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It was a “JVM performance week” in JRuby-land. It all started when some recent code changes is JRuby caused an interesting performance degradation with JDK6 on multi-core CPUs. See the original post to the [jvm-l] list and extended coverage of what happened on Charlie’s blog. So, while following the discussion and participating, I learned few new things and got some interesting additional info and links that I’d like to share.