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- From: Samuel Thibault <samuel.thibault@inria.fr>
- To: Philippe SWARTVAGHER <philippe.swartvagher@inria.fr>
- Cc: starpu-devel@lists.gforge.inria.fr, Alexandre Denis <alexandre.denis@inria.fr>
- Subject: Re: [Starpu-devel] StarPU overhead for MPI
- Date: Wed, 5 Feb 2020 18:03:23 +0100
- 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
Hello,
Philippe SWARTVAGHER, le mer. 29 janv. 2020 17:19:10 +0100, a ecrit:
> The overhead seems a little bit huge (a small comm lasts 10 times longer).
> Do you know what could be the origin of this overhead ?
StarPU tasks (here, one is used for each MPI request) are costly, yes,
because they track a data dependency, check that it's not on a GPU, etc.
so a few additional µs is not really surprising. It is a bit surprising
that it's so many µs, a gprof would help to get an idea where most time
is spent.
Samuel
- Re: [Starpu-devel] StarPU overhead for MPI, Philippe SWARTVAGHER, 05/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Samuel Thibault, 07/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Philippe SWARTVAGHER, 12/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Samuel Thibault, 12/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Philippe SWARTVAGHER, 13/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Samuel Thibault, 12/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Philippe SWARTVAGHER, 12/02/2020
- <Suite(s) possible(s)>
- Re: [Starpu-devel] StarPU overhead for MPI, Samuel Thibault, 05/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Philippe SWARTVAGHER, 05/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Samuel Thibault, 07/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Philippe SWARTVAGHER, 05/02/2020
- Re: [Starpu-devel] StarPU overhead for MPI, Samuel Thibault, 07/02/2020
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