[erichocean]

Would have been nice if the title was "Twitter survives election after Ruby-to-Scala move", since that's what actually happened.

(They do use a bit of regular Java, but the majority of the core code is Scala, and it's Scala that should be getting the top line credit here, not Java.)

[taligent]

No. It is the JVM that should be getting the credit.

[erichocean]

If that were the case, they could have just run JRuby and avoided rewriting a bunch of code.

The truth is, Scala is actually helpful with the architecture they came up with AND its great that it runs on the JVM.

[suresk]

I'm not necessarily disagreeing with you (static typed languages are going to be faster on the JVM), but JRuby - partially with the help of invokedynamic, added in Java 7 - has come a long way performance-wise since Twitter began their rewrite.

I wonder if they would have done anything different, had JRuby been where it is now?

[spullara]

JRuby, even when using a lot of Java based libraries, doesn't get you the performance boost you need — it is just incremental over Ruby and even then only with some code.

[thebluesky]

...except that JRuby is 3-100x slower than Java: http://shootout.alioth.debian.org/u64q/benchmark.php?test=al...

[igouy]

No, JRuby is not 3-100x slower than Java.

Those 10 tiny tiny Ruby programs are 3-100x slower than the Java programs written for the tasks.

[otibom]

Magnetised needles and steady hands.