SC Conference - Activity Details

Scientific Application-based Performance Comparison of SGI Altix 4700, IBM POWER5+, and SGI Altix ICE 8200 Supercomputers

Subhash Saini  (NASA Ames Research Center)
Dale Talcott  (NASA Ames Research Center)
Dennis Jespersen  (NASA Ames Research Center)
Jahed Djomehri  (NASA Ames Research Center)
Haoqiang Jin  (NASA Ames Research Center)
Rupak Biswas  (NASA Ames Research Center)
Papers Session
HPC Systems
Tuesday,  11:30AM - 12:00PM
Room Ballroom F
The suitability of next-generation high-performance computing systems for petascale simulations will depend on various performance factors attributable to processor, memory, local and global network, and input/output characteristics. In this paper, we evaluate performance of new dual-core SGI Altix 4700, quad-core SGI Altix ICE 8200, and dual-core IBM POWER5+ systems. To measure performance, we used microbenchmarks from High Performance Computing Challenge, NAS Parallel Benchmarks (NPB), and four real world applications, three from computational fluid dynamics and one from climate modeling. We used the microbenchmarks to develop a controlled understanding of individual system components, then analyzed and interpreted performance of the NPBs and applications. We also explored the hybrid programming model (MPI+OpenMP) using multizone NPBs and the CFD application OVERFLOW-2. Achievable application performance is compared across the systems. For the ICE platform, we also investigated the effect of memory bandwidth on performance by testing 1, 2, 4 and 8 cores per node.
The full paper can be found in the IEEE Xplore Digital Library and ACM Digital Library
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