[Rtk-users] Fix the issue when use RTK on Nvidia Kepler Architecture based GPU.

[刘鹏]

Hello,

 

I find an issue when I try to use RTK on a Nvidia Kepler based GPU.

The CUDA initializing always fails.

And I can see an exception about _cudaMutexOperation when any CUDA function is called in debug mode.

 

Exception at 0x7fefd5f940d, code: 0xe06d7363: C++ exception, flags=0x1 (execution cannot be continued) (first chance) in cudart64_50_35!_cudaMutexOperation

 

 

Following the guide in

http://docs.nvidia.com/cuda/kepler-compatibility-guide/index.html

 

This issue can be fixed by applying the patch on RTK code:

 

 

===========================================================================

 

diff --git a/cmake/FindCUDA_wrap.cmake b/cmake/FindCUDA_wrap.cmake

index e13a7c3..b40c6da 100644

--- a/cmake/FindCUDA_wrap.cmake

+++ b/cmake/FindCUDA_wrap.cmake

@@ -59,9 +59,19 @@ set (CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS}

     )

 

 if(CUDA_VERSION_MAJOR GREATER "2")

-  set (CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS}

-        -gencode arch=compute_20,code=sm_20

-    )

+  IF(${CUDA_VERSION} LESS 5.0)

+   set (CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS}

+         -gencode arch=compute_20,code=sm_20

+         -gencode arch=compute_20,code=compute_20

+     )

+  ELSE()

+   set (CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS}

+         -gencode arch=compute_20,code=sm_20

+         -gencode arch=compute_30,code=sm_30

+         -gencode arch=compute_35,code=sm_35

+         -gencode arch=compute_35,code=compute_35

+     )

+  ENDIF()

endif()

 

 if(CUDA_FOUND)

 

============================================================================

 

Regards,

 

Peng Liu
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