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- From: Samuel Thibault <samuel.thibault@ens-lyon.org>
- To: Lennox Wu <lennox.wu@gmail.com>
- Cc: starpu-devel@lists.gforge.inria.fr
- Subject: Re: [Starpu-devel] About the prediction model of data transfer time
- Date: Wed, 2 Jul 2014 11:11:09 +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>
Lennox Wu, le Wed 02 Jul 2014 16:48:52 +0800, a écrit :
> I didn't find the prediction model from your papers(Was it written
> somewhere?),
The paper about performance models is http://hal.inria.fr/inria-00421333
> I found the function "starpu_transfer_predict", is it the prediction
> model?
This is the data transfer prediction model.
> I can't understand the meaning behind the fomular
> "2*(topology->ncudagpus+topology->nopenclgpus)",
> could anybody explain it?
The data transfer prediction is very rough: since the measurement is
done off-line, we divide by the number of the GPUs to account for
contention in a quite rough manner.
The task prediction models are in src/core/perfmodel,
starting from starpu_model_expected_perf, which
ends up for instance in perfmodel_history.c's
_starpu_history_based_job_expected_perf for the simple average over
history, or _starpu_regression_based_job_expected_perf for the
regression-based model, etc.
Samuel
- [Starpu-devel] About the prediction model of data transfer time, Lennox Wu, 02/07/2014
- Re: [Starpu-devel] About the prediction model of data transfer time, Samuel Thibault, 02/07/2014
- Re: [Starpu-devel] About the prediction model of data transfer time, Lennox Wu, 02/07/2014
- Re: [Starpu-devel] About the prediction model of data transfer time, Samuel Thibault, 02/07/2014
- Re: [Starpu-devel] About the prediction model of data transfer time, Lennox Wu, 04/07/2014
- Re: [Starpu-devel] About the prediction model of data transfer time, Samuel Thibault, 02/07/2014
- Re: [Starpu-devel] About the prediction model of data transfer time, Lennox Wu, 02/07/2014
- Re: [Starpu-devel] About the prediction model of data transfer time, Samuel Thibault, 02/07/2014
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