runtime JVM options

[Victor Cheung]

Hi,

I can't determine the JBoss process id so I can't use jinfo.

But also, what I would like to see are *all* VM options/parameters... including options that were not explicitly defined when starting JBoss, but runtime (default) options that are set by the VM.

Basically I'd like to take an inventory of all options used by the VM when it is running.  Is this possible?


victor

-----Original Message-----
From: Y Srinivas Ramakrishna [mailto:Y.S.Ramakrishna at Sun.COM]
Sent: Thursday, December 11, 2008 2:20 PM
To: Victor Cheung
Cc: hotspot-gc-use at openjdk.java.net
Subject: Re: runtime JVM options


% ${JDK}/bin/jinfo -flags <pid>

It should give you a list of the specified C.L. options like so:

-XX:+UseConcMarkSweepGC -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -Xmx2g

If you want the value of a specific flag that you did not specify on
the command line, you can ask:

% ${JDK}/bin/jinfo -flag -flag CMSMarkStackSizeMax <pid>

And you might get back for example:

-XX:CMSMarkStackSizeMax=4194304

I do not know of a universal jinfo query which will dump all
extant flags though.

-- ramki

----- Original Message -----
From: Victor Cheung <VictorC at ganz.com>
Date: Thursday, December 11, 2008 8:47 am
Subject: runtime JVM options
To: "hotspot-gc-use at openjdk.java.net" <hotspot-gc-use at openjdk.java.net>


> Hihi all,
>
> I cannot seem to find the answer to this.  How can we get a list of
> *all* the options and values that a running JVM is using?
>
> victor
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