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BenchMarking CLFFT

Question asked by karthik_hegde on Oct 27, 2014
Latest reply on Nov 5, 2014 by pinform



I am trying to benchmark clamdfft on AMD radeon 7470M. Kindly comment on the method of benchmarking.


I call the FFT kernel like this, with event as cl_event.


err = clAmdFftEnqueueTransform(planHandle, CLFFT_BACKWARD, 1, &queue, 0, NULL, &event,

        buffersIn, buffersOut, tmpBuffer);


With profiling enabled I get the time elapsed like this.


  clGetEventProfilingInfo(event, CL_PROFILING_COMMAND_START, sizeof(time_start), &time_start, NULL);

  clGetEventProfilingInfo(event, CL_PROFILING_COMMAND_END, sizeof(time_end), &time_end, NULL);

  total_time = time_end - time_start;

  printf("%0.6f \t", (total_time / 1000000.0));



Is this the right way to benchmark clfft?  My results are as follows,

(time in milli seconds for FFT length in powers of 2 - starting from 2 power 1)