Nice value worthless??? / Renice?
root at spdyne.UUCP
root at spdyne.UUCP
Fri Jan 27 09:17:00 AEST 1989
I have a question about the nice values of processes:
A few years ago, I was working on a VAX 11/730 running BSD 4.2. When
you would nice a process by say 2, you could tell the difference right away.
It too considerably more or less time to complete. A make niced to -20
would zip along (and everyone else would stop).
Now I'm running a Compaq 386/20, with (sorta slow drives (40ms)),
and only 3 Meg of ram. Microport UNIX with DOS-MERGE. (Sys V)
As far as I can tell, the nice value does absolutly nothing!
I have been running my makes +19 to allow other things to run and
I can't even page up/down in VI in under a few seconds.
It takes the same amount of time even if I nice -20, so what good does it
do?
One make kills the whole system. (or sending mail for that matter..
PS seems to bring things to a stop 80% of the time)
Is it just the way that Sys V works or is it just that I don't have
squat for ram? (Merge wants 2.6 Meg), Slow disks? (I know that the
CPU waits on the transfer - right?)
Also, Does anyone have a 'renice' for Sys V? I have one for BSD, but
of course it is worthless under Sys V.
-Chert Pellett
root at spdyne
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