From: utzoo!decvax!cca!hplabs!hao!pag@sri-unix
Newsgroups: net.unix-wizar
Title: Re: automatic niceing by kernel - (nf)
Article-I.D.: hao.351
Posted: Tue Nov 23 12:50:24 1982
Received: Thu Nov 25 03:38:50 1982
References: pur-phy.585

My implementation of kernel autonice'ing has the following features:
1.  UID 0 and sticky text procs are unaffected.
2.  nice value increases with accumulated cpu time (up to a maximum
    of 50).
3.  Autonice'ing is load-based, ie, the higher the load the quicker
    the nice value increases.
4.  When the load average is above a given crital point (8.0 currently),
    procs with priority > PBAD (approx = nice of 15) are swapped out,
    and cannot return until the load drops to a more acceptable level
    (5.0 currently).

This has worked out very well on our heavily loaded 11/70 -- allowing
interactive jobs to run at an effective higher priority than crunchers
(which, if they accumulate enought cpu time, only run when the cpu
would otherwise have been idle).

--peter gross
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