[mpi-21] Ballot 4 - Re: Re: SEND COUNT and RECEIVE COUNT
rabenseifner at [hidden]
Mon Jan 28 08:44:19 CST 2008
please can you forward this to Yukiya Aoyama <aoyama_at_...>,
the originator of this track.
This is a proposal for MPI 2.1, Ballot 4.
This is a follow up to:
Description of the send and receive count arguments to MPI_Alltoallv
with mail discussion in
Based on the questions for clarification, I propose not to include
any further clarification into the standard.
MPI-1, Sect. 4.8, MPI_ALLTOALLV, page 112, lines 37-40 clearly states:
"The type signature associated with sendcount[j], sendtype at
process i must be equal to the type signature associated with
recvcount[i], recvtype at process j. This implies that the amount
of data sent must be equal to the amount of data received, pairwise
between every pair of processes. Distinct type maps between sender
and receiver are still allowed."
The same text is also used for
MPI-2.0, Sect. 7.3.5 MPI_ALLTOALLW, page 165, lines 42-45.
Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner_at_[hidden]
High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
Nobelstr. 19, D-70550 Stuttgart, Germany . (Office: Allmandring 30)
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