On 21 July 2014 13:50, Jed Brown <j...@jedbrown.org> wrote:
>
> Must have been prior to MPI-2.1.  Shall we test for MPI_Pack_external
> and use MPI-IO by default if it's available?

Be prepared to file tickets for MPICH and OpenMPI.
Pack/unpack_external with MPI_DOUBLE never worked for me:
https://bitbucket.org/mpi4py/mpi4py/src/master/test/test_pack.py#cl-105


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Lisandro Dalcin
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