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RIOT - a parallel input/output tracer
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Wright, Steven A., Pennycook, Simon J., Hammond, Simon D. and Jarvis, Stephen A. (2011) RIOT - a parallel input/output tracer. In: Proceedings of the UK Performance Engineering Workshop (UKPEW'11), Bradford, United Kingdom, 7-8 July, 2011
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Official URL: http://www.inf.brad.ac.uk/ukpew11/
Abstract
Input/output (I/O) operations can represent a significant proportion of the run-time when large scientific applications are run in parallel. Although there have been advances in the form of file-format libraries, file-system design and I/O hardware, a growing divergence exists between the performance of parallel file-systems and compute processing rates. The effect is often a bottleneck when any form of file-system interaction is required. In this paper we present RIOT – an input/output tracing toolkit being developed at the University of Warwick for dynamic attachment to parallel applications. The two-stage tracing process includes a lightweight library to record I/O events and an in-depth post-execution analysis tool to extract performance metrics such as MPI-IO bandwidth, effective POSIX/file-system bandwidth, duration of individual or aggregated time spent in obtaining or releasing file locks and temporal information relating to parallel file activity. We present a case study on the use of RIOT for three standard industry I/O benchmarks: the BT-IO micro-application from NASA’s Parallel Benchmark suite, FLASH-IO, a benchmark which replicates the check-pointing operations of the FLASH thermonuclear star modelling code and IOR, an industry standard I/O benchmark using HDF-5 and MPI-IO. Furthermore, we utilise RIOT to assess these codes when running with the Parallel Log-structured File System (PLFS) middleware developed by the Los Alamos National Laboratory.
| Item Type: | Conference Item (Paper) |
|---|---|
| Subjects: | Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software |
| Divisions: | Faculty of Science > Computer Science |
| Date: | 7 July 2011 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Conference Paper Type: | Paper |
| Title of Event: | Proceedings of the UK Performance Engineering Workshop (UKPEW'11) |
| Type of Event: | Workshop |
| Location of Event: | Bradford, United Kingdom |
| Date(s) of Event: | 7-8 July, 2011 |
| Related URLs: | |
| URI: | http://wrap.warwick.ac.uk/id/eprint/45694 |
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