SC12 Home > SC12 Schedule > SC12 Presentation - Looking Under the Hood of the IBM Blue Gene/Q Network

SCHEDULE: NOV 10-16, 2012

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Looking Under the Hood of the IBM Blue Gene/Q Network

SESSION: Networks

EVENT TYPE: Papers

TIME: 4:00PM - 4:30PM

SESSION CHAIR: Sadaf R. Alam

AUTHOR(S):Dong Chen, Anamitra Choudhury, Noel Eisley, Philip Heidelberger, Sameer Kumar, Amith Mamidala, Jeff Parker, Fabrizio Petrini, Yogish Sabharwal, Robert Senger, Swati Singhal, Steinmacher-Burow Burkhard, Yutaka Sugawara, Robert Walkup

ROOM:255-BC

ABSTRACT:
This paper explores the performance and optimization of the IBM Blue Gene/Q (BG/Q) five dimensional torus network on up to 16K nodes. The BG/Q hardware supports multiple dynamic routing algorithms and different traffic patterns may require different algorithms to achieve best performance. Between 85% to 95% of peak network performance is achieved for all-to-all traffic, while over 85% of peak is obtained for challenging bisection pairings. A new software-controlled hardware algorithm is developed for bisection traffic that achieves better performance than any individual hardware algorithm. To evaluate memory and network performance, the HPCC Random Access benchmark was tuned for BG/Q and achieved 858 Giga Updates per Second (GUPS) on 16K nodes. To further accelerate message processing, the message libraries on BG/Q enable the offloading of messaging overhead onto dedicated communication threads. Several applications, including Algebraic Multigrid (AMG), exhibit from 3 to 20% gain using communication threads.

Chair/Author Details:

Sadaf R. Alam (Chair) - Swiss National Supercomputing Centre

Dong Chen - IBM

Anamitra Choudhury - IBM

Noel Eisley - IBM

Philip Heidelberger - IBM

Sameer Kumar - IBM

Amith Mamidala - IBM

Jeff Parker - IBM

Fabrizio Petrini - IBM

Yogish Sabharwal - IBM

Robert Senger - IBM