Offload Timers for Intel® Graphics Technology

This topic only applies to IA-32 architecture targeting Intel® Graphics Technology. Intel® Graphics Technology is a preview feature.

The timers maintained by the offload runtime are useful for breaking down the time of an offload session and to better focus your tuning efforts. For example, timers may show that further tuning of the compiled code will not help because the overhead of offloading is decisive.

You can set the runtime to print timing information at the end of execution by setting GFX_SHOW_TIME to 1. The runtime prints something similar to the following:

GFX performance timers with non-zero value (milllsecond,activation counter):
                   Offload Total = 3.94, 3
                 Device Creation = 42.10, 1
                 Kernel Creation = 0.09, 1
                Kernel Execution = 2.53, 1
      Kernel Execution on Device = 0.03, 1
                 Buffer Creation = 0.25, 4
              Buffer Destruction = 0.03, 3
                  Buffer Reading = 0.08, 1
                  Buffer Writing = 0.39, 4
       Iteration Space Splitting = 0.02, 1
                  Argument Setup = 0.62, 2
                     ELF Parsing = 0.12, 1
                 Program Loading = 14.31, 1

To disable timer printing, set GFX_SHOW_TIME to either an empty string or 0.

The following table describes the meaning of each timer: