[petsc-users] Update of the buffer

[Matthew Knepley]

On Thu, Feb 10, 2022 at 9:17 AM Medane TCHAKOROM <
medane.tchakorom at univ-fcomte.fr> wrote:

> Hello ,
>
> Sorry if this question does not belong to this mailling list, i'am using
> Petsc , but with some
>
> MPI parts code, when dealing with communication.
>
> If a make two consecutive MPI_Isend requests, and if the destination
> processor has not yet receive the message inbetween the two calls, will the
> buffer be updated ? I mean if I send message "1" for the first request,
> then send "0" as the second message. Will the receiver receive "0" as
> message ? I not, how can I do to update the message ?
>
I believe that MPI guarantees in-order message delivery from a source to a
target, so if you send 1 before 0, the receiver
should get them in that order. However, someone here should know for sure.

  Thanks,

    Matt


> 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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