• 2019 Update 4
  • 03/20/2019
  • Public Content

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
    adds a kernel to a queue and immediately returns
  • clFinish
    explicitly indicates the completion of kernel execution. You can also use
Wrapping the Right Set of Operations
When using any host-side routine for evaluating performance of your kernel, ensure you wrapped the proper set of operations.
For example, avoid potentially costly and/or serializing routine, like:
  • Including various
  • File input or output operations
  • and so on
Also profile kernel execution and data transferring separately by using OpenCL™ profiling events. Similarly, keep track of compilation and general initialization costs, like buffer creation separately from the actual execution flow.
See Also

Product and Performance Information


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