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Article #489Re: World's Most Powerful Computing Sites
From: Victor Eijkhout
Date: Sat, 23 Jan 1993 16:43
Date: Sat, 23 Jan 1993 16:43
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1848 bytes
In article <1993Jan22.015827.26653@nas.nasa.gov> fineberg@wilbur.nas.nasa.gov (Samuel A. Fineberg) writes: I don't know too many people that write assembly code, and that is what you need to do to get 35 MFLOPs. As far as I'm concerned, assembly coded benchnmarks are useless. Assembly coded benchmarks, maybe. But the BLAS routines (Basic Linear Algebra Subroutines) exist on many machines in assembler, and precisely because they are 1/ standardized across all platforms 2/ optimized for each, you can write real programs in Fortran or C, with a reasonable speed if you need the BLAS often enough. Just interface your program to assembler *kernels*. I know of people who write distributed memory linear system solvers, that get over 50% performance out of *500 i860's* using those assembler BLAS. -- Victor Eijkhout ................................ `There are also a few bugs, Department of Computer Science .......... though not as many as I've come to University of Tennessee ............... expect in new [MS]Windows products.' Knoxville TN 37919 ................................ (from a software review)
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arc1-ca.pugleaf.net!sparky!uunet!pmafire!news.dell.com!natinst.com!cs.utexas.edu!uwm.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!gatech!emory!cs.utk.edu!cs.utk.edu!eijkhoutReferences:
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Path: arc1-ca.pugleaf.net!sparky!uunet!pmafire!news.dell.com!natinst.com!cs.utexas.edu!uwm.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!gatech!emory!cs.utk.edu!cs.utk.edu!eijkhout From: eijkhout@cupid.cs.utk.edu (Victor Eijkhout) Newsgroups: comp.sys.super Subject: Re: World's Most Powerful Computing Sites Date: 23 Jan 93 16:43:14 Organization: /pearl/homes/eijkhout/.organization Lines: 23 Distribution: inet Message-ID: <EIJKHOUT.93Jan23164314@cupid.cs.utk.edu> References: <1993Jan20.232809.29241@nas.nasa.gov> <1993Jan21.165159.10149@meiko.com> <1993Jan22.015827.26653@nas.nasa.gov> NNTP-Posting-Host: cupid.cs.utk.edu In-reply-to: fineberg@wilbur.nas.nasa.gov's message of 22 Jan 93 01:58:27 GMT