Monitoring uPortal memory at runtime

Added by Andrew Petro, last edited by Andrew Petro on Aug 23, 2006

There are several approaches to monitoring uPortal memory at runtime.

Stub

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Quick and Dirty JSP

Slapping a JSP like this into /tomcat/webapps/portal/ and accessing it at https://my.someschool.edu/portal/memory.jsp provides quick bare bones memory status.

memory.jsp
<%
Runtime runtime = Runtime.getRuntime();

// bytes of free momory       
long freeMemory = runtime.freeMemory();
        
// maximum memory the JVM will try to use, in bytes
long maxMemory = runtime.maxMemory();
        
// total memory
long totalMemory = runtime.totalMemory();
%>


<html>
<head>
<title>Tomcat memory</title>
</head>
<body>
<table>
<tr>
<td>Label</td>
<td>Bytes</td>
</tr>

<tr>
<td>Free memory</td>
<td><%=freeMemory%></td>
</tr>

<tr>
<td>Max memory</td>
<td><%=maxMemory%></td>
</tr>

<tr>
<td>Total memory</td>
<td><%=totalMemory%></td>
</tr>

</table>
</body>
</html>

Tomcat Manager

The Tomcat Manager web application provides some server memory statistics (as well as a wealth of other information).

JMX monitoring tricks

You can connect a JMX GUI or other tool to a running JVM and see all sorts of interesting information about it.

Administrative runtime data channel

There's a lovely IChannel for monitoring a uPortal.

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