[petsc-users] Nodes Communication - Petsc Vec

[Medane TCHAKOROM]

Re:

I'am currently going through the code.

Thans

On 16/02/2022 16:47, Junchao Zhang wrote:
> https://gitlab.com/petsc/petsc/-/blob/main/src/vec/is/sf/tests/ex9.c
>
> --Junchao Zhang
>
>
> On Wed, Feb 16, 2022 at 9:40 AM Medane TCHAKOROM 
> <medane.tchakorom at univ-fcomte.fr> wrote:
>
>     Re:
>
>
>     Sorry, but I can't find this file in my installation. I'am using
>     Petsc 3.14.2
>
>
>     Thanks
>
>     On 16/02/2022 16:00, Junchao Zhang wrote:
>>     We could still do it. See the example at
>>     petsc/src/vec/is/sf/tests/ex9.c
>>
>>     --Junchao Zhang
>>
>>
>>     On Wed, Feb 16, 2022 at 8:47 AM Medane TCHAKOROM
>>     <medane.tchakorom at univ-fcomte.fr> wrote:
>>
>>         Re:
>>
>>
>>         It does not apply, because "their communicator must be on the
>>         same set of processes" .
>>
>>         In my case, I have two disjoint subcomm from PETSC_COMM_WORD
>>         with same number of processes.
>>
>>         I want to send information (Petsc Vec) from one subcomm to
>>         another subcomm.
>>
>>         Thanks
>>
>>         On 16/02/2022 15:43, Junchao Zhang wrote:
>>>         See Notes at
>>>         https://petsc.org/main/docs/manualpages/PetscSF/VecScatterCreate.html
>>>
>>>
>>>         Does it apply to your case?
>>>
>>>         --Junchao Zhang
>>>
>>>
>>>         On Wed, Feb 16, 2022 at 8:12 AM Medane TCHAKOROM
>>>         <medane.tchakorom at univ-fcomte.fr> wrote:
>>>
>>>             Re:
>>>
>>>             I forgot to mention that the nodes are in differents
>>>             communicators. Does VecScatter functionnality still
>>>             applies ?
>>>
>>>             Thanks.
>>>
>>>             On 16/02/2022 15:03, Matthew Knepley wrote:
>>>>             On Wed, Feb 16, 2022 at 8:55 AM Medane TCHAKOROM
>>>>             <medane.tchakorom at univ-fcomte.fr> wrote:
>>>>
>>>>                 Hello,
>>>>
>>>>                 I want to pass a Petsc Vec from one node to another
>>>>                 one. Is there any
>>>>                 Petsc method for doing this
>>>>
>>>>
>>>>             You likely want the VecScatter functionality. There is
>>>>             a discussion of this in the manual:
>>>>             https://petsc.org/main/docs/manual/vec/?highlight=vecscatter#sec-unstruct
>>>>
>>>>               Thanks,
>>>>
>>>>                 Matt
>>>>
>>>>                 or should I use MPI_Irecv and MPI_Isend for
>>>>                 non-blocking communication ?
>>>>
>>>>                 When using MPI_Isend, can i send a Petsc Vec, or
>>>>                 should I get the array
>>>>                 from it, and then send it ?
>>>>
>>>>                 Thanks
>>>>
>>>>
>>>>
>>>>             -- 
>>>>             What most experimenters take for granted before they
>>>>             begin their experiments is infinitely more interesting
>>>>             than any results to which their experiments lead.
>>>>             -- Norbert Wiener
>>>>
>>>>             https://www.cse.buffalo.edu/~knepley/
>>>>             <http://www.cse.buffalo.edu/~knepley/>
>>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20220216/8144f99f/attachment-0001.html>