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From: bhoughto@pima.intel.com (Blair P. Houghton)
Newsgroups: comp.unix.internals
Subject: Unix-Math 101 (Re: Come on wizards)
Keywords: Ha Ha Ha Ha Ha..Wizards
Message-ID: <1540@inews.intel.com>
Date: 1 Jan 91 22:02:29 GMT
References: <1990Dec30.004638.12910@oswego.Oswego.EDU> <1991Jan1.144134.18631@agate.berkeley.edu>
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In article <1991Jan1.144134.18631@agate.berkeley.edu> shipley@remarque.berkeley.edu (Pete Shipley) writes:
>In article <1990Dec30.004638.12910@oswego.Oswego.EDU> faex0000@penelope.Oswego.EDU (Brian (BJT) Talamo) writes:
>Yes,  WHAT WIZARDS!!!!!
>
>What do you want us to write about?

How about "priority calculations I have seen."  The only
two for which I've seen the formulae have been those in
Bach's and Leffler's books, and they don't describe
accurately the priority schemes on any UNIX-alike I've
used, including Ultrix, Umax, SunOS, Aegis/Domain-OS, and
whatever it's called on SGI's Iris workstations.

Most importantly, the "nice-value" (p_nice, set using
nice(1) or renice(8)) has so very little weight in the
actual priority after a very few seconds of CPU time in
vanilla SysV or BSD (see Bach or Leffler to see what I
mean) that it's almost useless as a prioritizing measure.
Are other Unix variants' priority calculations more heeding
of the "nice-value"?

				--Blair
				  "What was it worth and
				   when was it worth that?"