My biggest problem with JRuby really wasn’t server performance or multithread - it was start time. If you used JRuby for something like scripting then you feel

My biggest problem with JRuby really wasn’t server performance or multithread - it was start time. If you used JRuby for something like scripting then you feel it way more. Try using it for a map reduce process on large data workloads in Hadoop and you see the startup time of JRuby materially. Q: Why would one do that? A: Ability to bundle your code to hadoop machines you don’t control