Performance Characterization and Optimization of Parallel I/O on the Cray XT

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Provided by: Oak Ridge National Laboratory
Topic: Storage
Format: PDF
In this paper, the authors present an extensive characterization, tuning, and optimization of parallel I/O on the Cray XT supercomputer, named Jaguar, at Oak Ridge National Laboratory. They 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. Their analysis covers both data- and metadata-intensive I/O patterns. In particular, for small, non-contiguous data intensive I/O on Jaguar, they have evaluated several parallel I/O techniques, such as data sieving and two-phase collective I/O, and shed light on their effectiveness.
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