[Building Sakai] [Using Sakai] Sakai Slow Down

[Nate Angell]

Cross-posting further information from Bradley about their environment  
in hopes of advice on a performance slow down issue.

Barb: Perhaps you could also better describe the exact symptoms of the  
issue?

On Sep 10, 2009, at 2:42 PM, Barb Kerns wrote:

>
>
> 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
>>
>>
>
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