[OpenIndiana-discuss] Problem with high cpu load (oi_151a)
Rennie Allen
rennieallen at gmail.com
Thu Oct 20 18:02:24 UTC 2011
Sched is the scheduler itself. How long did you let this run? If only
for a couple of seconds, then that number is high, but not ridiculous for
a loaded system, so I think that this output rules out a high context
switch rate.
Try this command to see if some process is making an excessive number of
syscalls:
dtrace -n 'syscall:::entry { @[execname]=count()}'
If not, then I'd try looking at interrupts...
On 10/20/11 10:52 AM, "Gernot Wolf" <gw.inet at chello.at> wrote:
>Yeah, I've been able to run this diagnostics on another OI box (at my
>office, so much for OI not being used in production ;)), and noticed
>that there were several values that were quite different. I just don't
>have any idea on the meaning of this figures...
>
>Anyway, here are the results of the dtrace command (I executed the
>command twice, hence two result sets):
>
>gernot at tintenfass:~# dtrace -n 'sched:::off-cpu { @[execname]=count()}'
>dtrace: description 'sched:::off-cpu ' matched 3 probes
>^C
>
> ipmgmtd 1
> gconfd-2 2
> gnome-settings-d 2
> idmapd 2
> inetd 2
> miniserv.pl 2
> netcfgd 2
> nscd 2
> ospm-applet 2
> ssh-agent 2
> sshd 2
> svc.startd 2
> intrd 3
> afpd 4
> mdnsd 4
> gnome-power-mana 5
> clock-applet 7
> sendmail 7
> xscreensaver 7
> fmd 9
> fsflush 11
> ntpd 11
> updatemanagernot 13
> isapython2.6 14
> devfsadm 20
> gnome-terminal 20
> dtrace 23
> mixer_applet2 25
> smbd 39
> nwam-manager 60
> svc.configd 79
> Xorg 100
> sched 394078
>
>gernot at tintenfass:~# dtrace -n 'sched:::off-cpu { @[execname]=count()}'
>dtrace: description 'sched:::off-cpu ' matched 3 probes
>^C
>
> automountd 1
> ipmgmtd 1
> idmapd 2
> in.routed 2
> init 2
> miniserv.pl 2
> netcfgd 2
> ssh-agent 2
> sshd 2
> svc.startd 2
> fmd 3
> hald 3
> inetd 3
> intrd 3
> hald-addon-acpi 4
> nscd 4
> gnome-power-mana 5
> sendmail 5
> mdnsd 6
> devfsadm 8
> xscreensaver 9
> fsflush 10
> ntpd 14
> updatemanagernot 16
> mixer_applet2 21
> isapython2.6 22
> dtrace 24
> gnome-terminal 24
> smbd 39
> nwam-manager 58
> zpool-rpool 65
> svc.configd 79
> Xorg 82
> sched 369939
>
>So, quite obviously there is one executable standing out here, "sched",
>now what's the meaning of this figures?
>
>Regards,
>Gernot Wolf
>
>
>Am 20.10.11 19:22, schrieb Michael Stapleton:
>> Hi Gernot,
>>
>> You have a high context switch rate.
>>
>> try
>> #dtrace -n 'sched:::off-cpu { @[execname]=count()}'
>>
>> For a few seconds to see if you can get the name of and executable.
>>
>> Mike
>> On Thu, 2011-10-20 at 18:44 +0200, Gernot Wolf wrote:
>>
>>> Hello all,
>>>
>>> I have a machine here at my home running OpenIndiana oi_151a, which
>>> serves as a NAS on my home network. The original install was
>>>OpenSolaris
>>> 2009.6 which was later upgraded to snv_134b, and recently to oi_151a.
>>>
>>> So far this OSOL (now OI) box has performed excellently, with one major
>>> exception: Sometimes, after a reboot, the cpu load was about 50-60%,
>>> although the system was doing nothing. Until recently, another reboot
>>> solved the issue.
>>>
>>> This does not work any longer. The system has always a cpu load of
>>> 50-60% when idle (and higher of course when there is actually some work
>>> to do).
>>>
>>> I've already googled the symptoms. This didn't turn up very much useful
>>> info, and the few things I found didn't apply to my problem. Most
>>> noticably was this problem which could be solved by disabling cpupm in
>>> /etc/power.conf, but trying that didn't show any effect on my system.
>>>
>>> So I'm finally out of my depth. I have to admit that my knowledge of
>>> Unix is superficial at best, so I decided to try looking for help here.
>>>
>>> I've run several diagnostic commands like top, powertop, lockstat etc.
>>> and attached the results to this email (I've zipped the results of
>>>kstat
>>> because they were>1MB).
>>>
>>> One important thing is that when I boot into the oi_151a live dvd
>>> instead of booting into the installed system, I also get the high cpu
>>> load. I mention this because I have installed several things on my OI
>>> box like vsftpd, svn, netstat etc. I first thought that this problem
>>> might be caused by some of this extra stuff, but getting the same
>>>system
>>> when booting the live dvd ruled that out (I think).
>>>
>>> The machine is a custom build medium tower:
>>> S-775 Intel DG965WHMKR ATX mainbord
>>> Intel Core 2 Duo E4300 CPU 1.8GHz
>>> 1x IDE DVD recorder
>>> 1x IDE HD 200GB (serves as system drive)
>>> 6x SATA II 1.5TB HD (configured as zfs raidz2 array)
>>>
>>> I have to solve this problem. Although the system runs fine and
>>> absolutely serves it's purpose, having the cpu at 50-60% load
>>>constantly
>>> is a waste of energy and surely a rather unhealthy stress on the
>>>hardware.
>>>
>>> Anyone any ideas...?
>>>
>>> Regards,
>>> Gernot Wolf
>>> _______________________________________________
>>> OpenIndiana-discuss mailing list
>>> OpenIndiana-discuss at openindiana.org
>>> http://openindiana.org/mailman/listinfo/openindiana-discuss
>>
>>
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