SC is the International Conference for
 High Performnance Computing, Networking, Storage and Analysis

SCHEDULE: NOV 13-19, 2010

Scaling Hierarchical N-Body Simulations on GPU Clusters

SESSION: GPGPU Performance


TIME: 1:30PM - 2:00PM

SESSION CHAIR: Gerhard Wellein

AUTHOR(S):Pritish Jetley, Lukasz Wesolowski, Filippo Gioachin, Laxmikant V. Kale, Thomas R. Quinn


This paper focuses on the use of clusters of use of GPGPU-based clusters for hierarchical N-body simulations. Whereas the behavior of these hierarchical methods has been studied in the past on CPU-based architectures, we investigate key performance issues in the context of clusters of GPUs. These include kernel organization and efficiency, the balance between tree traversal and force computation work, grain size selection through the tuning of offloaded work request sizes, and the reduction of sequential bottlenecks. The effect of various application parameters is modeled and experiments are carried out to quantify gains in performance. Our studies are carried out in the context of a production-quality parallel cosmological simulator called ChaNGa. We highlight the re-engineering of the application to make it more suitable for GPU-based environments. Finally, we present scaling performance results from experiments on the NCSA Lincoln GPU cluster.

Chair/Author Details:

Gerhard Wellein (Chair) - Erlangen Regional Computing Center

Pritish Jetley - University of Illinois at Urbana-Champaign

Lukasz Wesolowski - University of Illinois at Urbana-Champaign

Filippo Gioachin - University of Illinois at Urbana-Champaign

Laxmikant V. Kale - University of Illinois at Urbana-Champaign

Thomas R. Quinn - University of Washington

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The full paper can be found in the ACM Digital Library and IEEE Computer Society

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