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From "Nathaniel, Alfred" <Alfred.Nathan...@six-group.com>
Subject RE: scaling problem
Date Fri, 21 Oct 2011 13:31:13 GMT
Java GC tuning is something of a black art.
The default settings are not suitable for a large servlet container, and they also depend
on the Java version.

I don't have experience with Java7 but with jdk1.6.0_24 (SPARC Solaris) we are using:

-server -d64 -XX:CodeCacheMinimumFreeSpace=10M -XX:ReservedCodeCacheSize=100M -Xms6000m -Xmx6000m
-XX:PermSize=300m -XX:MaxPermSize=300m -Xloggc:/home/online/tomcat_cocoon0a_1/logs/gc.log
-XX:+PrintGCTimeStamps -XX:+PrintGCDetails -XX:+PrintTenuringDistribution -XX:+UseConcMarkSweepGC
-XX:+UseParNewGC -XX:NewRatio=4 -XX:SurvivorRatio=6 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=5
-XX:MaxGCPauseMillis=5000

Look at the gc.log output and GC generation sizes to find out whether you have a memory leak,
too little memory, or are wasting memory.
Remember that with a 64bit JVM all your pointers are twice as big.
At 3500M your are just at the limit what can be reached with 32bit.
You can also try -XX:+UseCompressedOops to reduce memory in the 64bit JVM.

HTH, Alfred.

-----Original Message-----
From: Robby Pelssers [mailto:Robby.Pelssers@nxp.com] 
Sent: Freitag, 21. Oktober 2011 15:05
To: users@cocoon.apache.org
Subject: RE: scaling problem

Ow.. not sure about that.. I'd almost think not but you better check to be sure.

-----Original Message-----
From: Paul Joseph [mailto:pjoseph@gmail.com] 
Sent: Friday, October 21, 2011 3:04 PM
To: users@cocoon.apache.org
Subject: Re: scaling problem

Ah interesting...does it apply to Cocoon 2.1.11 (should have mentioned 
earlier, that's what I am using.)


On 10/21/2011 8:44 AM, Robby Pelssers wrote:
> For what it's worth... check this thread and see if this applies:
> http://www.mail-archive.com/users@cocoon.apache.org/msg45665.html
>
> Robby
>
> -----Original Message-----
> From: Paul Joseph [mailto:pjoseph@gmail.com]
> Sent: Friday, October 21, 2011 2:42 PM
> To: users@cocoon.apache.org
> Subject: scaling problem
>
> Hi there,
>
> I have been supporting a cocoon app for several years and it has been
> quite successful when about 10 users are accessing it at the same time,
> in the 32 bit Windows/Tomcat envrionment.
>
> Now, the app is being used by larger groups and in higher numbers.  So I
> put it on in Windows 64 bit, using the new JDK 7 64 bit release and
> Tomcat 64, all on a server class machine.
>
> I specified max memory to be 3500 MB.
>
> A recent load test showed that searches are a problem.  When a user runs
> a search and retrieves 1000 records, after several users doing this
> several times, the JVM runs out of memory.
>
> I estimate it takes a retrieval of a total of 500,000 records (adding up
> each user's queries) before the server runs out of memory...
>
> I tried the new garbage collector by specifying in Tomcat's Java options
> -XX:+UseG1GC  but this seems to have little effect.
>
> Any suggestions would be appreciated.
>
> thx.
> Paul
>
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