topic Re: High CPU utilization in Alfresco Archive

High CPU utilization

raju_myadam — Wed, 31 Dec 2008 12:58:53 GMT

Hello,We have released an application into production recently. The application is built on top of community version of Alfresco 2.1. We are seeing high CPU utilization around 75% even when the system is idle with no user activity. We are using following features of Alfresco - Alfresco Document mana

Re: High CPU utilization

mrogers — Wed, 31 Dec 2008 13:57:28 GMT

It may be worth tuning your environment, have you given the JVM enough RAM for example?

What are you using VMWare for?

Does your server box have anything else on it? Is your server running well without Alfresco?

It could also be async processes such as the full text indexers. How long has your production system been stable?

Re: High CPU utilization

raju_myadam — Wed, 31 Dec 2008 14:03:10 GMT

Thanks for your response.

JVM min and max settings are 512 MB. The total RAM is 1 GB dual CPU.

It's a blade server, multiple partitions are running and managed by VM Ware.
It's been 3 weeks since we deployed the application in production. We are seeing high CPU utilization since then. On the same blade server we have jboss running which is perfectly fine in terms of CPU.

Regards,
Raju

Re: High CPU utilization

nadaoneal — Mon, 26 Jan 2009 20:24:52 GMT

We were having a very similar problem, but worse, so that we were getting "java.lang.OutOfMemoryError: PermGen space" in the error log and CPU utilization was going past 90%. The solution in our case was to add a MaxPermSize as well to our JAVA_OPTS…
"-Xms256m -Xmx512m -Xss96k -XX:MaxPermSize=128m -server"
… hope that helps.

Re: High CPU utilization

raju_myadam — Mon, 26 Jan 2009 20:34:12 GMT

Thanks for your suggestion.

We have identified the cause for the high CPU utilization. The problem was due to CIFS access. Whenever we access the space through CIFS protocol we have seen the CPU utilization spike. We had a batch process runs frequently and access the space through CIFS protocol. We have to re-engineer the solution to reduce the usage of accessing the spaces through CIFS protocol.

Regards,
Raju

Re: High CPU utilization

beren — Tue, 27 Jan 2009 03:41:14 GMT

If it is a blade server - what type of drive system are you using?

Many blade systems come with low-end SCSI and even IDE/SATA drive systems rather than decent NAS/SAN storage. Local low-end storage on blades can really drive up the CPU since there is no advanced controller card or caching services.

beren

Re: High CPU utilization

zomurn — Tue, 26 May 2009 15:00:33 GMT

I have the same problem on a dedicated production server for alfresco.
CPU Load is at 400% and vary between 100% and 400% on a quad core Xeon with 4Go RAM.
Alfresco startup command line is :

/home/oracle/jdk1.5.0_16/bin/java -Xms512m -Xmx1024m -server

I think this is a normal behavior, and lucene indexes are computed in background.
If it is the case, my question is how can I schedule this process the night ? Which file to modify ?

Thanks

Re: High CPU utilization

lasse_mammen — Tue, 23 Jun 2009 14:50:20 GMT

I don't think this is due to indexing. When using WEBDAV, the cpu load is much lower and it feel way more responsive as well.

Would be nice to have some kind of solution and/or answer to this.

Re: High CPU utilization

amathewk — Tue, 30 Jun 2009 02:05:36 GMT

Hi,

I also have the same problem. I am running on a shared VPS on CentOS.

There are only 3 word documents and one pdf loaded into a alfresco site. I am the only user accessing the system. The cpu usage starts off fine and then spikes to 100% after a while.

My site and vps account is responsive but the admins keep warning me about my excessive usage. Please let me if you have any ideas.

thanks

Anil

Re: High CPU utilization

zomurn — Thu, 17 Sep 2009 13:55:43 GMT

My problem comes and comes again…I'am almost sure (very) it is a problem of configuration : that's lucene backup task ? I imagine a lucene indexing task that use 100% CPU.
I really need help to this it regularly happens in production or whatever.

Thanks

Re: High CPU utilization

amitabhandari1 — Thu, 28 Jul 2011 09:41:10 GMT

I am also facing same issue , with indexing the CPU utilization is going to 90% and server don't respond after this.
Any help is appreciable .

Thanks,
Amita

Re: High CPU utilization

wayward — Thu, 20 Mar 2014 06:35:00 GMT

At night, there cpu action is normal. But in daytime i see spike's. We had a problem that the os harddisk was full of log file's. We resolved this, dont know if this could be linked to this problem.

Wich steps do we need to take next? Or even better what is this?

Also sometimes the system says Service temporary unavaible.

When rebooting i get an error that connection to java is refused.

After the reboot, al cpu spikes are gone, will keep an eye on this. But i still want to know what this is.

Re: High CPU utilization

wayward — Sat, 22 Mar 2014 10:02:37 GMT

For search avaibility:
/opt/alfresco-4.2.c/java/bin -Djava.util.logging.config.file=/opt/alfresco-4.2.c/tomcat/conf/logging.properties -X

Re: High CPU utilization

wayward — Sat, 22 Mar 2014 10:03:17 GMT

When i reboot the cpu is normal, after a night i get the cpu spikes back. Seems that a routine is causing this.

Re: High CPU utilization

wayward — Mon, 24 Mar 2014 06:31:05 GMT

Found another thing, the spikes begin round 6:05, what is running on al fresco around this time?

At the reboot i get:
cat: opt/alfresco-4.2.c/tomcat/temp/catalina pid no such file

Re: High CPU utilization

wayward — Tue, 25 Mar 2014 06:14:29 GMT

Found the problem, we changed a script and used to restart the java after the logs are cleaned, that caused the cpu peaks, i will post the original script with the conflicting rule this evening (For my own entertainment)

Re: High CPU utilization

wayward — Tue, 25 Mar 2014 06:14:58 GMT

Here the cpu usage in a jpeg file