Recommended JVM Parameters for Master and ClientManager (v 6.1.0)

What are the recommened JVM parameters for a master and client manager running on the same Linux machine?
Current VM Specs:
OS: Suse Linux
Processor Count: 4
Physical Memory: 8GB
Using Java: jdk1.6.0_13
Current Master Params: JVMARGS=-Xms2048m -Xmx2048m
Current Client Manager Params: JVMARGS=-Xms2048m -Xmx2048m -XX:PermSize=128m -XX:MaxPermSize=128m
Recommendations would be appreciated.
Thanks!
Grant Alexander

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New FAQ Entry on JVM Parameters for Large Cache Sizes

I've posted a new [FAQ entry|http://www.oracle.com/technology/products/berkeley-db/faq/je_faq.html#60] on JVM parameters for large cache sizes. The text of it is as follows:
What JVM parameters should I consider when tuning an application with a large cache size?
If your application has a large cache size, tuning the Java GC may be necessary. You will almost certainly be using a 64b JVM (i.e. -d64), the -server option, and setting your heap and stack sizes with -Xmx and -Xms. Be sure that you don't set the cache size too close to the heap size so that your application has plenty of room for its data and to avoided excessive full GC's. We have found that the Concurrent Mark Sweep GC is generally the best in this environment since it yields more predictable GC results. This can be enabled with -XX:+UseConcMarkSweepGC.
Best practices dictates that you disable System.gc() calls with -XX:-DisableExplicitGC.
Other JVM options which may prove useful are -XX:NewSize (start with 512m or 1024m as a value), -XX:MaxNewSize (try 1024m as a value), and -XX:CMSInitiatingOccupancyFraction=55. NewSize is typically tuned in relationship to the overall heap size so if you specify this parameter you will also need to provide a -Xmx value. A convenient way of specifying this in relative terms is to use -XX:NewRatio. The values we've suggested are only starting points. The actual values will vary depending on the runtime characteristics of the application.
You may also want to refer to the following articles:
* Java SE 6 HotSpot Virtual Machine Garbage Collection Tuning
* The most complete list of -XX options for Java 6 JVM
* My Favorite Hotspot JVM Flags
Edited by: Charles Lamb on Oct 22, 2009 9:13 AM

First of all please be aware HSODBC V10 has been desupported and DG4ODBC should be used instead.
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Thanks in advance

Start here:
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http://java.sun.com/docs/hotspot/
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Ron,
Thanks for the general advice. That's what I thought, but sometimes we
all need a sanity check. Especially when you see java thread death
messages when the distributor starts up :-) Not due to the JVM.
> In General, use the JVM version that shipped at the same time as the
NetWare
> Service Pack you're using.
>
> For NetWare 6 this still gives you the choice between JVM 1.3.x and
1.4.x,
> my preference is the JVM 1.4.2 as it has better performance then the
1.3.x.
> The 1.4.2_6 your using is quit stable, no major issues known.
>
> Ron
>
>
> <[email protected]> wrote in message
> news:MaeMe.444$[email protected]..
> > Quick question - what is the recommended version of the NetWare JVM
to use
> > with ZfS 6.5 SP1? I'm running NW6SP5, ZfS65 with SP1 applied, and
Tomcat
> > 3.3. Right now I'm using JVM 1.4.2_6 and just wanted to verify there
are
> no
> > known issues with JVM 1.4.2_6 playing well with ZfS 6.5 SP1. Running
on on
> > a 2 node cluster.I plan to add ZfD 6.5 SP1 to the cluster soon -
primarily
> > for HA inventory services. Thanks in advance for any input.
>
>

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Edited by: bsrao on Oct 11, 2012 6:07 PM
Edited by: bsrao on Oct 11, 2012 6:10 PM
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Recommended JVM Parameters for Master and ClientManager (v 6.1.0)

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