OpenCL™ Developer Guide for Intel® Core™ and Intel® Xeon® Processors

  • 10/30/2018
  • Public Content
Contents

Host-Side Timing

The following code snippet is a host-side timing routine around a kernel call (error handling is omitted):

float start = …;//getting the first time-stamp
        clEnqueueNDRangeKernel(g_cmd_queue, …);
        clFinish(g_cmd_queue);// to make sure the kernel completed
float end = …;//getting the last time-stamp
float time = (end-start);
In this example, host-side timing is implemented using the following functions:
  • clEnqueueNDRangeKernel
     puts a kernel to a queue and immediately returns
  • clFinish
     explicitly indicates the completion of kernel execution. You can also use
    clWaitForEvents
    .
Remember to profile operations on memory objects separately.

See Also

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.