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Re: [Starpu-devel] Problem with performance model calibration


Chronologique Discussions 
  • From: Mirko Myllykoski <mirkom@cs.umu.se>
  • To: Samuel Thibault <samuel.thibault@inria.fr>, starpu-devel@lists.gforge.inria.fr
  • Subject: Re: [Starpu-devel] Problem with performance model calibration
  • Date: Mon, 1 Jun 2020 13:55:36 +0200
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  • Organization: Umeå University / HPC2N

Hi,

On 2020-05-20 19:04, Samuel Thibault wrote:
No, the shape seems relatively nice enough. But perhaps put printfs in
the loop of _starpu_regression_non_linear_power to check that it does
get called and whether it perhaps diverges to nan.

I investigated the _starpu_regression_non_linear_power function. It appears that some list entities (1st argument) are invalid in the sense that the "mean" field is 0.0. This causes a situation where "cmax" becomes zero and NaNs follow...

I modified the find_list_size and dump_list functions so that the invalid list entries are ignored. This fixes the fitting problem. However, I am somewhat concerned over the fact that some of the ignored list entities correspond tasks that are not that small. Could there be something wrong with the time measurement?

- Mirko

--
Mirko Myllykoski, Ph.D.
Senior research engineer, Department of Computing Science
Application expert, HPC2N
Umeå University

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