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

[Sameer Deshmukh <sameer.deshmukh@rio.gsic.titech.ac.jp>]

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?
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--

Regards,

Sameer Deshmukh