sponsored byIEEEACMThe International Conference for High Performance 
Computing, Networking, Storage and Analysis
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SCHEDULE: NOV 16-21, 2014

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Nonblocking Epochs in MPI One-Sided Communication


EVENT TYPE: Papers, Best Paper Finalists

TIME: 10:30AM - 11:00AM

SESSION CHAIR: Ron Brightwell

AUTHOR(S):Judicael A. Zounmevo, Xin Zhao, Pavan Balaji, William Gropp, Ahmad Afsahi



The synchronization model of the MPI one-sided communication paradigm can lead to serialization and latency propagation. For instance, a process can propagate non RMA communication-related latencies to remote peers waiting in their respective epoch-closing routines in matching epochs.
In this work, we discuss six latency issues that were documented for MPI-2.0 and show how they evolved in MPI-3.0. Then, we propose entirely non-blocking RMA synchronizations that allow processes to avoid waiting even in epoch-closing routines. The proposal provides contention avoidance in communication patterns that require back-to-back RMA epochs. It also fixes the aforementioned
latency propagation issues. It finally allows the MPI progress engine to orchestrate aggressive scheduling to cut down the overall completion time of sets of epochs without introducing memory consistency hazards. Our test results show noticeable performance improvements for a Lower-Upper matrix decomposition as well as an application pattern that performs massive atomic updates.

Chair/Author Details:

Ron Brightwell (Chair) - Sandia National Laboratories

Judicael A. Zounmevo - Argonne National Laboratory

Xin Zhao - University of Illinois at Urbana-Champaign

Pavan Balaji - Argonne National Laboratory

William Gropp - University of Illinois at Urbana-Champaign

Ahmad Afsahi - Queen's University

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Paper provided by the ACM Digital Library

Paper also available from IEEE Computer Society