computer becomes slow when compiling something

[Robert Watson]

On Mon, 27 Aug 2007, Ganbold wrote:

> I'm running FreeBSD 7.0-CURRENT with SCHED_ULE, INVARIANTS, WITNESS enabled 
> kernel.

Try the same thing again without INVARIANTS and WITNESS, both of which can 
consume a lot of CPU in kernel on a very active system, especially if lots of 
vnodes are being allocated and freed.  Especially WITNESS.

Robert N M Watson
Computer Laboratory
University of Cambridge

>
> daemon# uname -an
> FreeBSD daemon.micom.mng.net 7.0-CURRENT FreeBSD 7.0-CURRENT #2: Thu Aug 23 
> 17:59:17 ULAT 2007 
> tsgan at daemon.micom.mng.net:/usr/obj/usr/src/sys/GDAEMON  i386
> daemon#
>
> When compiling something (buildworld or making wine for example) inside from 
> X/gnome
> my computer becomes very slow.
>
> top shows while compiling wine:
>
> last pid: 38660;  load averages:  3.10,  2.24,  1.33 
> up 3+02:07:05  12:11:38
> 106 processes: 3 running, 102 sleeping, 1 zombie
> CPU states: 90.2% user,  0.0% nice,  9.8% system,  0.0% interrupt,  0.0% idle
> Mem: 704M Active, 63M Inact, 168M Wired, 39M Cache, 111M Buf, 21M Free
> Swap: 2048M Total, 195M Used, 1853M Free, 9% Inuse
>
> PID USERNAME    THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
> 902 tsgan         1  96    0   147M   134M RUN    929:41  3.96% Xorg
> 38659 root          1  96    0 15556K 12256K RUN      0:00  3.47% cc1
> 1206 tsgan         1  44   19   156M 36940K select 178:06  0.00% 
> operapluginwrapper
> 978 tsgan         1  44    0   212M   173M select 103:26  0.00% opera
> 954 tsgan         1  44    0 35236K 18372K select  11:59  0.00% wnck-applet
> 975 tsgan         7  44    0   198M   159M ucond    8:53  0.00% 
> thunderbird-bin
> 922 tsgan         1  44    0  4808K  1460K select   4:43  0.00% gam_server
> 956 tsgan         1  44    0 35324K 16328K select   4:36  0.00% 
> mixer_applet2
> 962 tsgan         1  44    0 13736K  5936K select   1:57  0.00% 
> gnome-screensaver
> 1224 tsgan         1  44    0 70232K 28900K select   1:33  0.00% pidgin
> 1591 tsgan         1  44   19  5520K   772K select   1:17  0.00% 
> operapluginwrapper
> 772 root          1  44    0  4496K   928K select   1:03  0.00% 
> hald-addon-storage
> 930 tsgan         1  44    0 16204K  8744K select   0:48  0.00% metacity
> 441 root          1  44    0  3276K   592K select   0:45  0.00% moused
> 765 haldaemon     1  44    0  6164K  2252K select   0:41  0.00% hald
> ...
>
> Is it due to SCHED_ULE makes a process CPU greedy and that is why my computer 
> becomes slow?
> Or it is something else? What SCHED_ULE sysctl knobs should I test here?
> As I recall correctly I have never experienced such problems until recently.
> Maybe I'm wrong here.
>
> thanks,
>
> Ganbold
>
>
> -- 
> X windows: Accept any substitute. If it's broke, don't fix it. If it ain't 
> broke, fix it. Form follows malfunction. The Cutting Edge of Obsolescence. 
> The trailing edge of software technology. Armageddon never looked so good. 
> Japan's secret weapon. You'll envy the dead. Making the world safe for 
> competing window systems. Let it get in YOUR way. The problem for your 
> problem. If it starts working, we'll fix it. Pronto. It could be worse, but 
> it'll take time. Simplicity made complex. The greatest productivity aid since 
> typhoid. Flakey and built to stay that way. One thousand monkeys. One 
> thousand MicroVAXes. One thousand years. X windows.
>
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