From: Brian Candler <b.candler@...>
Date: 2011-05-08T23:07:28+09:00
Subject: Re: Threading Loops

rename is almost certainly disk limited - doing them in parallel is 
almost certainly not going to be faster. In any case, Ruby threads are 
not true threads, only one executes at once (in MRI anyway, other 
implementations like JRuby are different)

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