A Performance Instrumentation Framework to Characterize Computation-Communication Overlap in Message-Passing Systems

Effective overlap of computation and communication is a well understood technique for latency hiding and can yield significant performance gains for applications on high-end computers. In this paper, we propose an instrumentation framework for message-passing systems to characterize the degree of overlap of communication with computation in the execution of parallel applications. The inability to obtain precise time-stamps for pertinent communication events is a significant problem, and is addressed by generation of minimum and maximum bounds on achieved overlap. The overlap measures can aid application developers and system designers in investigating scalability issues. The approach has been used to instrument two MPI implementations as well as the ARMCI system. The implementation resides entirely within the communication library and thus integrates well with existing approaches that operate outside the library. The usefulness of the framework is shown by analyzing available overlap ...

• Type: Conference
• Year: 2006
• Where: CLUSTER
• Authors: Aniruddha G. Shet, P. Sadayappan, David E. Bernholdt, Jarek Nieplocha, Vinod Tipparaju
• Keywords: CLUSTER 2006, Communication, Distributed And Parallel Computing, Effective Overlap, Overlap Measures