Revealing the Performance of MPI RMA Implementations

13 years 10 months ago

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The MPI remote-memory access (RMA) operations provide a diﬀerent programming model from the regular MPI-1 point-to-point operations. This model is particularly appropriate for cases where there are multiple communication events for each synchronization and where the target memory locations are known by the source processes. In this paper, we describe a benchmark designed to illustrate the performance of RMA with multiple RMA operations for each synchronization, as compared with point-to-point communication. We measured the performance of this benchmark on several platforms (SGI Altix, Sun Fire, IBM SMP, Linux cluster) and MPI implementations (SGI, Sun, IBM, MPICH2, Open MPI). We also investigated the eﬀectiveness of the various optimization options speciﬁed by the MPI standard. Our results show that MPI RMA can provide substantially higher performance than point-topoint communication on some platforms, such as SGI Altix and Sun Fire. The results also show that many opportunities ...

William D. Gropp, Rajeev Thakur

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