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

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

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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