sponsored byACMIEEE The International Conference for High Performance 
Computing, Networking, Storage and Analysis
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SCHEDULE: NOV 15-20, 2015

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Evaluating DVFS and Concurrency Throttling on IBM's Power8 Architecture

SESSION: Regular & ACM Student Research Competition Poster Reception

EVENT TYPE: Posters, Receptions, ACM Student Research Competition

EVENT TAG(S): HPC Beginner Friendly, Regular Poster

TIME: 5:15PM - 7:00PM

SESSION CHAIR(S): Michela Becchi, Manish Parashar, Dorian C. Arnold

AUTHOR(S):Wei Wang, Edgar A. Leon

ROOM:Level 4 - Lobby


Two of the world’s next-generation of supercomputers at the U.S. national laboratories will be based on IBM’s Power architecture. Early insights of how this architecture impacts applications are beneficial to attain the best performance. In this work, we investigate the effects of DVFS and thread concurrency throttling on the performance of applications for an IBM OpenPower, Power8 system. We apply these techniques dynamically on a per region basis to three HPC codes: miniFE, LULESH, and Graph500. Our empirical results offer the following insights. First, concurrency throttling provides significant performance improvements. Second, 4-way simultaneous multi-threading (SMT) performs as well as 8-way SMT with potential gains in power-efficiency. And, third, applying informed frequency and concurrency throttling combinations on memory-bound regions results in greater performance and energy efficiency.

Chair/Author Details:

Michela Becchi, Manish Parashar, Dorian C. Arnold (Chair) - University of Missouri|Rutgers University|University of New Mexico|

Wei Wang - University of Delaware

Edgar A. Leon - Lawrence Livermore National Laboratory

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