22 Jun '12, 5pm

Concurrency in JRuby | Engine Yard Ruby on Rails Blog:

First, a new mental model is needed. Although JRuby is just another Ruby implementation, it’s also a new tool running on a completely different VM, the Java Virtual Machine, which has performance characteristics much different than Ruby’s VM. These characteristics vary due to the use of native threads compared to green threads, the JVM’s sophisticated garbage collection facilities, and most importantly JRuby’s own codebase. So your assumptions about how code works do not carry across Ruby implementations. Code that previously ran slow may now be fast and vice versa.

Full article: http://www.engineyard.com/blog/2011/concurrency-in-jruby/

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