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Re: [Starpu-devel] StarPU overhead for MPI


Chronologique Discussions 
  • From: Samuel Thibault <samuel.thibault@inria.fr>
  • To: Philippe SWARTVAGHER <philippe.swartvagher@inria.fr>
  • Cc: starpu-devel@lists.gforge.inria.fr, Alexandre Denis <alexandre.denis@inria.fr>
  • Subject: Re: [Starpu-devel] StarPU overhead for MPI
  • Date: Fri, 7 Feb 2020 13:52:39 +0100
  • List-archive: <http://lists.gforge.inria.fr/pipermail/starpu-devel/>
  • List-id: "Developers list. For discussion of new features, code changes, etc." <starpu-devel.lists.gforge.inria.fr>
  • Organization: I am not organized

Hello,

Philippe SWARTVAGHER, le mer. 05 févr. 2020 19:08:41 +0100, a ecrit:
> The gprof output is attached.
>
[...]
> 56.99 10.39 10.39 2930873 0.00 0.01
> _starpu_get_worker_task
> 14.10 12.96 2.57 2165605 0.00 0.00 lws_select_victim
[...]

Mmm, could you run it with STARPU_NCPU=1 to avoid spam from the
idle workers? Probably you can even just disable them by calling
starpu_pause(); before your pingpong.

You may also need to make the test longer for the timing statistics to
get significant.

Samuel




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