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The HITAC S-820 is a family of vector supercomputers developed, manufactured and marketed by Hitachi.[1] Announced in July 1987, it was Hitachi's second supercomputer, succeeding the HITAC S-810. The S-820 is categorized as a second generation Japanese supercomputer.[1]
| Active | 1987 - |
|---|---|
| Memory | maximum 512MB |
| Speed | theoretical peak performance of 2 GFLOPS |
| Sources | [1] |
The S-820 system has both a scalar and vector processor, similar to the architecture of the S-810.[1][2] The scalar processor is based on the Hitachi M-series mainframe processor, so is compatible with its operating system.[1][2] The S-820 was reported to have a theoretical peak performance of 2 GFLOPS, and a theoretical maximum computational performance of 3 GFLOPS.[1]
Initially the S-820 was available in two variations: the S-820 model 80 and the S-820 model 60 (hereafter S-820/80 and S-820/60).[2] The S-820/80 had double the vector computational capability, as well as more storage capability, compared to the S-820/60.[2] The peak performance of the S-820/80 was 3 GFLOPS, and that of the S-820/60 as 1.5 GFLOPS.[2]
There were five models. The first two, the mid-range S-820/60 with a peak performance of 1.5 GFLOPS and the top-end S-820/80 with a peak performance of 3.0 GFLOPS, were announced in July 1987. These two models differ in the number of vector pipelines installed. In May 1988, the S-820/20 and S-820/40 were announced, followed by the S-820/15 in November 1989.[citation needed]
A team from the Institute for Supercomputing Research (Tokyo) and the Los Alamos National Laboratory benchmarked the S-820/80 against the similar generation NEC SX-2 and Cray X-MP/416, as well as the S-810, during early 1988.[1] They concluded that the S-820 was "a great deal faster in vector mode than any other supercomputer we have measured".[1]
See also
editReferences
edit- ^ a b c d e f g h Eoyang, C.; Mendez, R. H.; Lubeck, O. M. (1 January 1988). The birth of the second generation: The Hitachi S-820/80. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). pp. 296–303. doi:10.1109/SUPERC.1988.44666. ISBN 0-8186-0882-X. OSTI 6902360. Retrieved 15 September 2021.
{{cite book}}:|website=ignored (help) - ^ a b c d e Mendez, Raul H.; Orszag, Steven A., eds. (1988). Japanese Supercomputing: Architecture, Algorithms, and Applications. Springer-Verlag. p. 129. ISBN 978-0-387-96765-3. Retrieved 15 September 2021.