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Comment on Why GNU grep is Fastparent

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> One counter-example I can think of is that of Judy trees - http://judy.sourceforge.net/ which uses more instructions to try to keep the data in cache for as long as possible.

It's not a counter-example. The cost of running a program includes the cost to access memory as well as the cost of executing instructions. It also includes the cost to access disk/flash.

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