Thanks...will try these settings as they are better than what I have now!
On 10/21/2011 9:31 AM, Nathaniel, Alfred wrote:
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.pelss...@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:pjos...@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:pjos...@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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