InvokeDynamic is JRuby's switchboard. Dynamic calls get compiled to raw assembly, all inlined: Ruby into Java, Java into Ruby. Pure JVM magic. #JRuby #JVM #InvokeDynamic

Moving from CRuby to JRuby dropped one app from 20 extra large EC2 instances to 10 medium ones. Tens of thousands of dollars saved with a better runtime. #JRuby #EC2 #CloudCosts

JRuby is fully parallel on the JVM, which exposes thread-unsafe Ruby code. The fix was years of educating the Ruby community about thread-safe programming. #JRuby #Concurrency #Ruby

A $50 ticket, 60 people, and a Java dev who understood every Ruby slide. That's how Charles Nutter walked into RubyConf 2004 and ended up building JRuby. #JRuby #Ruby #Java

#whysfoxes #WhysPoignantGuideToRuby #WPGTRPage29 #ruby #jruby #chunkybacon #RubyLanguage #RubyLang

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