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2004
Springer

Minimizing Synchronization Overhead in the Implementation of MPI One-Sided Communication

10 years 9 months ago
Minimizing Synchronization Overhead in the Implementation of MPI One-Sided Communication
The one-sided communication operations in MPI are intended to provide the convenience of directly accessing remote memory and the potential for higher performance than regular point-to-point communication. Our performance measurements with three MPI implementations (IBM MPI, Sun MPI, and LAM) indicate, however, that one-sided communication can perform much worse than point-to-point communication if the associated synchronization calls are not implemented efficiently. In this paper, we describe our efforts to minimize the overhead of synchronization in our implementation of one-sided communication in MPICH-2. We describe our optimizations for all three synchronization mechanisms defined in MPI: fence, post-start-complete-wait, and lock-unlock. Our performance results demonstrate that, for short messages, MPICH-2 performs six times faster than LAM for fence synchronization and 50% faster for post-start-complete-wait synchronization, and it performs more than twice as fast as Sun MPI fo...
Rajeev Thakur, William D. Gropp, Brian R. Toonen
Added 02 Jul 2010
Updated 02 Jul 2010
Type Conference
Year 2004
Where PVM
Authors Rajeev Thakur, William D. Gropp, Brian R. Toonen
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