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Revert "Make distributed modules importable even when backend not built (#159889)" (#162568)

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This reverts commit a0d026688cd69583d5a4e0c6f3e5fda141a7f4a9.

Revert "Always build USE_DISTRIBUTED. (#160449)"

This reverts commit d80297a6846f1f2c36fd4f19e22919f2abe8fcea.

Pull Request resolved: https://github.com/pytorch/pytorch/pull/162568
Approved by: https://github.com/huydhn
This commit is contained in:
Edward Yang
2025-09-10 00:24:16 -04:00
committed by PyTorch MergeBot
parent 11acfed3ce
commit dda071587f
50 changed files with 436 additions and 759 deletions
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12
CMakeLists.txt
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@ -181,9 +181,8 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(ppc64le)")
set(CPU_POWER ON)
endif()
# For non-supported platforms, turn USE_DISTRIBUTED off by default.
# NB: USE_DISTRIBUTED simply disables the backend; distributed code
# still gets built
# For non-supported platforms, turn USE_DISTRIBUTED off by default. It is not
# tested and likely won't work without additional changes.
if(NOT LINUX AND NOT WIN32)
set(USE_DISTRIBUTED
OFF
@ -263,11 +262,11 @@ option(USE_PYTORCH_METAL "Use Metal for PyTorch iOS build" OFF)
option(USE_PYTORCH_METAL_EXPORT "Export Metal models on MacOSX desktop" OFF)
option(USE_NATIVE_ARCH "Use -march=native" OFF)
cmake_dependent_option(USE_MPS "Use MPS for macOS build" ON "MPS_FOUND" OFF)
option(USE_DISTRIBUTED "Enable default distributed backends" ON)
option(USE_DISTRIBUTED "Use distributed" ON)
cmake_dependent_option(USE_NCCL "Use NCCL" ON
"USE_DISTRIBUTED;USE_CUDA OR USE_ROCM;UNIX;NOT APPLE" OFF)
cmake_dependent_option(USE_XCCL "Use XCCL" ON
"USE_DISTRIBUTED;USE_XPU;UNIX;NOT APPLE" OFF)
"USE_XPU;UNIX;NOT APPLE" OFF)
cmake_dependent_option(USE_RCCL "Use RCCL" ON USE_NCCL OFF)
cmake_dependent_option(USE_RCCL "Use RCCL" ON "USE_NCCL;NOT WIN32" OFF)
cmake_dependent_option(USE_STATIC_NCCL "Use static NCCL" OFF "USE_NCCL" OFF)
@ -432,10 +431,11 @@ if(WIN32)
PATH_SUFFIXES lib
NO_DEFAULT_PATH)
if(NOT libuv_tmp_LIBRARY)
set(USE_DISTRIBUTED OFF)
set(USE_GLOO OFF)
message(
WARNING
"Libuv is not installed in current conda env. Set USE_GLOO to OFF. "
"Libuv is not installed in current conda env. Set USE_DISTRIBUTED to OFF. "
"Please run command 'conda install -c conda-forge libuv=1.39' to install libuv."
)
else()