HIGH CPU Fog Services after update r5029 v6759

Tom Elliott

@Wayne-Workman And all, I made a rather significant change (though outside it shouldn’t matter), to hopefully make an attempt at figuring this out.

Basically please try out the latest. First thing I noticed was a very similar result on my storage nodes, (one that is Ubuntu 15, and the other that is Fedora 23) and I found that my particular issue was due to the service sleep time being parsed as a string rather than an integer. This would cause the FOG Services to keep cycling (after initial reboot) probably due to improper connection finding. I’m hoping this is fixed but also a much more performance enhanced FOG server capability.

baggar11

@Tom-Elliott Thanks Tom. Have these changes been pushed to Git too? That’s what I’m using…

Tom Elliott

@baggar11 Whenever I push, I automatically push to both svn and git. I’m not expecting any miracles though, but would be nice to know if I’m at least kind of on the right track.

baggar11

I’m still seeing the issue on the newly pushed 6775. ImageReplicator, MulticastManager and SnapinReplicator seem to be taking all of the cpu load at around 31.6%

ps aux | grep FOG
root       814 31.6  2.3 196196 23976 ?        R    15:39   0:44 /usr/bin/php -q /opt/fog/service/FOGImageReplicator/FO ImageReplicator
root       846 31.6  2.3 196244 24116 ?        R    15:39   0:44 /usr/bin/php -q /opt/fog/service/FOGMulticastManager/FOGMulticastManager
root       869 31.5  2.3 196196 24068 ?        R    15:39   0:44 /usr/bin/php -q /opt/fog/service/FOGSnapinReplicator/FOGSnapinReplicator
root       916  0.0  1.8 274228 19244 ?        S    15:39   0:00 /usr/bin/php -q /opt/fog/service/FOGImageReplicator/FO ImageReplicator
root       918  0.0  1.9 274404 19344 ?        S    15:39   0:00 /usr/bin/php -q /opt/fog/service/FOGMulticastManager/FOGMulticastManager
root       939  0.0  1.8 274096 19172 ?        S    15:39   0:00 /usr/bin/php -q /opt/fog/service/FOGSnapinReplicator/FOGSnapinReplicator
root      1001  0.1  2.3 196200 24092 ?        S    15:39   0:00 /usr/bin/php -q /opt/fog/service/FOGTaskScheduler/FOGTaskScheduler
root      1031  0.1  2.3 196200 24136 ?        S    15:39   0:00 /usr/bin/php -q /opt/fog/service/FOGPingHosts/FOGPingHosts
root      1127  0.0  1.9 274696 19620 ?        S    15:39   0:00 /usr/bin/php -q /opt/fog/service/FOGTaskScheduler/FOGTaskScheduler
root      1150  0.0  1.9 274436 19652 ?        S    15:39   0:00 /usr/bin/php -q /opt/fog/service/FOGPingHosts/FOGPingHosts

Wayne Workman

@baggar11 see how the G is missing?

/opt/fog/service/FOGImageReplicator/FO ImageReplicator

Wonder if that is significant…

baggar11

@Wayne-Workman My screen wrapped in my terminal. The “G” is in fact there when I full screen and grep the ps output again.

Wayne Workman

@baggar11 Can you give us the last 500 or so Image Replicator logs? FOG Configuration -> LOG Viewer -> Image Replicator.

Also, you might just look through all the logs in there for anything out of place.

Tom Elliott

@baggar11 does ubuntu 14.04 use systemctl?

Is there anything spewing into your /etc/apache2/error.log

Wayne Workman

@Tom-Elliott said:

@baggar11 does ubuntu 14.04 use systemctl?

No, it does not.

baggar11

@Wayne-Workman Here you go. 500 lines of logs.

EDIT: Forgot to select Image Replicator. Here it is.

https://www.refheap.com/116045

baggar11

@Tom-Elliott Here’s what I’m seeing after stopping all services, clearing the logs and then rebooting.

cat error.log 
[Wed Mar 16 16:10:53.258602 2016] [mpm_prefork:notice] [pid 946] AH00163: Apache/2.4.18 (Ubuntu) OpenSSL/1.0.2g configured -- resuming normal operations
[Wed Mar 16 16:10:53.258795 2016] [core:notice] [pid 946] AH00094: Command line: '/usr/sbin/apache2'
[Wed Mar 16 16:11:35.735081 2016] [:error] [pid 950] [client 192.168.10.15:53300] PHP Strict Standards:  Only variables should be passed by reference in /var/www/fog/lib/pages/dashboardpage.class.php on line 71, referer: http://192.168.10.14/fog/management/index.php

Tom Elliott

@baggar11 What services are using the bulk of the CPU?

baggar11

@Tom-Elliott For a full view of processes, I gave an output of ps aux | grep FOG down below. These are the top 3 though.

