MPI get/put

• For codes that are latency sensitive, try using one-sided MPI (get/put).
• latency over NUMAlink on O3000:
  • send/recv: 5 microseconds
  • mpi_get: 0.7 microseconds
• if portability isn’t an issue use SHMEM instead
  • shmem_get latency: 0.5 microseconds (estimate by MPT group)
  • much easier to write code

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