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DOE OSTI · 1392898

IOPro: a parallel I/O profiling and visualization framework for high-performance storage systems

Kim, Seong Jo·Zhang, Yuanrui·Son, Seung Woo·Kandemir, Mahmut·Liao, Wei-keng·Thakur, Rajeev·Choudhary, Alok
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Abstract

Efficient execution of large-scale scientific applications requires high-performance computing systems designed to meet the I/O requirements. To achieve high-performance, such data-intensive parallel applications use a multi-layer layer I/O software stack, which consists of high-level I/O libraries such as PnetCDF and HDF5, the MPI library, and parallel file systems. To design efficient parallel scientific applications, understanding the complicated flow of I/O operations and the involved interactions among the libraries is quintessential. Such comprehension helps identify I/O bottlenecks and thus exploits the potential performance in different layers of the storage hierarchy. To profile the performance of individual components in the I/O stack and to understand complex interactions among them, we have implemented a GUI-based integrated profiling and analysis framework, IOPro. IOPro automatically generates an instrumented I/O stack, runs applications on it, and visualizes detailed statistics based on the user-specified metrics of interest. We present experimental results from two different real-life applications and show how our framework can be used in practice. By generating an end-to-end trace of the whole I/O stack and pinpointing I/O interference, IOPro aids in understanding I/O behavior and improving the I/O performance significantly.

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97 MATHEMATICS AND COMPUTING

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Kim, Seong Jo, Zhang, Yuanrui, Son, Seung Woo, Kandemir, Mahmut, Liao, Wei-keng, Thakur, Rajeev, Choudhary, Alok. 2014-11-22. IOPro: a parallel I/O profiling and visualization framework for high-performance storage systems. https://doi.org/10.1007/s11227-014-1329-0

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