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- 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
- Re: [Starpu-devel] Question about MPI usage, Nathalie Furmento, 03/02/2014
- Re: [Starpu-devel] Question about MPI usage, Xavier Lacoste, 25/02/2014
- Re: [Starpu-devel] Question about MPI usage, Samuel Thibault, 25/02/2014
- Re: [Starpu-devel] Question about MPI usage, Xavier Lacoste, 25/02/2014
- Re: [Starpu-devel] Question about MPI usage, Samuel Thibault, 25/02/2014
- Re: [Starpu-devel] Question about MPI usage, Nathalie Furmento, 25/02/2014
- Re: [Starpu-devel] Question about MPI usage, Samuel Thibault, 25/02/2014
- Re: [Starpu-devel] Question about MPI usage, Xavier Lacoste, 25/02/2014
- Re: [Starpu-devel] Question about MPI usage, Samuel Thibault, 25/02/2014
- Re: [Starpu-devel] Question about MPI usage, Xavier Lacoste, 25/02/2014
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