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http://jira.codehaus.org/browse/RVM-812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=179735#action_179735 ]
Steve Blackburn commented on RVM-812:
-------------------------------------
I did apply a number of systematic fixes for this problem which were quite effective.
Since then I've noticed we still see quite a few failures. Daniel and I did some analysis (just looking through cattrack, not investigating the individual errors), and they don't appear to be connected to the move to GenImmix. a) there are underlying random OOME errors that happened both before and after the move to Immix. b) the total number of failures went up significantly after the move to biased locking, but at first glance, those errors don't appear to be specifically related to biased locking (so it may just be that it has tickled out some longstanding bugs).
So in summary: I believe I have fixed the OOME errors related to immix (they were due to problems with defrag, which had not been properly tested in a generational setting). There are quite a few "random" errors at the moment, but they seem correlated with biased locking (though not necessarily directly due to it).
Finally, Daniel has made a stab at producing a cute little graphic which shows bugs as pixels over time, allowing one to visually correlate various bugs with time. It is not ready for prime time yet, but perhaps he can share the script. :-)
> Increase in failures in small heap perf runs since switch to GenImmix as production
> -----------------------------------------------------------------------------------
>
> Key: RVM-812
> URL:
http://jira.codehaus.org/browse/RVM-812> Project: RVM
> Issue Type: Bug
> Affects Versions: 3.1.0
> Reporter: David Grove
> Assignee: Steve Blackburn
> Priority: Minor
> Fix For: 3.1.1
>
>
> Since switching to GenImmix for the performance runs, there has been a marked increase in the number of "3GC" runs that fail due to OOM. We should either figure out why Immix seems to require slightly more memory to run these tests and fix it or increase the heap size used for the tight heap performance tests.
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