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Characterizing One-/Two-Sided Designs in OpenSHMEM Collectives

DescriptionOpenSHMEM is a widely used Partitioned Global Address Space (PGAS) programming model in the HPC community. The latest OpenSHMEM Specification v1.5 introduced the team concept and team-based collective communication that are similar to the communicator and collective communication in the Message Passing Interface (MPI) programming model. However, the typical design of OpenSHMEM collectives relies on one-sided communication such as PUT and Get to move the data, which is different from two-sided communication in MPI collectives. In this work, we compare OpenSHMEM collective designs using native one-sided communication and MPI-based two-sided communication on an HPC cluster. We characterize two aspects (i.e., synchronization and collective algorithms) that can influence the performance of these two different designs and use benchmarks to show the performance differences. Through our evaluation, we find that the MPI-based design is faster than the one-sided design at most times, while the one-sided design can perform faster in certain cases.

Authors

Yuke Li

University of California, Merced