Mitesh,
The most important thing with regards to the JVM, is available memory.
Of extra importance in this case is the amount of memory (REAL/PHYSICAL)
allocated to the Virtual Environment (VMWare). That said, you also need
to determine the Memory Heap usage of each of the JVM instances.
Sluggishness usually indicates a memory shortage. At that point SWAP
consumption increases. As you would image disk swap would be much
slower than real memory. Besides sluggishness, SWAP usage may increase
the chance of disk failure because essentially you are using a 100% of
resources. In short compare the total Memory Heaps of all the JVMS to
the total memory allocated to the Virtual Environment of the VMWare
instance.
Mitesh Shah wrote:
Thanks Chris for reply. Clarion is SAN, so all are data and OS partitions
are on SAN.
Whole server works fine but our application works using tomcat and I have
installed around 20 instances of tomcats on one virtual machine (2.66GHz and
4GB RAM). On similar line, does JDK takes advantage of two CPU compared to
one CPU?
I can reconfigure Swap file on separate disks than OS disk and see if it
performs better.
Please let me know if above info helps in understanding issue better?
Mitesh Shah
Hosted Services Engineer
-----Original Message-----
From: Christopher Schultz [mailto:[EMAIL PROTECTED]
Sent: Monday, September 24, 2007 6:01 PM
To: Tomcat Users List
Subject: Re: Vmware and Tomcat 5.x & 6.x
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Mitesh,
Mitesh Shah wrote:
This is first ever deployment of our product on virtual environment and we
are facing lots of issues of slowness. There are too many variables to
monitor and looking for some path to follow.
Is the whole server slow, or do you notice that certain operations are slow?
I was hoping to get some input as if anyone is aware of such issue of
vmware
and tomcat.
AFAIK, there are no Tomcat-specific vmware issues. However, there could
be some problems with the JVM in general that you might be coming
across. For instance, if you are using a source of randomness that
blocks when used through the virtual environment, that might cause a
problem. Also, if you are using non-native disks (meaning a big file on
the host OS that holds the entire filesystem for the VM), you may
experience some slowdown, there.
I'm not sure what Clarion is... could that be a problem at all?
- -chris
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Regards
Gabe Wong
Private JVM JAVA Hosting Automation
http://www.ngasi.com
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