Article View: comp.unix.cray
Article #226Re: Summary for Protection in Cray
From: Dik T. Winter
Date: Fri, 18 Jan 1991 14:59
Date: Fri, 18 Jan 1991 14:59
15 lines
1296 bytes
1296 bytes
In article <DREIER.91Jan13223533@husc9.harvard.edu> dreier@husc9.harvard.edu (Roland Dreier) writes: > I guess one thing that should be noted about how Crays handle memory: under > Unicos, since it lacks virtual memory, whole jobs get swapped. What this > means is that if I'm running two jobs on a 256 megaword machine and each of > them wants 129 megawords of memory, every time a job gets swapped out, I > have to do 129 megawords of IO, rather than just the small amount of overlap > that I "really" have to do; so clearly, even a slightly slower virtual memory > system would be at an advantage here. > But this is not a defect of the lack of VM; it is a defect of the OS. If the OS wants to swap out the complete job it can do so, but it is not necessary. -- dik t. winter, cwi, amsterdam, nederland dik@cwi.nl
Technical Details
Message-ID:
<2825@charon.cwi.nl>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!mcsun!hp4nl!charon!dikReferences:
<1991Jan10.230715.404@agate.berkeley.edu> <1892@sun13.scri.fsu.edu> <DREIER.91Jan13223533@husc9.harvard.edu>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!mcsun!hp4nl!charon!dik From: dik@cwi.nl (Dik T. Winter) Newsgroups: comp.unix.cray Subject: Re: Summary for Protection in Cray Message-ID: <2825@charon.cwi.nl> Date: 18 Jan 91 14:59:38 GMT References: <1991Jan10.230715.404@agate.berkeley.edu> <1892@sun13.scri.fsu.edu> <DREIER.91Jan13223533@husc9.harvard.edu> Sender: news@cwi.nl Organization: CWI, Amsterdam Lines: 15