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From bugzi...@apache.org
Subject [Bug 54143] New: Add display of PermGen memory pool usage to the Status page of the Manager webapp
Date Tue, 13 Nov 2012 22:39:44 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=54143

          Priority: P2
            Bug ID: 54143
          Assignee: dev@tomcat.apache.org
           Summary: Add display of PermGen memory pool usage to the Status
                    page of the Manager webapp
          Severity: enhancement
    Classification: Unclassified
                OS: Windows XP
          Reporter: knst.kolinko@gmail.com
          Hardware: PC
            Status: NEW
           Version: 7.0.32
         Component: Manager
           Product: Tomcat 7

It would be nice to add display of the PermGen memory pool usage to the Status
page of the Manager webapp.

This is because OutOfMemoryError's caused by PermGen pool exhaustion are fatal
for the server and are hard to predict, as they are are not visible from the
simple Free/Max/Total Heap statistics.

Technically speaking, the information is provided by "MemoryPool" MBeans. It is
easier to display all memory pools at once rather than to search for specific
one.

The beans could be obtained via a query, e.g. [1], but it is much easier to use
standard API that is available in Java SE [2].

[1]
http://localhost:8080/manager/jmxproxy/?qry=java.lang%3Atype%3DMemoryPool%2C*
[2]
http://docs.oracle.com/javase/6/docs/api/java/lang/management/MemoryPoolMXBean.html

I have an implementation ready and will commit it shortly.

A small question is whether it is suitable for the simple "Server Status" page
or is better for the "Complete Server Status" one. I think it is OK on the
simple page, as this information is important.

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