Article View: comp.sys.sgi.misc
Article #103Re: Where does the CPU go, when its not doing nuthin' (gr_osview)
From: Jim Patterson
Date: Thu, 31 Dec 1992 00:02
Date: Thu, 31 Dec 1992 00:02
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: I have been running a structural analysis finite element code on a 4d35 with
: similar problems. I was the only user on the machine but could get no more
: than about 60% of the CPU. I too attributed this to disk accesses but when
: we upgraded our memory from 16mb to 48mb, I found that I could get about 95%
: of the CPU!
: I wonder if Dave Olson could explain that?
Your process was too big for physical memory, so it was doing a lot of
swapping to disk. Once you got enough memory you didn't need to swap
and the disk access went away (and the process worked a lot faster)
Jim
--
James Patterson photon!jhp@ucsd.edu jhp@photon.com
Photon Research Associates 619-455-9741 (voice) 619-546-3903 (fax)
"... three great virtues of a programmer: laziness,impatience and hubris "
Larry Wall in _Programming Perl_
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Newsgroups: comp.sys.sgi.misc Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!swrinde!sdd.hp.com!ncr-sd!crash!photon.photon.com!jhp From: jhp@photon.com (Jim Patterson) Subject: Re: Where does the CPU go, when its not doing nuthin' (gr_osview) Message-ID: <1992Dec31.000257.19671@photon.com> Sender: usenet@photon.com (Usenet dummy users) Reply-To: jhp@photon.com Organization: Photon Research Associates, Inc. X-Newsreader: TIN [version 1.1 PL6] References: <1hsmkiINNf05@rave.larc.nasa.gov> Date: Thu, 31 Dec 1992 00:02:57 GMT Lines: 19