CUDA Profiler

Accelerated Computing CUDA CUDA Programming and Performance
1

Hello,

I am asking about what does it mean the CPUTime in the Cuda profiler Log?, In fact my problem is that I have two different kernels that use the same data size, the GPU Times are different while that the CPU ones are not.

method=[ kernel_cnt_P1 ] gputime=[ 56054.879 ] cputime=[ 56103.000 ] occupancy=[ 0.583 ]

method=[ kernel_cnt_P2 ] gputime=[ 44060.863 ] cputime=[ 44110.000 ] occupancy=[ 0.542 ]

Can you explain me, please.

Thanks

2

good question.
I would also like to know what are these gputime, cputime and occupancy.

3

ok, I got whats occupancy…
but still… gputime and cputime?

4

gputime is the time spent in the function on the gpu.
cputime is the time spent in the function plus the overhead to call it.