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Surprise Me!
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By bloid
via infoq.com
Published: Jul 01 2009 / 10:47

MacRuby Drops GIL, Gains Concurrent Threads
Threading in Ruby has always been a troublesome issue. Ruby 1.8 implements userspace threads with performance problems and also don't make use of multiple cores. Ruby 1.9 switched to mapping every Ruby thread to a kernel thread, which removes some of the inefficiencies in 1.8's threads - yet still only one Ruby thread can run at a time.
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