[Using Sakai] Sakai Slow Down

[Barb Kerns]

We have two SUN T5220s. One runs the Apache front-end and the MySQL
database, each in a seperate zone. The other physical system runs Tomcat in
a zone.
The two servers are identical hardware:
* Sun Fire T5220 servers
* 1.2 GHz, 8 core 
* 32 Gb memory 
* Two 146 Gb disk drives (mirrored), plus disk space on the SAN

On the production Sakai Tomcat server JAVA_OPTS are set to:
JAVA_OPTS="-server -XX:+UseParallelGC -Xms2500m -Xmx2500m -XX:NewSize=512m
-XX:MaxNewSize=512m -XX:PermSize=512m -XX:MaxPermSize=512m
-Djava.awt.headless=true -Dsakai.demo=false"

A quick look at top while the slowdown happens doesn't seem to indicate the
problem is a hardware bottleneck.

(Would one of you grant a favor and pass this on to the Production and
Sakai-dev lists? I have registered to both the production and sakai-dev
lists, but am still being denied the permissions to post to those lists.)

Barb 


On 9/10/09 12:43 PM, "Stephen Marquard" <stephen.marquard at uct.ac.za> wrote:

> Hi Barb
> 
> It's a bit hard to say without more details. Some generic suggestions are:
> 
> - Give the app servers more memory
> - Add more app servers
> - Upgrade to the latest release and/or maintenance branch (2.5.4, 2.6.0, 2-5-x
> or 2-6-x).
> 
> You could also look at the PROD category in JIRA to see production
> configurations from other sites of similar scale.
> 
> I'd suggest you post some more detailed info (e.g. about your app servers and
> database and any information you have about where the bottlenecks are) to the
> production or sakai-dev lists, which are better places to get feedback than
> sakai-user.
> 
> Regards
> Stephen 
>  
>>>> Barb Kerns <brk at bumail.bradley.edu> 9/10/2009 7:35 PM >>>
> We are in the midst of moving from Blackboard to Sakai and have had high
> adoption this Fall by faculty.  However, this week Sakai web services
> stopped twice and at other times is slow to load pages.  We are self hosted
> Sakai 2.5.0 on two Sun servers and have about 650 course sites, 1000
> simultaneous sessions through most of the day/evening and about 1 million
> hits per day.  Where should we start in improving speed/performance?
> We would appreciate any guidance.
> 
> Barb Kerns
> Bradley University
> Peoria, IL USA
> (309) 677-2332
> 
>