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update build tutorial - choose the correct VS version (#54933)

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Summary:
There might be regressions in newest VS.
Remind users to choose the stable VC version as our CI's

Pull Request resolved: https://github.com/pytorch/pytorch/pull/54933

Reviewed By: walterddr

Differential Revision: D27466645

Pulled By: malfet

fbshipit-source-id: a6a1ebea4cc1b22e13c7342ee4c061afcef7e2b5
This commit is contained in:
Yi Zhang
2021-03-31 13:43:55 -07:00
committed by Facebook GitHub Bot
parent 2a7df657fe
commit 8ad32dbbd7
1 changed files with 7 additions and 1 deletions
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README.md
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@ -264,9 +264,15 @@ Each CUDA version only supports one particular XCode version. The following comb
On Windows
Choose Correct Visual Studio Version.
Visual Studio upgrades are very often. Sometimes, there're regressions in some new versions.
It'd best to use the same Visual Studio Version as [PyTorch CI's](https://github.com/pytorch/pytorch/blob/a1bd7918cc5a06cbef6c5178259bf0a7b5ab1ce3/.circleci/scripts/vs_install.ps1#L4).
You can use Visual Studio Enterprise, Professional or Community though PyTorch CI uses Visual Studio BuildTools.
Build with CPU
It's fairly easy to build with CPU. Visual Studio 2019 version 16.7.6 (MSVC toolchain version 14.27) or higher is recommended.
It's fairly easy to build with CPU.
Note on OpenMP: The desired OpenMP implementation is Intel OpenMP (iomp). In order to link against iomp, you'll need to manually download the library and set up the buliding environment by tweaking `CMAKE_INCLUDE_PATH` and `LIB`. The instruction [here](https://github.com/pytorch/pytorch/blob/master/docs/source/notes/windows.rst#building-from-source) is an example for setting up both MKL and Intel OpenMP. Without these configuraions for CMake, Microsoft Visual C OpenMP runtime (vcomp) will be used.