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Re: [Starpu-devel] Control data movement to/from device


Chronologique Discussions 
  • From: Samuel Thibault <samuel.thibault@inria.fr>
  • To: Amani Alonazi <amani.alonazi@kaust.edu.sa>
  • Cc: starpu-devel@lists.gforge.inria.fr, Hatem Ltaief <Hatem.Ltaief@kaust.edu.sa>
  • Subject: Re: [Starpu-devel] Control data movement to/from device
  • Date: Tue, 16 Apr 2019 15:45:14 +0200
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Amani Alonazi, le mar. 16 avril 2019 16:19:12 +0300, a ecrit:
> Ok I got something. Setting the following variable help with the data
> movement.
> STARPU_SCHED_BETA=200

That's a quite strong value. Are the bandwidth values reported by
starpu_machine_display meaningful for the disk being considered?
(you will need the current 1.3 branch, because it seems nobody thought
about including disks in its output, so I added it just now).

> Is there any other way to enforce locality while using lws/dmdar?

lws does not actually care about data, it just happens to try to keep
tasks together. For dmdar this is indeed the proper way to make locality
stronger.

Now, if even dmdar does not manage to get good locality, this is a
testcase we would be interested in to improve our scheduling heuristics.

Samuel




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