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CUDA-x86.

Problems with "__select_nocancel" when using the P

 
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OceanCloud



Joined: 27 Nov 2012
Posts: 12

PostPosted: Thu Apr 03, 2014 8:18 pm    Post subject: Problems with "__select_nocancel" when using the P Reply with quote

I write a CUDA Fortran program and when I use the PGPROF tool to test the program performance. I find there is a function named "__select_nocancel" in the function list, and it take over 52 percent of the time.

Can someone tell me what the function "__select_nocancel" is?
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mkcolg



Joined: 30 Jun 2004
Posts: 5952
Location: The Portland Group Inc.

PostPosted: Fri Apr 04, 2014 10:36 am    Post subject: Reply with quote

Hi OceanCloud,

That's the CPU waiting for the GPU kernels to finish.

- Mat
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