[petsc-users] Nodes Communication - Petsc Vec

[Medane TCHAKOROM]

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/>
>
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