Intel® oneAPI Threading Building Blocks
Ask questions and share information about adding parallelism to your applications when using this threading library.
This community is designed for sharing of public information. Please do not share Intel or third-party confidential information here.
2421 Discussions

Avoid QueryPerformanceFrequency() call in tick_count::interval_t()

Hi all, Every time the tbb::tick_count::interval_t(double sec) constructor is called, the ticks_per_second() method gets called. Inside the ticks_per_second() method, the QueryPerformanceFrequency() function gets called (on Windows targets). All those calls are inefficient, as stated in A simple way to handle his would be to modify the ticks_per_second() method like this, so that the QueryPerformanceFrequency() call is done only the first time : static LARGE_INTEGER qpfreq; int rval = (qpfreq.QuadPart == 0) ? QueryPerformanceFrequency(&qpfreq) : TRUE; instead of : LARGE_INTEGER qpfreq; int rval = QueryPerformanceFrequency(&qpfreq); This way, each time we call condition_variable.wait_for(interval_t(0.1)) for example, we don't get any penalty during interval_t construction. Do you think it would be possible to integrate this tiny modification inside the TBB ? I know it looks like a detail, but it would be useful I think. Thanks a lot. Best regards, Vincent
0 Kudos
0 Replies