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 Post subject: Random Apache Tomcat Question
PostPosted: Wed Aug 29, 2012 12:23 
SupaMod
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Bit of a shot in the dark here.

If I'm running an embedded version of Tomcat, that doesn't expose the usual configuration details, is there any way to find out from a running process what parameters it's running under?

Specifically, I've got a process running that is a tomcat process. I want to know what its Java memory allocations are, both maximum and initial. Is there any way to find out? From the Java console, perhaps?

Ta

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 Post subject: Re: Random Apache Tomcat Question
PostPosted: Wed Aug 29, 2012 12:27 
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Windows or Unix? ps aux on unix will do the trick. You're looking for the -Xmx command line parameter.


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 Post subject: Re: Random Apache Tomcat Question
PostPosted: Wed Aug 29, 2012 12:28 
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Tomcat problems, eh? I know the feeling.

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 Post subject: Re: Random Apache Tomcat Question
PostPosted: Wed Aug 29, 2012 12:29 
SupaMod
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Blatent c/p
Quote:
To find out how much RAM is allocated already to your Tomcat instance, if you have Tomcat installed as a Windows service, you can run Regedit and look at:

HKEY_LOCAL_MACHINE
SOFTWARE
Apache Software Foundation
Procrun 2,0
Under that key will be all the tomcat service instances you have installed on that machine. If you expand an instance tree you will see another key named Parameters. Expand this and you will see a number of named values:

JvmMs - is the minimum memory, equivalent to -Xms
JvmMx - is the maximum memory equivalent to -Xmx
Options - any other java options you wish to set for this server.
When you run Tomcat as a service it calls the jvm.dll directly so anything you modify in one of the bat files will be disregarded. So you will need to set those options by changing those registry values. The default Tomcat configuration does not use any memory configuration. If you haven't set the -Xms or -Xmx parameters explicitly anywhere you will wind up with the JDK default which is 64M.

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 Post subject: Re: Random Apache Tomcat Question
PostPosted: Wed Aug 29, 2012 12:31 
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That won't work if some other process has started Tomcat, and Craster specifically said "embedded".


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 Post subject: Re: Random Apache Tomcat Question
PostPosted: Wed Aug 29, 2012 12:34 
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It's on Windows. Basically, I'm doing an idiots guide. I've set the -xmx and -xms parameters in the registry, and I'm doing a 'validation' step where I need to find a way of confirming that they've actually typed the reg keys correctly and that the running Tomcat instance is actually using those parameters.

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 Post subject: Re: Random Apache Tomcat Question
PostPosted: Wed Aug 29, 2012 12:54 
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Just tell Task Manager to show the full command line. That should do it.


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 Post subject: Re: Random Apache Tomcat Question
PostPosted: Wed Aug 29, 2012 13:04 
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Hmm. Can't do that on 2003, but using WMIC from the command line to grab the list of running processes did the job. Cheers!

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 Post subject: Re: Random Apache Tomcat Question
PostPosted: Wed Aug 29, 2012 13:09 
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Good oh.

For future reference, you can also connect to running JVMs from jConsole and get data out; but it's more long winded than just using the command line.


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