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0 pointserichocean13y ago0 comments

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.

0 comments

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?

spullara13y ago

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.

thebluesky13y ago

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

igouy13y ago

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.

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