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Posted to users@tomcat.apache.org by Mitesh Shah <mi...@eclinicalworks.com> on 2007/09/24 23:33:03 UTC
Vmware and Tomcat 5.x & 6.x
Hi,
I am fairly new to this user group.
I have deployed Tomcat 5.0 and Tomcat6.0 on our Virtualized environment;
consist of ESX 3.0 servers with Clarion storage.
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.
Previously, I have deployed tomcat in our physical server environment and
it's running absolutely fine with all performance tunning in place but same
is not working in virtual environment.
I was hoping to get some input as if anyone is aware of such issue of vmware
and tomcat.
Please let me know if you need any further details about components used in
our deployment or any details pertinent to this issue.
Thank you in advance.
Mitesh
Re: Vmware and Tomcat 5.x & 6.x
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Mitesh,
Mitesh Shah wrote:
> Thanks Chris for reply. Clarion is SAN, so all are data and OS partitions
> are on SAN.
Okay. That shouldn't be a problem.
> 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).
OMG that is a /lot/ of Tomcat instances. How many request-handler
threads do you have configured for each?
> On similar line, does JDK takes advantage of two CPU compared to
> one CPU?
You didn't say what JDK version you are using, but unless you have
something that is seriously out of date, the JDK will use as many CPUs
as you have available to the VM.
> I can reconfigure Swap file on separate disks than OS disk and see if it
> performs better.
With 20 JVMs running on a 4GB machine, I'd say that swapping is going to
be a huge problem. Try running a single instance to see how it works
out. If that is reasonably fast, then try adding more instances until it
starts to suck. Then, check your swap file usage and I'll bet you'll see
that at some point, you start to heavily swap. You're not seeing Tomcat
hosing... you're seeing your OS thrashing.
- -chris
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Re: Vmware and Tomcat 5.x & 6.x
Posted by Gabe Wong <ga...@ngasi.com>.
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:chris@christopherschultz.net]
> Sent: Monday, September 24, 2007 6:01 PM
> To: Tomcat Users List
> Subject: Re: Vmware and Tomcat 5.x & 6.x
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> 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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> VSqAodugC0GLy8LRk5In52I=
> =nMgC
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>
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>
--
Regards
Gabe Wong
Private JVM JAVA Hosting Automation
http://www.ngasi.com
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RE: Vmware and Tomcat 5.x & 6.x
Posted by Mitesh Shah <mi...@eclinicalworks.com>.
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:chris@christopherschultz.net]
Sent: Monday, September 24, 2007 6:01 PM
To: Tomcat Users List
Subject: Re: Vmware and Tomcat 5.x & 6.x
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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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=nMgC
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Re: Vmware and Tomcat 5.x & 6.x
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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
-----BEGIN PGP SIGNATURE-----
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VSqAodugC0GLy8LRk5In52I=
=nMgC
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