Article View: comp.sys.super
Article #447Re: Massively Parallel LINPACK on the Intel Touchstone Delta machine
From: John Prentice
Date: Mon, 10 Jun 1991 23:55
Date: Mon, 10 Jun 1991 23:55
22 lines
1624 bytes
1624 bytes
In article <1991Jun10.144354.695@chpc.utexas.edu> gary@chpc.utexas.edu (Gary Smith) writes: > >Using Speedup(f,p) = 1/[(1-f)+(f/p)], with f being the fraction of code >parallelized and p being the number of processors, and unrealistically >assuming no overhead, a speedup of 64000 using 65536 processors requi- >res that the problem be 99.9999634% parallel. How many problems do you >know of that are that parallel? > Very few. But this misses the central question. If we are going to even get a factor of 100 speedup in the new few years, how else are we going to do it other than by use of massive parallelism? If there is an alternative, I would be overjoyed to know about it. I don't particularly find parallel computing fun and it is not particularly easy, but I just don't see any alternative. That it has limitations, so what? The question still remains, what is the alternative? John -- John K. Prentice john@spectre.unm.edu (Internet) Computational Physics Group Amparo Corporation, Albuquerque, NM
Technical Details
Message-ID:
<1991Jun10.235501.7039@ariel.unm.edu>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!news.cs.indiana.edu!ariel.unm.edu!spectre.unm.edu!johnReferences:
<1991Jun6.144903.20456@chpc.utexas.edu> <1991Jun06.205144.22611@ariel.unm.edu> <1991Jun10.144354.695@chpc.utexas.edu>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!news.cs.indiana.edu!ariel.unm.edu!spectre.unm.edu!john From: john@spectre.unm.edu (John Prentice) Newsgroups: comp.sys.super Subject: Re: Massively Parallel LINPACK on the Intel Touchstone Delta machine Message-ID: <1991Jun10.235501.7039@ariel.unm.edu> Date: 10 Jun 91 23:55:01 GMT References: <1991Jun6.144903.20456@chpc.utexas.edu> <1991Jun06.205144.22611@ariel.unm.edu> <1991Jun10.144354.695@chpc.utexas.edu> Organization: Dept. of Math & Stat, University of New Mexico, Albuquerque Lines: 22