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Characterizing and predicting the I/O performance of HPC applications using a parameterized synthetic benchmark

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3 Author(s)
Hongzhang Shan ; CRD/NERSC, Lawrence Berkeley Nat. Lab., Berkeley, CA, USA ; Antypas, K. ; Shalf, J.

The unprecedented parallelism of new supercomputing platforms poses tremendous challenges to achieving scalable performance for I/O intensive applications. Performance assessments using traditional I/O system and component benchmarks are difficult to relate back to application I/O requirements. However, the complexity of full applications motivates development of simpler synthetic I/O benchmarks as proxies to the full application. In this paper we examine the I/O requirements of a range of HPC applications and describe how the LLNL IOR synthetic benchmark was chosen as suitable proxy for the diverse workload. We show a procedure for selecting IOR parameters to match the I/O patterns of the selected applications and show it can accurately predict the I/O performance of the full applications. We conclude that IOR is an effective replacement for full-application I/O benchmarks and can bridge the gap of understanding that typically exists between stand-alone benchmarks and the full applications they intend to model.

Published in:

High Performance Computing, Networking, Storage and Analysis, 2008. SC 2008. International Conference for

Date of Conference:

15-21 Nov. 2008

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