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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.
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