From http://www.petefreitag.com/item/821.cfm

heap.cfm

<cfset mf = CreateObject("java", "java.lang.management.ManagementFactory")>
<cfset memBean = mf.getMemoryMXBean()>
<cfset heapMem = memBean.getHeapMemoryUsage()>
<cfset nonHeapMem = memBean.getNonHeapMemoryUsage()>

<cfoutput>
Heap Memory: #Round(heapMem.getUsed()/1024/1024)#mb In Use 
	(#Round(heapMem.getCommitted()/1024/1024)#mb Committed,
	 #Round(heapMem.getMax()/1024/1024)# Max Allowed Size)<br />

Non Heap Memory (PermGen & Code Cache): #Round(nonHeapMem.getUsed()/1024/1024)#mb In Use 
	(#Round(nonHeapMem.getCommitted()/1024/1024)#mb Committed,
	 #Round(nonHeapMem.getMax()/1024/1024)# Max Allowed Size)
</cfoutput>