Selectively Disable JIT Compiler using command line options
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Key: JRUBY-2679
URL:
http://jira.codehaus.org/browse/JRUBY-2679 Project: JRuby
Issue Type: Improvement
Components: Compiler
Affects Versions: JRuby 1.1.2, JRuby 1.1.1
Environment: All Operating Systems and All Hardware
Reporter: Chase Wolfinger
Attachments: SelectivelyDisableJIT.patch
After running into a performance issue with the JIT compiler and the append_features method, I believe it is desireable to selectively disable the JIT compiler in order to work around these types of issues until a permanent fix can be applied to the root cause. In order to due this, I have patched the following two files:
src/org/jruby/RubyInstanceConfig.java - Added a new java property "jruby.jit.exclude" that accepts a list of modules, classes, and methods to exclude from the JIT compiler. The list is separated by a "," with the modules, classes and methods defined with the "::" separator. Global / singleton methods are prefixed with a "-". For example to disable the JIT for the "append_features" then the following JVM argument will work -Djruby.jit.exclude=-::append_features.
src/org/jruby/compiler/JITCompiler.java - Added a check on the configuration to determine if the method should be excluded from the JIT. The check is a two step check - exclude everything in a module or class OR exclude the specific method.
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