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Re: [Starpu-devel] Problem with performance model calibration


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  • From: Samuel Thibault <samuel.thibault@inria.fr>
  • To: Mirko Myllykoski <mirkom@cs.umu.se>
  • Cc: starpu-devel@lists.gforge.inria.fr
  • Subject: Re: [Starpu-devel] Problem with performance model calibration
  • Date: Fri, 5 Jun 2020 13:52:42 +0200
  • 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
Mirko Myllykoski, le ven. 05 juin 2020 13:49:00 +0200, a ecrit:
> My memory is that StarPU does not actually extract the execution time
> from the events. Instead, StarPU records the wall-time when the CUDA
> event is checked (in _starpu_driver_end_job?). Is this correct?

Yes. Last time we had a look, asking CUDA to record the time was
bringing various additional synchronization. Anyway, what StarPU needs
to know for scheduling decisions is what it will be able to observe to
release other tasks, it doesn't really need to care about what actually
happens inside the GPU.

Samuel


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