In the openfire/bin directory, add a vmoptions file.  The first part of the name of the vmoptions file should be the same as the executable running the Openfire service.  For example, on Windows running as a service, you'd create a file named openfire-service.vmoptions.  Among other things in this file, you can define the minimum and maximum memory to allocate to the process in the Java VM.

For example:

-Xms512m
-Xmx1024m

It's worth noting that you're bound to the 32 bit 2 GB limit on memory size for the Java VM.  While the process may need a certain amount of memory, Java also needs a certain amount.  It's all taken out of the same 2 GB space for the Java VM.  Giving the process all the available memory space (2 GB) leaves nothing for Java.  Allocating up to 1 GB for the process (see the above example) seems to be a good mark.

The vmoptions file is used to override the defaults used by Openfire and is not included with the installation.  On Linux, create a plain text file /opt/openfire/bin/openfire.vmoptions and enter your memory options.  My previous post has an example format.

Where would you add that line 6 in a windows 2003 install ?

I can't seem to find /opt/openfire anywhere in this openfire folder, don't know if I've missed something but

I think I have been through every sub folder and cannot find it

in /etc/sysconfig/openfire

add:

OPENFIRE_OPTS="-Xms256m -Xmx512m"

or whatever settings you want.

Hi Amol,

do you mind posting the first 10 lines of the openfire start script which you did modify to set the Xmx value?

LG

if you used the /etc/sysconfig/openfire option you would need to restart openfire for the settings to be noticed. In fact for any of the solutions here you would need to restart openfire.

service openfire restart

(on Fedora + Redhat based systems)

I just ran into a problem where my Java VM memory was pegged. I increased it from 64mb to 256mb and all is well for now. My question is what should be an acceptable limit for 400 users? Also are switching to Spark as the client if that makes a difference for this?

Thanks