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JRuby Roundup: 1.1.1 with Profiler, Startup Performance Boost, GSoC '08

by Werner Schuster on May 06, 2008 |
The JRuby 1.1.1 release provides mostly bug fixes for JRuby 1.1, like a fix for a bug causing problems with IBM JDKs. See the release notes for a complete list of bug fixes and improvements.

One new feature is the --profile flag. This launches JRuby with JIP - The Java Interactive Profiler enabled. JIP is now part of the JRuby distribution and comes with configuration to make it work with JRuby's class loaders (JIP works using Java's instrumentation feature which allows modification of bytecodes). Note: JIP profiles the bytecode of the JRuby runtime and the bytecode generated at runtime.

Continuing the JRuby performance work, JRuby's Charles Nutter discovered a way to improve JRuby's startup performance:
I just committed a change to the JRuby startup scripts that boosts startup speed by almost 70% (for me). It loads the JRuby jars (and CLASSPATH) into bootclasspath instead of normal classpath, bypassing verification (and apparently other things, since this is way faster than -Xverify:none). It should also be a safe change; JRuby's core should have been verified a kajillion times before release, and code generated at runtime will be verified as normal.
JRuby is also represented in the Google Summer of Code (GSoC) 2008 with a few projects:

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