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Subject: [OMPI devel] Cost for AllGatherV() Operation
From: Tim Stitt (tstitt_at_[hidden])
Date: 2010-10-29 15:42:11

Dear OpenMPI Developers,

I would be grateful if someone could briefly describe the cost
(complexity) for the allgatherv() collective operation in the current
release of OpenMPI.

For MPICH2 I believe the cost is ceiling(lg p). Can anyone comment on
the algorithms and cost used in the OpenMPI implementation?

Thanks in advance,