Re: [Starpu-devel] Request help for StarPU-MPI data_handle copy behaviour.

[Emmanuel Agullo <Emmanuel.Agullo@inria.fr>]

Dear Sameer,

As far as I know, none of us at Inria Bordeaux is attending the school
(but I might not have all the information). In any case, feel free to
visit us during your stay in France, for instance after the school,
beginning of July.

With best regards,

Emmanuel

Sameer Deshmukh <sameer.deshmukh@rio.gsic.titech.ac.jp> writes:

> Dear Emmanuel and Olivier,
>
> Thank you for your help. I'll have a look at the functions and see if they
> work in my code.
>
> As an aside, I will be attending the Gene Golub Summer School being
> organized by INRIA next week. Will we get to meet each other there?
>
> On Wed, Jun 12, 2019 at 10:59 PM Olivier Aumage <olivier.aumage@inria.fr>
> wrote:
>
>> Dear Sameer,
>>
>> The family of functions "starpu_vector_ptr_register()" and alike should do
>> what you want.
>>
>> The purpose of starpu_data_register_same is different: it creates a new
>> data
>> handle with parameters copied from a pre-existing data handle.
>>
>> Best regards,
>> --
>> Olivier Aumage
>>
>> > Le 12 juin 2019 à 15:30, Emmanuel Agullo <emmanuel.agullo@inria.fr> a
>> écrit :
>> >
>> > Dear Sameer,
>> >
>> > Sorry for the late response. I just discussed with StarPU developers. It
>> > will be better to directly interact with them (CC) on this advanced
>> > question.
>> >
>> > Best regards,
>> >
>> > Emmanuel
>> >
>> > Sameer Deshmukh <sameer.deshmukh@rio.gsic.titech.ac.jp> writes:
>> >
>> >> Dear Emmanuel,
>> >>
>> >> My name is Sameer Deshmukh, from Rio Yokota Lab at Tokyo Institute of
>> >> Technology, Japan. I'm an M2 student conducting research on H-matrices.
>> >>
>> >> I'm currently trying to use starPU to create a dynamic distributed
>> Hierarchical
>> >> matrix library for H2 matrices, and am running into some problems when
>> >> interfacing starPU with my code. Would be great if you could shed some
>> light on
>> >> the following question.
>> >>
>> >> So basically I have registered some data handles of type
>> `starpu_data_handle_t`
>> >> using the `starpu_mpi_data_handle_register` function, and at some point
>> of time
>> >> in the code, the data that is held within these pointers needs to be
>> destroyed
>> >> and new data created in its place.
>> >>
>> >> Now the older data already has some dependencies defined on it, and I
>> wish to
>> >> 'transfer' these dependencies to the new data possibly by copying the
>> contents
>> >> of the older data handles. The new data will strictly reside on the
>> same node as
>> >> the older data.
>> >>
>> >> I tried using `starpu_data_register_same` but it complains that the
>> handle is
>> >> not registered (maybe this function is not meant to be used with the MPI
>> >> interface?).
>> >>
>> >> Could you please tell me if its possible to make this handle copying +
>> >> dependency transfer happen in starPU?
>> > _______________________________________________
>> > Starpu-devel mailing list
>> > Starpu-devel@lists.gforge.inria.fr
>> > https://lists.gforge.inria.fr/mailman/listinfo/starpu-devel
>>
>>