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Re: [Starpu-devel] Performance decreasing by adding empty tasks


Chronologique Discussions 
  • From: Samuel Thibault <samuel.thibault@ens-lyon.org>
  • To: Xavier Lacoste <xavier.lacoste@inria.fr>
  • Cc: starpu-devel@lists.gforge.inria.fr
  • Subject: Re: [Starpu-devel] Performance decreasing by adding empty tasks
  • Date: Mon, 13 Feb 2012 15:46:21 +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>

Xavier Lacoste, le Wed 08 Feb 2012 15:26:40 +0100, a écrit :
> Do you have any clue ?

Not really. We'd need to know why

> I also noticed on all my Gantt diagramms (even with the best ones) that
> I have one task isolated, a large amount of "blocked" time and then my task
> (I can send Gantts)

that ↑ happens. You can for instance try to create a DAG (section
"Performance feedback", "Off-line performance feedback" of the
documentation). Perhaps your use of StarPU implies a lot of useless
dependencies between tasks.

Samuel





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