Vendor MPI tricks

• Tune short message length to avoid handshake at reasonable message lengths.

  • IBM SP setenv MP_EAGERLIMIT 16384
  • SGI O2K dplace -data_pagesize 64k
  • SUN E10000 setenv MPI_SHORTMSGSIZE 16384
  • Similar options on MPICH and LAM

• SGI O2K setenv MPI_NAP 1

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