Sparsh Mittal <sparsh0mit...@gmail.com> wrote on 02/11/2013 03:08:09 PM:
>
> Thanks. This is really great and works well.
>
> I have small questions.
> 1. So, should I set X10_NTHREADS to numberOfThreads or
> (numberOfThreads+1) to also account for main thread?
> 2. Can we do it through program itself, since I want to run for
> different number of threads.
>
>
Usually we recommend setting X10_NTHREADS so that you create 1 worker
thread per core. Eg, if you have an 8 core machine, reasonable
combinations are:
X10_NPLACES=1; X10_NTHREADS=8
X10_NPLACES=2; X10_NTHREADS=4
X10_NPLACES=4; X10_NTHREADS=2
X10_NPLACES=8; X10_NTHREADS=1
(for more machines, use similar logic...8 machine with 4 cores each, one
reasonable setting would be X10_NPLACES=16; X10_NTHREADS=2).
It is possible to adjust these settings programmatically by calling methods
of x10.lang.Runtime, but this is not recommend for normal usage (it might
interact badly with the heuristics used by the X10 runtime to dynamically
adjust the size of the thread pool when threads block/unblock to try to
keep X10_NTHREADS active worker threads).
--dave------------------------------------------------------------------------------
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