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Subject: [OMPI devel] MPI_Pack & MPI_Unpack Performance
From: Rayson Ho (raysonlogin_at_[hidden])
Date: 2010-05-19 10:31:06

In the MPITypes paper (Processing MPI Datatypes Outside MPI), page 7:

Test: Vector
Element type: float
MPICH2: 1788.85 MB/sec
OpenMPI: 1088.01 MB/sec <- *
MPITypes: 1789.37 MB/sec
Manual Copy: 1791.59 MB/sec

Test: YZ Face
Element type: float
MPICH2: 145.32 MB/sec
OpenMPI: 93.08 MB/sec <- *
MPITypes: 145.32 MB/sec
Manual Copy: 143.68 MB/sec

Size: 0.25 MB
Extent:63.99 MB

The paper can be downloaded at:

Is anyone working on this performance issue, or has it been fixed
already?? If not, I will check with the authors and try to get the
source code of the benchmark...