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Date:      Wed, 29 Aug 2012 14:56:07 +0100 (BST)
From:      Anton Shterenlikht <mexas@bristol.ac.uk>
To:        freebsd-questions@freebsd.org
Subject:   reduce priority of large port builds, e.g. firefox, gcc4x
Message-ID:  <201208291356.q7TDu7wO055575@mech-cluster241.men.bris.ac.uk>

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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?

Thanks

Anton



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