Design and Implementation of Key Proposed MPI-3 One-Sided Communication Semantics on InfiniBand

摘要

As part of the MPI-3 effort, Remote Memory Access (RMA) working group has proposed several extensions to the one-sided communication interface. These extensions promise to address several of its existing limitations. However, their performance advantages need to be clearly highlighted for widespread acceptance of the new interface. In this paper, we present design and implementation of some of the key one-sided semantics proposed for MPI-3 over InfiniBand, using the MVAPICH2 library. Our evaluation shows that the newly proposed Flush semantics allow for more efficient handling of completions and the request-based operations can help achieve close to optimal overlap in a Get-Compute-Put model.