NAS Parallel Benchmarks: Difference between revisions

Revision as of 00:54, 21 April 2011

Revision as of 14:48, 11 June 2011

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Since its release, NPB 1 displayed two major weaknesses. Firstly, due to its "paper-and-pencil" specification, computer vendors usually highly tuned their implementations so that their performance became difficult for scientific programmers to attain. Secondly, many of these implementation were proprietary and not publicly available, effectively concealing their optimizing techniques. Secondly, problem sizes of NPB 1 lagged behind the development of supercomputers as the latter continued to evolve.<ref name="nas95020"/>

NPB 2, released in 1996,<ref name="npb2.2">{{Citation

|last1=Saphir|first1=W.

|last2=van der Wijngaart|first2=R.

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|publisher=NASA Ames Research Center, Moffett Field, CA

|postscript=<!--none-->

}}</ref>, came with source code implementations for five out of eight benchmarks defined in NPB 1 to supplement but not replace NPB 1. It extended the benchmarks with an up-to-date problem size ''Class C''. It also amended the rules for submitting benchmarking results. The new rules included explicit requests for output files as well as modified source files and build scripts to ensure public availability of the modifications and reproducibility of the results.<ref name="nas95020"/>

NPB 2.2 contained implementations of two more benchmarks.<ref name="npb2.2"/> NPB 2.3 of 1997 was the first complete implemetationimplementation in [[Message Passing Interface|MPI]].<ref name="nas03002"/> It shipped with serial versions of the benchmarks consistent with the parallel versions and defined a problem size ''Class W'' for small-memory systems.<ref name="npbchanges">{{cite web

|title=NAS Parallel Benchmarks Changes

|url=http://www.nas.nasa.gov/Resources/Software/npb_changes.html