Anton Chernov created MXNET-796:
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Summary: Faulty CUDA detection with cmake
Key: MXNET-796
URL: https://issues.apache.org/jira/browse/MXNET-796
Project: Apache MXNet
Issue Type: Bug
Reporter: Anton Chernov
h2. 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cmake/FirstClassLangCuda.cmake is outdated and does not support Volta at all.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.
h2. 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.
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