Memory leak

Added by Andrew Petro, last edited by Andrew Petro on Aug 21, 2006  (view change)

This page is a place to hang some documentation about the uPortal memory leak that seems to have been introduced between uP 2.0 and uP 2.1.

Showing the leak

A Rutgers graph

Free memory (as reported by the OS?). The big vertical jumps are JVM restarts.

Yale graphs

Daily

Weekly

Notice the decreasing trend: over time each GC results in less memory reclamation with the eventual result (takes > 1 week) of running out of memory. A slow memory leak. Early Sunday morning we take an outage for database maintenance and take that opportunity to restart the uPortal context, thereby restoring our free memory to baseline.

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Comments (1)

 

  1. Apr 08, 2005

    James Janssen says:

    What versions of uPortal were used in the above graphs? I would be interested to...

    What versions of uPortal were used in the above graphs? I would be interested to see the difference with the UPortal 2.15 (2.3.4 backport) Memory Leak Patches applied.

    re: up215memleaks.zip, I found in the clearinghouse.

    We applied this some time ago and it seemed to help, but we do not yet have access to a profiler to report its effects in our production environment.