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

[Mirko Myllykoski <mirkom@cs.umu.se>]

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

By sending an email to Umeå University, the University processes your 
personal data. For more information, please read: https://www.umu.se/en/gdpr