Monday, September 12, 2005

Kowari Memory Leak Found and Fixed

Chris Wilper and his team at The Fedora Project have been embedding Kowari within Fedora for some time. They recently uncovered a memory leak which is caused by a failure to properly clean up unused FreeList$Phase objects in one of the FreeList constructors. The problem shows up when doing many inserts and deletions. Chris quickly tracked down the cause and submitted a patch. Paul G has looked at it, albeit briefly, and will write a test to catch the problem. I expect that Chris' patch will be committed to the Kowari CVS shortly.

All Kowari and Tucana Knowledge Server users should take note of this one! The memory leak exists in both the Kowari 1.0 series and the 1.1 prereleases (including nightly snapshots from CVS), and TKS 2.0 and 2.1 (at least). I suspect (but have not yet verified) that the TKS 1.X series is also affected. The final fix will be in Kowari 1.1 when it comes out in the fourth quarter of this year.

A nice before-and-after plot shows the memory leak and the behavior following Chris' fix.


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