[Deploying Sakai] [Building Sakai] Performance issues at 2.6.x
mizematr at notes.udayton.edu
mizematr at notes.udayton.edu
Thu Feb 17 07:02:07 PST 2011
I would recommend visualgc (
http://java.sun.com/performance/jvmstat/visualgc.html) to watch garbage
collection in tomcat over trying to read a log file. It's easy to run and
can tell you at a glance if there's a problem (PermGen is close to full,
garbage collections are constantly running, etc) and much more human
friendly then a log file (we can't all be Watson can we?). We used it
when we first brought Sakai up at UDayton and it greatly helped us tune
Matt Mize, Systems Administrator
- Pay no attention to the man in the back office....
Matt.Mize at notes.udayton.edu
UDit Department, University of Dayton
300 College Park, Dayton, OH, 45469-1302
From: DAVID ROLDAN MARTINEZ <darolmar at upvnet.upv.es>
To: Aaron Zeckoski <azeckoski at unicon.net>
Cc: "production at collab.sakaiproject.org"
<production at collab.sakaiproject.org>, "sakai-dev at collab.sakaiproject.org"
<sakai-dev at collab.sakaiproject.org>, "mt at collab.sakaiproject.org"
<mt at collab.sakaiproject.org>
Date: 02/17/2011 08:13 AM
Subject: Re: [Building Sakai] [Deploying Sakai] Performance issues
Sent by: sakai-dev-bounces at collab.sakaiproject.org
Thanks for the remark. I'll be careful (even more than usually).
De: azeckoski at gmail.com [azeckoski at gmail.com] En nombre de Aaron Zeckoski
[azeckoski at unicon.net]
Enviado el: jueves, 17 de febrero de 2011 14:05
Para: DAVID ROLDAN MARTINEZ
CC: production at collab.sakaiproject.org; sakai-dev at collab.sakaiproject.org;
mt at collab.sakaiproject.org
Asunto: Re: [Building Sakai] [Deploying Sakai] Performance issues at 2.6.x
I would be careful about turning on GC logging actually. That will
increase the load and actually slow down your server (just a little)
making a bad situation just a little bit worse. Probably better to
just monitor the JVM remotely as this will give you just as much info
and can be easily switched on and off.
On Thu, Feb 17, 2011 at 7:47 AM, Mike De Simone
<michael.desimone at rsmart.com> wrote:
> 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:
> -3 <tomcat-pid>
> - if tomcat memory usage indicated by 'ps' (RSS column) is close to or
> 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.
> know there have been some for message center (but v2.7), but at any
> here are indexes that others have applied that have helped:
> SAKAI.MFR_MESSAGE_T (SURROGATEKEY , DELETED , DRAFT );
> SAKAI.MFR_TOPIC_T("TOPIC_DTYPE","TITLE","PF_SURROGATEKEY","UUID") ;
> 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
> rSmart | 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.
>> haven't make any configuration change or Sakai code update and,
>> our servers are under very high load conditions.
>> We are running a 2.6.x. Does anybody know if there is a list of
>> to be apply in order to improve performance in a 2.6.x installation?
>> Thank you very much in advance.
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