[Mpi3-ft] MPI_Comm_validate_all

[Graham, Richard L.]

You can't guarantee all will return, but you can guarantee that those who
do, will return the same value.  So you will get the status just before
the call - which is the intent of this call.

Rich

On 2/16/11 3:49 PM, "Darius Buntinas" <buntinas at mcs.anl.gov> wrote:

>
>MPI_Comm_validate_all, according to the proposal at [1], must "either
>complete successfully everywhere or return some error everywhere."  Is
>this possible to guarantee?  What about process failures during the call?
> Consider the last message sent in the protocol.  If the process sending
>that message dies just before sending it, the receiver will not know
>whether to return success or failure.
>
>I think that the best we can do is say that the outcount and list of
>collectively-detected dead processes will be the same at all processes
>where the call completed successfully.
>
>Or is there a trick I'm missing?
>
>Thanks,
>-d
>
>[1] 
>https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/ft/run_through_stabiliza
>tion#CollectiveValidationOperations
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