Re: [Starpu-devel] Online Performance Monitoring With Performance Models in Fortran StarPU

[Marcelo Cogo Miletto <marcelo.miletto@inf.ufrgs.br>]

Thank you very much Olivier, that certainly will help me.

On 2020-10-20 10:13, Olivier Aumage wrote:
> Hi,
>
> Thanks for the report. The Fortran API is basically extended on demand, and
> that feature had not been requested so far.
>
> I have now added some minimal support for using performance models from the
> Fortran API in the "master" branch of the StarPU repository.
>
> The example file "examples/native_fortran/nf_vector.f90" shows an example on
> how to use this.
>
> Best regards,
> --
> Olivier Aumage
>
> > Le 20 oct. 2020 à 13:00, Marcelo Cogo Miletto 
> > <marcelo.miletto@inf.ufrgs.br> a écrit :
> >
> > Dear StarPU team,
> >
> > I have been trying, without success, to use a performance model for
> > online performance monitoring in a Fortran application that uses
> > StarPU (release 1.3.7) to use data-aware schedulers. The best result I
> > got so far was an empty model being dumped in the
> > $STAPU_HOME/.starpu/sampling/codelets/45.
> >
> > I tried to include functions in the src/util/fstarpu.c and in
> > include/fstarpu_mod.F90, to allocate and configure the performance
> > model, assigning it to a codelet in a very similar way to how the task
> > codelet structure creation and configuration is done in the Fortran
> > examples (e.g., using fstarpu_codelet_allocate, fstarpu_codelet_set_name).
> >
> > I use a c_ptr type variable in Fortran that should hold the performance
> > model structure address. Then, I set its symbol and its type to
> > STARPU_HISTORY_BASED,  initialize it by calling starpu_perfmodel_init, and
> > assign it to the codelet structure using cl->model = &my_model, all
> > this with the functions abovementioned.
> >
> > Other things that I have considered:
> > - STARPU_CALIBRATE set to 1
> > - STARPU_SCHED set to dmda
> > - Application calls fstarpu_init
> > - Application calls fstarpu_shutdown
> >
> > The performance model dumped file reports that model->state->ncombs is
> > 0, so it does not print anything after the file header:
> >
> > ##################
> > # Performance Model Version
> > 45
> >
> > ####################
> > # COMBs
> > # number of combinations
> > 0
> >
> > At this point, I'm a little bit lost on where the problem is. As I'm
> > not very acquainted with Fortran, I wonder if this is the right path
> > to use such models in a StarPU Fortran application. Also, I would find
> > helpful if you have some minimal code example on how to do it properly
> > to share with me.
> >
> > Best,
> > Marcelo Miletto.
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