* Jie Chen <[EMAIL PROTECTED]> wrote:
> Since I am using affinity flag to bind each thread to a different
> core, the synchronization overhead should increases as the number of
> cores/threads increases. But what we observed in the new kernel is the
> opposite. The barrier overhead of two threads is 8.93 micro seconds vs
> 1.86 microseconds for 8 threads (the old kernel is 0.49 vs 1.86). This
> will confuse most of people who study the
> synchronization/communication scalability. I know my test code is not
> real-world computation which usually use up all cores. I hope I have
> explained myself clearly. Thank you very much.
btw., could you try to not use the affinity mask and let the scheduler
manage the spreading of tasks? It generally has a better knowledge about
how tasks interrelate.
Ingo
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