[Building Sakai] [samigo-team] Monitoring Samigo in a big test

[Sam Ottenhoff]

I strongly recommend checking out the tiny Samigo patch in this JIRA that
moved JSF view state from server to client:

  https://jira.sakaiproject.org/browse/SAK-25677


On Fri, May 23, 2014 at 7:34 AM, Daniel Merino <daniel.merino at unavarra.es>wrote:

> Hi everybody.
>
> Time ago, we had a system crash while one Samigo test was being made by
> 250+ users. System memory was filled up and our production environment
> gradually slowed down until it crashed.
>
> This happened after using the audio recorder applet, when users uploaded
> the recorded file all at the same time. After a reboot, another part of
> the exam with other kind of questions also produced the same system
> slowness and halt.
>
> We use Samigo 2.9.2 on Sakai 2.9.2 and the system which collapsed had
> the next configuration (1). Now we have extended that system to this one
> (2).
>
> And soon we are going to have another test with a high number of users.
> We plan to monitor that test and try to look into the results to find
> what has happened in case it fails. Or maybe send these results to the
> list so other more expert users can have a look on it.
>
> We are going to use YourKit to store the JVM internal use and JConsole
> to watch memory and CPU usage. If somebody can provide some advice about
> other tools or procedures that we could use to have better and more
> useful results, we would be very grateful.
>
> Of course, if our configuration has any bottleneck or if any work has
> been done on this performance topic in Samigo's code, I would like to
> know in order to fix it here if I can.
>
> Many thanks in advance.
> Best regards.
>
> -------------------------------
>
> (1) 1 active Tomcat.
>
> Processor:
>
> http://ark.intel.com/products/27219/Intel-Xeon-Processor-5160-4M-Cache-3_00-GHz-1333-MHz-FSB?wapkw=5160
>
> JAVA_OPTS: '-server -d64 -Xms10000m -Xmx10000m -XX:PermSize=512m
> -XX:MaxPermSize=512m -Djava.awt.headless=true -Dhttp.agent=Sakai
> -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false
> -Dsun.lang.ClassLoader.allowArraySyntax=true -Duser.language=es
> -Duser.region=ES -Dsakai.cookieName=SAKAISESSIONID
> -XX:+UseConcMarkSweepGC -XX:+ExplicitGCInvokesConcurrent
> -XX:+CMSIncrementalMode'
>
> (2) 2 active Tomcat.
>
> Processor 1:
>
> http://ark.intel.com/products/27219/Intel-Xeon-Processor-5160-4M-Cache-3_00-GHz-1333-MHz-FSB?wapkw=5160
>
> Processor 2:
>
> http://ark.intel.com/products/52583/Intel-Xeon-Processor-E5606-8M-Cache-2_13-GHz-4_80-GTs-Intel-QPI
>
>
> JAVA_OPTS: '-server -d64 -Xms11000m -Xmx11000m -Xmn3g -XX:PermSize=512m
> -XX:MaxPermSize=512m -Djava.awt.headless=true -Dhttp.agent=Sakai
> -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false
> -Dsun.lang.ClassLoader.allowArraySyntax=true -Duser.language=es
> -Duser.region=ES -Dsakai.cookieName=SAKAISESSIONID
> -XX:+UseConcMarkSweepGC -XX:+ExplicitGCInvokesConcurrent
> -XX:+CMSIncrementalMode'
>
> --
> Daniel Merino Echeverría
> daniel.merino at unavarra.es
> Gestor de E-learning - Centro Superior de Innovación Educativa.
> Tfno: 948-168489 - Universidad Pública de Navarra.
>
> _______________________________________________
> samigo-team mailing list
> samigo-team at collab.sakaiproject.org
> http://collab.sakaiproject.org/mailman/listinfo/samigo-team
>
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