[petsc-users] Nodes Communication - Petsc Vec

[Junchao Zhang]

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/>
>>>
>>>
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