Major performance slowdown when loading AOT compiled file
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Key: JRUBY-2714
URL: http://jira.codehaus.org/browse/JRUBY-2714
Project: JRuby
Issue Type: Bug
Components: Performance
Affects Versions: JRuby 1.1.2
Reporter: Peter K Chan
In my project, which has1500+ files, the performance of the app slows down
dramatically when the files are compiled AOT and loaded, as opposed to purely
interpreting the unpacked source file.
Some load time numbers from my own app, from start until application is ready:
pure interpretation: 4s
most files AOT compiled, -Xverify:none: 16 s
most files AOT compiled, (verification on): 18s
It does not appear that verification is responsible for the majority of the
slowdown (only 2 addition seconds of overhead).
I don't have an automated test case ready now, but a manual way of verifying
the performance would be to AOT compile a ruby library (e.g. ActiveRecord), JAR
up the files in ar.jar, and then compare the performance of "require
'activerecord'" with either parsing and interpreting, or with the compiled
classes.
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