jruby
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Blog: November 30, 2009: Why Object-Oriented Languages Need Tail
[Note: The original blog post used the term "tail-recursion", but in response to feedback on December 1, I have replaced this term with "tail calls" to emphasize that the issue has to do with multiple objects calling each others' methods, not just the limited case of an object invoking its own methods or the even more limited case of a single method invoking itself (whether on the same object or another object). Also, some minor errors in the code examples have been corrected as of December 3.] We recommend an interesting essay from the recent ACM OOPSLA Conference: William R.
J is for JVM: Why the ‘J’ in JRuby? | Engine Yard Blog
The current JRuby team members are all passionate hackers with intimate knowledge of Ruby, Java, and of course JRuby. That said, none of us were on the team at the project’s original inception. I assume the JRuby pioneers thought JRuby would be a good idea—I know I did, when I first heard about it. For a lot of folks though, it’s somewhat less obvious. Why is writing JRuby on top of the JVM a good idea, they ask.JRuby has made great progress with regards to performance. A year ago, JRuby was the fastest implementation for Ruby 1.8 code. JRuby performance has been raised with every release, and further improvements are on the horizon with the new intermediate representation (IR) that is beeing developed by Subbu Sastry. Strictly speaking, the AST (abstract syntax tree) is also an IR (intermediate representation) – since it is not quite the source, and not quite the target language. An IR, in the abstract, is a representation (in-memory data structures, output "assembly", etc.) that has been chosen to capture the semantics of the source language but that also best enables the implementation in place. Given that JRuby started off as an interpreter (the best and easiest way to get a reference / prototype implementation of a language), and had to be fully compliant with the C MRI implementation which operates off the AST (and possibly other reasons), the AST makes sense as the IR of choice.
JRuby's New IR Paves the Way for Future Performance Improve
jvm languages performance
On Tue, Nov 17, 2009 at 6:48 AM, Rich Hickey ... @gmail.com> wrote: > I think it is essential to separate the *two* problems with boxed > numbers. One problem is arithmetic with boxed numbers.