Re: computer becomes slow when compiling something

> Date: Mon, 27 Aug 2007 12:25:38 +0800
> From: Ganbold <ganbold_at_micom.mng.net>
> Sender: owner-freebsd-current_at_freebsd.org
> 
> Hi,
> 
> I'm running FreeBSD 7.0-CURRENT with SCHED_ULE, INVARIANTS, WITNESS 
> enabled kernel.
> 
> 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.

I've seen it for a while. You are running out of RAM and I have found
that once the swap use starts growing, things get VERY slow. I still
think something is wrong, but memory is cheap and an extra 1/2 Gig can
make a huge difference. I have not seen any difference between
schedulers...about the same with 4BSD and ULE.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman_at_es.net			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751