*BSD News Article 18337


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From: ig25@fg70.rz.uni-karlsruhe.de (Thomas Koenig)
Newsgroups: comp.os.linux,comp.os.386bsd.questions,comp.windows.x.i386unix
Subject: Re: SUMMARY: 486DX2/66 for Unix conclusions (fairly long)
Date: 13 Jul 93 13:44:01 GMT
Organization: University of Karlsruhe, Germany
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References: <21k903$3q4@GRAPEVINE.LCS.MIT.EDU> <PCG.93Jul12003233@decb.aber.ac.uk> <JOHNSONM.93Jul12091953@calypso.oit.unc.edu> <1993Jul12.182304@informatik.uni-kl.de>
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gerbes@informatik.uni-kl.de (Timo Gerbes - DA Thomas) writes:

> swapping means that the os is determing some overload and sends some
> processes to sleep.  to choose the right sleepers it must obtain the
> "working-set" so that >he remaining processes will do their work
> WITHOUT heavy paging.  when you have many independent processes you get
> better performance than just "pure" paging.

Of course, swapped - out processes better had not be interactive, or
users will complain very loudly about response time.  An operating
system which does stuff like that had better distinguish between
interactive and batch jobs; I'm not aware of any UNIX variant which
actually does so.  I know MVS does, and I'm pretty sure VMS does, too.
-- 
Thomas Koenig, ig25@rz.uni-karlsruhe.de, ig25@dkauni2.bitnet
The joy of engineering is to find a straight line on a double
logarithmic diagram.