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系统环境

CUDA平台

  • OS: Ubuntu 20.04.6 LTS
  • CUDA: 11.8
  • CUDNN: 8.9
  • CMake: 3.27.7

ROCm平台

  • OS: kylin V10
  • DTK: 23.10.1
  • MiOpen: 2.15.3
  • CMake: 3.27.7

问题现象

重点关注CMakeLists.txt中为可执行测试文件设置属性的代码。

set_tests_properties(EnvVarTest PROPERTIES ENVIRONMENT "LD_LIBRARY_PATH=/work/Paddle/build/python/paddle/libs:\$LD_LIBRARY_PATH")

在CUDA平台下,\$LD_LIBRARY_PATH可以被正常解析,执行测试能够获取到cudnn的版本。但在ROCm平台下,\$LD_LIBRARY_PATH无法被正确解析,必须改为$ENV{LD_LIBRARY_PATH}才能正常执行。

这两种方式的主要区别是:

  • 若为\$LD_LIBRARY_PATH,则该变量会简单传递给ctest不做处理,ctest需要依赖系统解析展开。
  • 若为$ENV{LD_LIBRARY_PATH},则该变量由cmake解析并展开,ctest获取到的直接就是展开后的值。

Ubuntu系统下,\$LD_LIBRARY_PATH会被正确解析,所以可以正常执行。但Kylin系统下,\$LD_LIBRARY_PATH无法被正确解析,导致找不到MiOpen等所需的库。但改为$ENV{LD_LIBRARY_PATH}后,ctest获取到的是展开的环境变量,从而能够正常执行。

测试步骤

CUDA平台

cd CTestDemo
mkdir build
cmake .. -DWITH_CUDA=ON
make
ctest -VV

ROCm平台

cd CTestDemo
mkdir build
cmake .. -DWITH_ROCM=ON
make
ctest -VV

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