 2) @ y + 3
-                u_cpu = u.cpu() + 2
-                return z + u_cpu.to(GPU_TYPE)
-
-            x, y = [torch.ones(2, 2, device=GPU_TYPE) for _ in range(2)]
-            x_cloned, y_cloned = [tmp.clone() for tmp in [x, y]]
-            eager_out = f(x, y)
-
-            f_compiled = torch.compile(f)
-            compiled_out = f_compiled(x_cloned, y_cloned)
-
-            self.assertEqual(eager_out, compiled_out)
-
-        @torch._inductor.config.patch("graph_partition", True)
-        def test_graph_partition_fused_scheduler_node(self):
-            def foo(x):
-                x = x * 20
-                x_alias = x[0]
-                y = x * 10
-                y_alias = y[0]
-                torch._dynamo.graph_break()
-                ind = torch.tensor(4, device=GPU_TYPE)
-                x_alias2 = x[ind:]
-                y_alias2 = y[ind:]
-                return x, x_alias, x_alias2, y_alias, y_alias2
-
-            foo = torch.compile(foo)
-            x = torch.rand([20, 20], device=GPU_TYPE)
-            _, code = run_and_get_code(foo, x)
-
-            if not config.cpp_wrapper:
-                FileCheck().check("def partition_0(args):").run(code[0])
-
         @unittest.skipIf(TEST_WITH_ROCM or not IS_SM90, "no scaled_grouped_mm support")
         def test_respect_scaled_grouped_mm_layout_tag(self):
             # scaled_grouped_mm needs `mat2` to be column-major

torch/_inductor/codegen/wrapper.py

@@ -50,6 +50,7 @@ from ..utils import (
     get_benchmark_name,
     IndentedBuffer,
     is_codegen_graph_partition_subgraph,
+    is_using_cudagraph_partition,
     LineContext,
     sympy_product,
     sympy_str,
@@ -1197,6 +1198,13 @@ class PythonWrapperCodegen(CodeGen):
                 self.write_args(graph_input_names)
 
             self.codegen_inputs()
+
+            # avoid duplicating asserts for both partition functions and
+            # the call function when using cudagraph partition
+            if not (
+                is_using_cudagraph_partition()
+                and (not is_codegen_graph_partition_subgraph(self))
+            ):
                 self.codegen_input_size_and_nan_asserts()
 
     def codegen_input_size_and_nan_asserts(self) -> None:

torch/_inductor/config.py

@@ -437,7 +437,11 @@ max_autotune_report_choices_stats = (
 )
 
 # enable inductor graph partition to allow multiple inductor graphs for the same dynamo graph
-graph_partition = False
+graph_partition: bool = (
+    os.environ.get("TORCHINDUCTOR_GRAPH_PARTITION", "1" if not is_fbcode() else "0")
+    == "1"
+)
+
 
 # force cublas and triton to use the same precision; cublas supports TF32 for matmul operations
 # when m, n, k are multiples of 16, 16, 8, whereas triton supports TF32 for matmul operations

torch/_inductor/cudagraph_utils.py

@@ -10,6 +10,8 @@ from torch._dynamo.utils import counters, get_metrics_context
 from torch._inductor.utils import GraphPartitionMap, InputType
 from torch.utils._ordered_set import OrderedSet
 
+from .utils import is_using_cudagraph_partition
+
 
 if TYPE_CHECKING:
     from collections.abc import Sequence
@@ -170,7 +172,8 @@ def check_multiple_devices_or_any_cpu_nodes(
     # meta tensors are supported since there is no compute
     device_node_mapping.pop(torch.device("meta"), None)
 
-    if torch._inductor.config.graph_partition:
+    # dynamo cudagraph does not support graph partition
+    if is_using_cudagraph_partition():
         # graph partition supports splitting on cpu op. So we can ignore cpu nodes.
         device_node_mapping.pop(torch.device("cpu"), None)
 

torch/_inductor/scheduler.py

@@ -2179,7 +2179,10 @@ class Scheduler:
             self.nodes = comms.reorder_compute_and_comm_for_overlap(self.nodes)
         self.process_grouped_nodes()
 
-        if torch._inductor.config.graph_partition:
+        if (
+            torch._inductor.config.graph_partition
+            and torch._inductor.config.triton.cudagraphs
+        ):
             self.nodes = self.maybe_reorder_for_minimizing_partition(self.nodes)
             self.nodes = self.reorder_for_partition_with_simple_dependency(self.nodes)
 
@@ -4312,6 +4315,12 @@ class Scheduler:
     ) -> bool:
         """Return True if we should partition the inductor graph on this node"""
 
+        # When not using cudagraphs, keep all kernels in the `call` function
+        # instead of graph partition functions, since graph partition only brings
+        # benefit to cudagraph
+        if not torch._inductor.config.triton.cudagraphs:
+            return True
+
         # avoid duplicating logs when should_partition is called multiple times
         # on the same node
         def noop_log(msg: str, node: Optional[BaseSchedulerNode]) -> None:

torch/_inductor/utils.py

@@ -3329,6 +3329,13 @@ def is_codegen_graph_partition_subgraph(wrapper: PythonWrapperCodegen) -> bool:
     )
 
 
+def is_using_cudagraph_partition() -> bool:
+    return (
+        torch._inductor.config.triton.cudagraphs
+        and torch._inductor.config.graph_partition
+    )
+
+
 def dtype_from_size(size: int) -> torch.dtype:
     from .virtualized import V