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SCHEDULE: NOV 16-21, 2014
When viewing the Technical Program schedule, on the far righthand side is a column labeled "PLANNER." Use this planner to build your own schedule. Once you select an event and want to add it to your personal schedule, just click on the calendar icon of your choice (outlook calendar, ical calendar or google calendar) and that event will be stored there. As you select events in this manner, you will have your own schedule to guide you through the week.
Nonblocking Epochs in MPI One-Sided Communication
SESSION: MPI
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
ROOM:393-94-95
ABSTRACT:
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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