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Performance characterization and optimization of parallel I/O on the Cray XT

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3 Author(s)
Weikuan Yu ; Oak Ridge Nat. Lab., Oak Ridge, TN ; Vetter, J.S. ; Oral, H.S.

This paper presents an extensive characterization, tuning, and optimization of parallel I/O on the Cray XT supercomputer, named Jaguar, at Oak Ridge National Laboratory. We have characterized the performance and scalability for different levels of storage hierarchy including a single Lustre object storage target, a single S2A storage couplet, and the entire system. Our analysis covers both data- and metadata-intensive I/O patterns. In particular, for small, non-contiguous data- intensive I/O on Jaguar, we have evaluated several parallel I/O techniques, such as data sieving and two- phase collective I/O, and shed light on their effectiveness. Based on our characterization, we have demonstrated that it is possible, and often prudent, to improve the I/O performance of scientific benchmarks and applications by tuning and optimizing I/O. For example, we demonstrate that the I/O performance of the S3D combustion application can be improved at large scale by tuning the I/O system to avoid a bandwidth degradation of 49% with 8192 processes when compared to 4096 processes. We have also shown that the performance of Flash I/O can be improved by 34% by tuning the collective I/O parameters carefully.

Published in:

Parallel and Distributed Processing, 2008. IPDPS 2008. IEEE International Symposium on

Date of Conference:

14-18 April 2008