reduce priority of large port builds, e.g. firefox, gcc4x
Erich Dollansky
erichfreebsdlist at ovitrap.com
Wed Aug 29 14:07:49 UTC 2012
Hi,
On Wed, 29 Aug 2012 14:56:07 +0100 (BST)
Anton Shterenlikht <mexas at bristol.ac.uk> wrote:
> Is it possible to reduce priority
> of port building processes with
> something like "nice +19 make" (tcsh syntax)?
>
> Here's a typical scenario for a large build
> (actually building gcc-4.7 and firefox in parallel):
>
> last pid: 54736; load averages: 5.27, 5.38,
> 5.11 up 9+15:37:09 14:49:11 89 processes: 7
> running, 79 sleeping, 2 zombie, 1 waiting CPU 0: 19.9% user, 46.3%
> nice, 33.8% system, 0.0% interrupt, 0.0% idle CPU 1: 15.4% user,
> 39.7% nice, 44.9% system, 0.0% interrupt, 0.0% idle Mem: 1141M
> Active, 3853M Inact, 1097M Wired, 128K Cache, 823M Buf, 1914M Free
> Swap: 13G Total, 16K Used, 13G Free
>
> PID UID THR PRI NICE SIZE RES STATE C TIME WCPU
> COMMAND 54720 0 1 89 10 111M 102M RUN 1 0:04
> 24.07% cc1plus 11 0 16 -76 - 0K 512K WAIT 0
> 26:55 11.33% intr 54732 0 1 85 10 87976K 77872K RUN
> 0 0:01 11.28% cc1plus 3289 1001 10 20 0 515M 387M
> uwait 0 163:26 3.47% firefox-bin 54721 1001 1 20 0
> 13656K 11744K CPU0 0 0:00 0.10% top 54731 0 1 49
> 10 14440K 12064K wait 0 0:00 0.10% g++ 54736 0 1
> 52 0 11240K 9856K biowr 0 0:00 0.00% as 54734 0 1
> 42 0 12176K 10992K wait 0 0:00 0.00% c++ 54735 0
> 1 72 0 17696K 11336K CPU1 1 0:00 0.00% cc1plus
>
> At such loads the system is noticeably slower.
> I'm not sure if nice has the same effect on
> all child processes, or only on the parent
> process?
>
> I'd like to set the make process
> and all its child processes to run only
> when there is some idle CPU. Is it feasible?
>
why should the command 'nice ...' not work. It worked for me when I
have had a single CPU machine without problems.
The only difference was that I packed it into a script.
Erich
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