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

[Olivier Aumage <olivier.aumage@inria.fr>]

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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