[Deploying Sakai] Performance issues at 2.6.x

Mike De Simone michael.desimone at rsmart.com
Thu Feb 17 04:47:32 PST 2011

there are a few things I would check:
- RAM usage on the app servers.  make sure there is no swapping.
- check thread usage, make sure you are not out of tomcat threads
(MaxThreads settings in serverl.xml).  Check this with a thread dump:  kill
-3 <tomcat-pid>
- if tomcat memory usage indicated by 'ps' (RSS column) is close to or over
that which is specified in -Xmx you may be having excessive garbage
collection.  Turn on gc logging with something like this added to
setenv.sh: JAVA_OPTS="$JAVA_OPTS -verbose:gc -XX:+PrintGCTimeStamps
- check database logs for slow queries and apply indexes if applicable.  I
know there have been some for message center (but v2.7), but at any rate,
here are indexes that others have applied that have helped:

 there was a thread titled "[Deploying Sakai] database load" on 1-dec-10
with this info.   you could search gmane for it.

Hope this helps a little!


Mike DeSimone
Lead Systems Engineer
*r**Smart* | 602-490-0473

On Thu, Feb 17, 2011 at 02:06, DAVID ROLDAN MARTINEZ <darolmar at upvnet.upv.es
> wrote:

>      Hi all,
>      We are suffering serious performance issues and we don't know why. We
> haven't make any configuration change or Sakai code update and, suddenly,
> our servers are under very high load conditions.
>       We are running a 2.6.x. Does anybody know if there is a list of JIRA
> to be apply in order to improve performance in a 2.6.x installation?
>        Thank you very much in advance.
>        Cheers,
>          DRM
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