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starpu-devel - Re: [Starpu-devel] Bug report: STARPU_SPMD does not handle buffers without explicit backing memory

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Re: [Starpu-devel] Bug report: STARPU_SPMD does not handle buffers without explicit backing memory


Chronologique Discussions 
  • From: Samuel Thibault <samuel.thibault@inria.fr>
  • To: Jan Polák <456647@mail.muni.cz>
  • Cc: starpu-devel@lists.gforge.inria.fr
  • Subject: Re: [Starpu-devel] Bug report: STARPU_SPMD does not handle buffers without explicit backing memory
  • Date: Fri, 30 Aug 2019 17:30:48 +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

Jan Polák, le jeu. 29 août 2019 12:19:09 +0200, a ecrit:
> The gist of the problem is that any buffers without explicit backing memory
> (home node -1, null backing memory) are not passed through to the codelet
> functions when running on combined workers through STARPU_SPMD.

Mmm, right, only rank 0 will have triggered/waited for
transfer/allocation and thus get the pointers.

> (And maybe STARPU_FORKJOIN as well,

Probably not since rank 0 in that case will have everything.

We'll need to make other ranks wait for the transfer/allocation before
filling the buffer and proceeding.

Samuel




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