FOGImageReplicator
FOGMulticastManager
FOGSnapinReplicator

Tom Elliott

@baggar11 And they’re constantly cycling CPU?

baggar11

@Tom-Elliott Uptime is now at 17 minutes and nothing has changed in CPU cycle regard.

baggar11

One thing that I noted was interesting was after an upgrade, cpu cycles are normal. System is idling. FOG WebUI works fine, no issues.

Once I restart the virtual machine and the FOG services start up on boot, that’s when those 3 services start consuming all of the cpu.

Tom Elliott

@baggar11 Well, there’s 5 total services.

That said, it seems this is somewhat well known about, and our method to “check” and correct isn’t working properly. It only seems, to me, to impact Ubuntu (Maybe older versions of Debian?)

I know the problem, in the past, was related to the network (maybe other required services) aren’t running when the FOG Services start up.

Maybe try adding a sleep 30, then manually start the services by the use of the rc.local file.

Basically the rc.local is processed LAST and by that time, network may still not be up, so the sleep time just ensure’s it has ample time to come up.

Try disabling the FOG Services from starting at boot.

Then, edit the /etc/rc.local file.

Add:

sleep 30
/etc/init.d/FOGPingHosts stop
/etc/init.d/FOGScheduler stop
/etc/init.d/FOGImageReplicator stop
/etc/init.d/FOGSnapinReplicator stop
/etc/init.d/FOGMulticastManager stop
/etc/init.d/FOGPingHosts start
/etc/init.d/FOGScheduler start
/etc/init.d/FOGImageReplicator start
/etc/init.d/FOGSnapinReplicator start
/etc/init.d/FOGMulticastManager start

This should put the service files to a point where they’re not constantly looping (which is what’s most likely causing the CPU load in the first place.

baggar11

Sorry guys! I have been rolling the dev version for so long without issue, I totally forgot about the startup services possibly being an issue. I’m all set now. Here’s what I did.

Ran this on each service

sudo update-rc.d FOG*service* disable

Then, as suggested, added these line to my rc.local

sleep 5
service FOG*service* start

Wayne Workman

@baggar11 Very nice.

Raymond Bell

@Tom-Elliott Upgrade to latest pull r5037
server is fine if i start the services one at a time

but both storage nodes have high CPU
and i have started them one at a time to check
as soon as i start one it jumps to like 98% and levels out at about 50%

top - 07:35:37 up 16:54,  2 users,  load average: 4.40, 2.95, 3.82
Tasks: 219 total,   5 running, 214 sleeping,   0 stopped,   0 zombie
%Cpu(s): 69.7 us, 30.1 sy,  0.0 ni,  0.1 id,  0.0 wa,  0.0 hi,  0.1 si,  0.0 st
KiB Mem:   7735460 total,  1368652 used,  6366808 free,   107516 buffers
KiB Swap:  7828476 total,        0 used,  7828476 free.   824568 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 8183 root      20   0   41920  20308  15328 R  91.6  0.3   1:38.30 FOGMulticastMan
 8212 root      20   0   41920  20692  15712 R  91.6  0.3   1:38.56 FOGSnapinReplic
 8239 root      20   0   41920  20584  15604 R  82.7  0.3   1:28.03 FOGPingHosts
 8226 root      20   0   41920  20132  15156 R  70.1  0.3   1:34.14 FOGTaskSchedule
 8197 root      20   0   41920  20140  15160 S  63.7  0.3   1:36.08 FOGImageReplica
    1 root      20   0    4612   3872   2616 S   0.0  0.1   0:01.52 init
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kthreadd
    3 root      20   0       0      0      0 S   0.0  0.0   0:03.83 ksoftirqd/0
    5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H
    7 root      20   0       0      0      0 S   0.0  0.0   0:27.75 rcu_sched
    8 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcu_bh
    9 root      rt   0       0      0      0 S   0.0  0.0   0:00.00 migration/0
   10 root      rt   0       0      0      0 S   0.0  0.0   0:00.09 watchdog/0
   11 root      rt   0       0      0      0 S   0.0  0.0   0:00.10 watchdog/1
   12 root      rt   0       0      0      0 S   0.0  0.0   0:00.00 migration/1
   13 root      20   0       0      0      0 S   0.0  0.0   0:00.15 ksoftirqd/1
   14 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kworker/1:0
   15 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/1:0H
   16 root      rt   0       0      0      0 S   0.0  0.0   0:00.10 watchdog/2
   17 root      rt   0       0      0      0 S   0.0  0.0   0:00.00 migration/2

HIGH CPU Fog Services after update r5029 v6759

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