Am running Fedora 24 x86_64 w/ GeForce gtx 750 Ti. For the last couple of weeks, everything seemed fine. clGetPlatformIDs was discovering 1 platform, and it contained my GPU. However, today, there are two platforms. The first one is the one I am used to, while the 2nd platform is invalid when I use clPlatformGetInfo. Curiously, clinfo seems to have no problem describing both platforms:
> clinfo Number of platforms 2 Platform Name NVIDIA CUDA Platform Vendor NVIDIA Corporation Platform Version OpenCL 1.2 CUDA 8.0.0 Platform Profile FULL_PROFILE Platform Extensions cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_copy_opts Platform Extensions function suffix NV Platform Name Clover Platform Vendor Mesa Platform Version OpenCL 1.1 Mesa 12.0.1 Platform Profile FULL_PROFILE Platform Extensions cl_khr_icd Platform Extensions function suffix MESA
Any ideas why things have changed for me? I suspect this is also affecting the compute results of running kernels on my GPU, even when I make sure to use the first platform. On my link lines, I use
to make sure I pick up the nvidia symbols, if they are there. For example, clGetPlatformIDs is not in the nvidia library.