High Java CPU usage question

[powrrrplay]

I am having this problem as well.
100% dual cpu consumption. The whole system is hung.
It consistently happens every 24 to 48 Hrs.

Ubuntu 10.04 x64
Zimbra 7.1.3 w/patch 7.1.3

I have to hard reset/crash the system to get zimbra running again

[vavai]

Hi,

Originally Posted by powrrrplay

I am having this problem as well.
100% dual cpu consumption. The whole system is hung.
It consistently happens every 24 to 48 Hrs.

Ubuntu 10.04 x64
Zimbra 7.1.3 w/patch 7.1.3

I have to hard reset/crash the system to get zimbra running again

What if trying to tweak some configuration (take a full backup before trying to applying some suggestion) :

[SOLVED] Very high CPU usage with 7.1.1

[vavai]

Hi Naik,

Originally Posted by Naik

So it is probably tomcat using Java. But still dont know why Java is going crazy. I think it is probably one of the bad coded zimlet but dont even know which one to start on and not even 100% if it is a zimlet... I am suspecting Social Zimlet...

I'm also using social media zimlet without problem. If you think social media is your root problem, just trying to disable/undeploy the zimlet and then restart the services.

[vavai]

Hi,

Originally Posted by ccelis5215

Uhmmm. that's happened in my server where i've allocated 2 gigs.

How many users and how much physical memory?

[powrrrplay]

my last zimbra directory backup was 8.6 GB (disk to disk copy)
- dual 2.2 Ghz processors
- 100 GB HDD
- 8 GB RAM

the system runs very low cpu, consistently.

there is a bug somewhere causing 100% cpu loop, an unresponsive system

[Labsy]

Mine ZCS 7.1.2 also! Started this week - it was all fine until this week. No changes made to ZCS server for a month or two for sure.

QuadXEON, 3,2 GHz
8 GB RAM
Ubuntu 8.04 LTS, 64-bit
ZCS 7.1.2
Domains: 300+
Users: 2000+

Before: CPU average 12%
This week: CPU average: 64%
CPU hog process: JAVA

** EDIT **
I upgraded to 7.1.4 ZCS and CPU went back to normal. Actually, it went way down below previous average.
Now my ZCS is using on average 3% CPU, which is more than satisfactory!

[mrcoffee11]

I still have the problem with 7.1.4. Did you used some extra commands to boost performance and delay certain automated checks?

Grtz,
Roderick

[Labsy]

No, nothing special was configured, just upgraded to 7.1.4.

But in my case I had one separate problem on ESX host, which begun using ESX swap due to overcommited memory settings. Memory swapping on ESX is a huge performance impact, which might also be guilty in part for my performance problems with ZCS.

As I see you are on ESX 4.1, so check in vSphere client --> ESX host --> Performance --> Default or Disk --> enable "Swap-in" and "Swap-out" graphs. If either of those is not zero, then you ESX host is swapping memory to disk, which is very, very bad. If this is your case, see the largest swap consumption (mine was 500 MB) and lower RAM MAX for all VMs so, that total sum of max RAM usage would be lower for at least swap max consumption (in my case, I reduced RAM MAX values for 550 MB).
After few days I checked "Swap-in" And "Swap-out" graphs and they were both at ZERO, my server's performance is fine since then

[mrcoffee11]

Thnx for the reply!
There is no ESX swapping, enough free memory available. And the thing is the high spikes also occur after installing a new guest OS and Zimbra, without any mailboxes and users.

It works though but the cause of the spikes is a java process that is executed every 2 to 2:20 minutes. I wonder what this process is and how it can be rescheduled to a longer time interval.

You can see graphs and more info here:
CPU High Spikes around every 2 minutes ZSC 7.1.4

Grtz,
Roderick

[gregor]

Originally Posted by mrcoffee11

Thnx for the reply!
There is no ESX swapping, enough free memory available. And the thing is the high spikes also occur after installing a new guest OS and Zimbra, without any mailboxes and users.

It works though but the cause of the spikes is a java process that is executed every 2 to 2:20 minutes. I wonder what this process is and how it can be rescheduled to a longer time interval.

You can see graphs and more info here:
CPU High Spikes around every 2 minutes ZSC 7.1.4

Grtz,
Roderick

hi,

did you found a solution? or anybody else
i have the same problem after upgrade my system to 7.1.4
my system getting very slow after some hours uptime.
currently 32 java processes are running: ps aux | grep -i java | wc -l

used version:
esxi environment: esxi 5.0.0
os: centos 6 2.6.32-71.el6.x86_64
zimbra: 7.1.4_GA_2555.RHEL6_64_20120105094542 CentOS6_64 FOSS edition

greetings
gregor