A Comparison of Logical and Physical Parallel I/o pAtterns
- 1 September 1998
- journal article
- research article
- Published by SAGE Publications in The International Journal of High Performance Computing Applications
- Vol. 12 (3) , 364-380
- https://doi.org/10.1177/109434209801200305
Abstract
Although there are several extant studies of parallel scien tific application request patterns, there is little experimen tal data on the correlation of physical I/O patterns with application I/O stimuli. To understand these correlations, the authors have instrumented the SCSI device drivers of the Intel Paragon OSF/1 operating system to record key physical I/O activities, and have correlated this data with the I/O patterns of scientific applications captured via the Pablo analysis toolkit. This analysis shows that disk hard ware features profoundly affect the distribution of request delays and that current parallel file systems respond to parallel application I/O patterns in nonscalable ways.Keywords
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