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Subject: Re: [OMPI users] Intercommunicators Collective Communciation
From: Jeff Squyres (jsquyres) (jsquyres_at_[hidden])
Date: 2014-05-10 06:02:09

On May 9, 2014, at 8:34 PM, Spenser Gilliland <spenser_at_[hidden]> wrote:

> Thanks for the quick response. I'm having alot of fun learning MPI and this mailing list has been invaluable.
> So, If I do a scatter on an inter communicator will this use all left process to scatter on all right processes?

Yes. And vice versa (simultaneously). See the official description of MPI_SCATTER, including its definition for what happens on intercommunicators in the MPI-3.0 document:

The description for MPI_SCATTER starts on p159.

Jeff Squyres
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