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OutOfMemoryError in 9k on code with very large methods #3016

bbrowning opened this Issue Jun 3, 2015 · 2 comments


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commented Jun 3, 2015

When running TorqueBox 4's rubocop task under JRuby 9k, we sometimes get an OutOfMemoryError. After some debugging on IRC, it looks like the very large advance method in the parser gems' lib/parser/lexer.rb is causing a non-fatal OOM in the JIT compiler which ends up backing up the JIT queue and eventually OOMing the entire application in a fatal way.

Here's a gist of the OOMs with jit logging enabled -

@headius headius closed this in c406290 Jun 3, 2015

@headius headius added this to the JRuby milestone Jun 3, 2015


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commented Jun 4, 2015

I mentioned this on IRC, but to make sure you see it this commit forgot to adjust Constants.JIT_MAX_SIZE_LIMIT from 30,000 down to a value of 2,000. Thus, unless I run with -Xjit.maxsize=2000, I still see the OOMs happening.


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commented Jun 5, 2015

I adjusted this yesterday (note for posterity).

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