Point-to-point operations over an intercommunicator go from the caller (in the local group) to some process in the remote group. So isn't it sufficient to say that the group returned by MPI_Comm_reenable_any_source() using an intercommunicator is representative of the failures in the remote group? We do a similar trick for MPI_Comm_validate(). So the failures in the local group in relation to the point-to-point operations for an intercommunicator do not matter when reenabling ANY_SOURCE receives since two processes in the local group cannot use that intercommunicator to communicate with one another. If the user needs to know the failures in the local group they can use the separate accessor function for it, MPI_Comm_group_failed(). Do you think that is sufficient functionality for the user? Good point though, we need to clarify this in the text. -- Josh On Fri, Dec 9, 2011 at 5:32 PM, Sur, Sayantan <[email protected]> wrote:

...

-----Original Message----- From: [email protected] [mailto:mpi3-ft- [email protected]] On Behalf Of Darius Buntinas Sent: Friday, December 09, 2011 2:22 PM To: MPI 3.0 Fault Tolerance and Dynamic Process Control working Group Subject: [Mpi3-ft] reenable_anysource

We've proposed MPI_Comm_reenable_anysource that returns a group containing the failed processes known to the process at the time of the failure.

Don't we need another function for intercommunicators that returns two groups of failed processes: one for the local group and another for the remote group?

MPI_Comm_reenable_anysource_inter? (now we're definitely over 30 characters).

Yes, but as long as it is < 140 characters, do we really care? I mean, we could still tweet about the function ;)

(sorry, couldn't resist)

How about we have the same name and have some arg ignored?

MPI_Comm_reenable_anysource(comm, failed_local_group, failed_remote_group)

With failed_remote_group only valid if comm is inter? Or does that violate some naming convention?

...

-d

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-- Joshua Hursey Postdoctoral Research Associate Oak Ridge National Laboratory http://users.nccs.gov/~jjhursey