[GitHub] lebeg opened a new issue #12107: Faulty CUDA detection with cmake

[GitBox <gi...@apache.org>]

lebeg opened a new issue #12107: Faulty CUDA detection with cmake
URL: https://github.com/apache/incubator-mxnet/issues/12107
 
 
   ### Problem
   The current cmake CUDA support has multiple major problems.
   
   **Multiple not compatible definitions**
   
   CUDA can be part of cmake language detection and is not for older cmake versions.
   
   CUDA architectures can be detected by build-in cmake file. This would be preferred, but is not used by the current MXNet cmake scripts.
   
   CUDA is detected by 3 different files in the current cmake scripts and the choice of those is based on a obscure logic with involves different versions of cmake and platforms which it's building on
   
   - CMakeLists.txt
   - cmake/FirstClassLangCuda.cmake
   - 3rdparty/mshadow/cmake/Cuda.cmake
   
   **No support for new CUDA architectures or faulty detection**
   
   Only 3rdparty/mshadow/cmake/Cuda.cmake supports Volta architecture, but not in all circumstances.
   
   In a lot of situations the right architecture can not be detected properly and the script falls back to build all architectures bowing up both: build time and artefact size.
   
   cmake/FirstClassLangCuda.cmake is outdated and does not support Volta at all.
   
   **Confusing and misleading cmake user options**
   
   Currently USE_CUDA / USE_OLDCMAKECUDA. Some of them will do or not do what they supposed to based on cmake generator version and version of cmake.
   
   **Other problems with dependencies**
   
   For example the caffe integration raises the minimum required cmake version to 3.3 due required to c++11 support.
   
   ### Solution
   As a solution all custom detection of CUDA should be removed and if CUDA is used the minimum cmake version should be raised to 3.10 due to support of latest Volta architectures.
   
   [MXNET-796](https://issues.apache.org/jira/browse/MXNET-796)

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