Tomcat 6 Manager App question (Memory usage)

[Jacob Rhoden <ja...@rhoden.id.au>]

Hi,

The manager application status page reports the following regarding 
memory usage:

Free memory: 0.86 MB Total memory: 9.35 MB Max memory: 63.56 MB

I am confused about what this means. What is the difference between 
total memory and max memory. Is the free memory what is left of total 
memory, or maximum memory?

Best Regards,
Jacob

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RE: Tomcat 6 Manager App question (Memory usage)

["Caldarale, Charles R" <Ch...@unisys.com>]

> From: Jacob Rhoden [mailto:jacob@rhoden.id.au] 
> Subject: Tomcat 6 Manager App question (Memory usage)
> 
> Free memory: 0.86 MB Total memory: 9.35 MB Max memory: 63.56 MB
> 
> What is the difference between total memory and max memory.

Total memory is the current size of the heap (somewhere between the -Xms
and -Xmx values); max memory is the upper bound on heap size (-Xmx).
Free memory is the amount of total memory that is not currently
allocated to objects.

A list of useful references:
http://java.sun.com/javase/technologies/hotspot/gc/index.jsp

 - Chuck


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