OpenRuby.com

16 Oct '12, 4am

So you want to optimize Ruby:

I was recently asked for a list of "hard problems" a Ruby implementation really needs to solve before reporting benchmark numbers. You know...the sort of problems that might invalidate early perf numbers because they impact how you optimize Ruby. This post is a rework of my response...I hope you find it informative! Fixnum to Bignum promotion In Ruby, Fixnum math can promote to Bignum when the result is out of Fixnum's range. On implementations that use tagged pointers to represent Fixnum (MRI, Rubinius, MacRuby), the Fixnum range is somewhat less than the base CPU bits (32/64). On JRuby, Fixnum is always a straight 64-bit signed value. This promotion is a performance concern for a couple reasons: Every math operation that returns a new Fixnum must be range-checked. This slows all Fixnum operations. It is difficult (if not impossible) to predict whether a Fixnum math opera...

Full article: http://blog.headius.com/2012/10/so-you-want-to-optimize-r...

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