Cfmx7 Taking 100% of Processor (Web becomes unresponsive)

Question

The server in question has been running fine for weeks at a time, until recently.
After  a reboot (because of a Kernel upgrade for RHEL) it started acting up.  Roughly every 12 hours, the cfmx7 process becomes unresponsive, and takes up  about 100% of the CPU.  This makes the server seem unresponsive to web requests.   The only message in the log when this happens is "java.lang.OutOfMemoryError"  over and over until the process is killed and the service is restarted.  I've already tried upping the memory in the JVM, but still no fix.  Any other  thoughts?
Configuration Info:
JVM Arguments:
-server -Dsun.io.useCanonCaches=false -XX:MaxPermSize=256m -XX:PermSize=128m -XX:NewSize=48m -Dcoldfusion.rootDir={application.home}/../ -Dcoldfusion.libPath={application.home}/../lib
Min JVM Heap = 1024MB
Max JVM Heap = 1536MB

Answer 1

If you are using a 32-bit RHEL version, then i think you are setting your Min and Max heap too high. On paper, a JVM (1.4 and up) running on a 32-bit OS can be allocated a maximum of 1.6, although in CF, this is not always true. By experience, the max you can allocated CF on 32-bit is 1.3-1.4, and that's just OS and CF. If you a have a 64-bit OS, on paper, you can go and set it up a full 4.gb. See this blog by Steve E. --- http://www.talkingtree.com/blog/index.cfm/2007/8/29/CF8-Performance-64-bit
My suggestion is to start your Min/512 - Max/1024, then monitor your performance. Also, since you are running CFMX7, then I suggest you take some java stack traces to see what's going on under the hood. Here's the link --- http://kb2.adobe.com/cps/183/tn_18339.html
HTH
Melvin T.