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Re: [Starpu-devel] Question about MPI usage


Chronologique Discussions 
  • From: Samuel Thibault <samuel.thibault@ens-lyon.org>
  • To: Xavier Lacoste <xl64100@gmail.com>
  • Cc: starpu-devel@lists.gforge.inria.fr
  • Subject: Re: [Starpu-devel] Question about MPI usage
  • Date: Tue, 25 Feb 2014 09:07:29 -0500
  • 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 Tue 25 Feb 2014 11:52:21 +0100, a écrit :
> Thanks, this is due to a read only array that I only register on the node
> which will execute the task.

And no other task will need the array?

> Do I need to register it on every node ?

No, only on nodes which will actually pass it to starpu_mpi_task_insert.

You can also pass NULL to starpu_mpi_task_insert, it will just return
EINVAL.

> Is there an option to tell StarPU that this buffer is already on the
> node that will execute the kernel ?

Well, you at least need to specify an MPI rank for the data, so that
StarPU knows it is here and doesn't have to transfer anything.

Samuel





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