文件名称:
IJPP-2009.pdfA Speculative and Adaptive MPI Rendezvous Protocol Over RDMA-enable
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上传时间: 2020-05-23
详细说明：Overlappingcomputationwithcommunicationisakeytechniquetoconceal the effect of communication latency on the performance of parallel applications. Message Passing Interface (MPI) is a widely used message passing standard for high performance computing. One of the most important factors in achieving a good level of overlap is the MPI ability to make progress on outstanding communication operations. In this paper, we propose a novel speculative MPI Rendezvous protocol that uses RDMA Read and RDMA Write to effectively improve communication progress and consequently the overlap ability. Performance results based on a modified MPICH2 implementation over 10-Gigabit iWARP Ethernet reveal a significant (80–100%) improvement in receiver side overlap and progress ability. We have also observedupto30%improvementinapplicationwaittimeforsomeNPBapplications as well as the RADIX application. For applications that do not benefit from this protocol, an adaptation mechanism is used to stop the speculation to effectively reduce the protocol overhead.
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