Date: Wed, 29 Aug 2012 21:07:21 +0700 From: Erich Dollansky <erichfreebsdlist@ovitrap.com> To: mexas@bristol.ac.uk Cc: freebsd-questions@freebsd.org Subject: Re: reduce priority of large port builds, e.g. firefox, gcc4x Message-ID: <20120829210721.141dcf18@AMD620.ovitrap.com> In-Reply-To: <201208291356.q7TDu7wO055575@mech-cluster241.men.bris.ac.uk> References: <201208291356.q7TDu7wO055575@mech-cluster241.men.bris.ac.uk>
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Hi, On Wed, 29 Aug 2012 14:56:07 +0100 (BST) Anton Shterenlikht <mexas@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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