NDLI: An improvement of I/O function for auxiliary storage: parallel I/O for a large scale supercomputing

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An improvement of I/O function for auxiliary storage: parallel I/O for a large scale supercomputing

Content Provider	ACM Digital Library
Author	Itoh, Hiroshi Shibata, Takashi Nagashima, Umpei Nishimoto, Fumio Gotoh, Minoru
Abstract	New I/O technique for external auxiliary storage: magnetic disk unit, has been developed to improve the I/O performance on HITAC VOS3/ES1 with usual hardware architecture. Since the I/O technique is based on the idea that the sequence of I/O processes should be divided to some groups and be executed in parallel, and is quite similar to a pipeline on vector computer, we call it Parallel I/O (PIO).The PIO function has been realized and opened to end-users without any change to previous protocols.Comparison of actual performance of PIO with 16 degrees of parallelization (16 PIO), the speed of the PIO is about 26 times faster than the standard (sequential) I/O technique by using chained schedule function. In the case of 8 PIO, PIO is 13 times faster than the standard I/O technique. The efficiency of PIO correlates well with the degree of parallelization. Elapsed time is inversely proportional to the degree of parallelization. The change of acceleration ratio of PIO to the standard I/O is normally proportional to the degree of parallelization.The PIO is quite efficient for large scale supercomputing because I/O between external auxiliary storage and CPU is indispensable in large scale computations. Since the performance of I/O has not been improved, while the performance of supercomputer has made remarkable progress in CPU speed, I/O speed may become bottleneck for computations with supercomputers.
Starting Page	48
Ending Page	59
Page Count	12
File Format	PDF
ISBN	0897913698
DOI	10.1145/77726.255138
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1990-06-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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