Checking Memory Usage Of WebApps within a Tomcat instance

[Frank Misa <fr...@hotmail.com>]

Hi All,Can someone here confirm....Does Tomcat provide tooling/API to allow checking/monitoring of how much memory usage each webapp deployed within a Tomcat instance is using?I've checked the forums and found some references to:     Java5+/Java6 tooling which uses these VM options:     -XX:HeapDumpPath=C:\Java\heapdump -XX:+HeapDumpOnOutOfMemoryError -XX:+PrintGCDetailsAlso some third party tools:     Hyperic HQ etc.But both these approaches look VM centric -- i.e. I don't think you'll be able to see which webapps/threads are using what resources relative to eachother ?Any thoughts would be appreciated.... can this be easily done ?ThanksFrank
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RE: Checking Memory Usage Of WebApps within a Tomcat instance

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

> From: Frank Misa [mailto:frankmisa@hotmail.com] 
> Subject: Checking Memory Usage Of WebApps within a Tomcat instance
> 
> Does Tomcat provide tooling/API to allow checking/monitoring 
> of how much memory usage each webapp deployed within a Tomcat
> instance is using?

Not directly (nor does any other web or app server).  There's one heap
per JVM, and all webapps allocate out of it.  If you have some unique
objects in each webapp, a profiler can easily show you those, but
there's no way to differentiate who allocated common objects other than
by looking at the walkback stack at the time of each allocation.
Collecting such information can be expensive, since you may have to
record quite some depth in order to get back to the significant webapp
entry.

 - Chuck


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