cmake and emulation mode

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi all. I am new in CUDA, and this is my first post here.

I am using the findCuda script for merging some CUDA code with an existing c++ code using cmake. I use Ubuntu Linux 8.04 and my graphics card is an Nvidia Quadro 4600 FX.

My problem is that the executable is always running in emulation mode, even if CUDA_BUILD_TYPE is set to Device

I have several CMakeLists.txt files, The one in the base directory the relevant lines there are:

CMAKE_MINIMUM_REQUIRED(VERSION 2.4)

PROJECT(mytest)

ENABLE_TESTING()

INCLUDE(${CMAKE_SOURCE_DIR}/CMake/cuda/FindCuda.cmake)

ADD_SUBDIRECTORY(cpp)

ADD_SUBDIRECTORY(cuda)

In the cpp directory the CMakeLists.txt file looks like

ADD_DEFINITIONS(-DTHIS_SOURCE_DIR=\"${CMAKE_CURRENT_SOURCE_DIR}\")

ADD_LIBRARY(mylib_cpp mylib_cpp.cc)

And in the cuda directory it is something like:

SET(CUDA_BUILD_TYPE Device)

ADD_DEFINITIONS(-DTHIS_SOURCE_DIR=\"${CMAKE_CURRENT_SOURCE_DIR}\")

CUDA_ADD_LIBRARY(mylib_cuda 

  mylib_cuda.cu

  mylib_cuda_kernels.cu

)

CUDA_ADD_EXECUTABLE(mylib_test mylib_test.cu

  )

TARGET_LINK_LIBRARIES(mylib_test 

                      mylib_cpp

                      mylib_cuda

)

The code is compiling and the executable does what it is intended to do. The problem is that I am not able to run it in Device mode. I don’t think that it is a matter of linux permissions (I have changed them to 666 and ran the code with sudo).

Thanks for your help

Regards

2

According to Abe stephens, the author of FindCuda script, the CUDA_BUILD_TYPE must be set with “Device” with a CAPITAL ‘D’. Otherwise, it would still run in Emulation only!

Check that out.

Also, if you had set “Device” in CMAKE-GUI then you better do a “configure” and “generate” from GUI itself – otherwise your changes will not reflect in CMakeCache.txt.

Also check CMakeCache.txt to see what exactly is set for “CUDA_BUILD_TYPE”

And, you can always hack FindCuda to do some “MESSAGE” to console – so you know which control path it is taking.

Good Luck

3

Thank you Sarnath. The capital ‘D’ was ok but the point was that the quotation marks were missing, and it was always defaulting to emulation mode.

Regards,