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

[Samuel Thibault <samuel.thibault@inria.fr>]

Mirko Myllykoski, le mer. 20 mai 2020 18:25:39 +0200, a ecrit:
> On 2020-05-20 17:39, Samuel Thibault wrote:
> 
> > More precisely, that it didn't compute the non-linear model. (the linear
> > one is always computed since it's easy).  Perhaps check how that happens
> > for tests/perfmodels/non_linear_regression_based.c vs how that doesn't
> > seem to happen with your application. Normally that happens during
> > starpu_shutdown in _starpu_deinitialize_registered_performance_models,
> > in dump_reg_model that calls _starpu_regression_non_linear_power.
> 
> I experimented with non-linear models and my code indeed calibrates the
> non-linear models for some tasks. I am assuming that the GEMM tasks are
> simply too noisy. Is this plausible?

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.

Samuel