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Why is everyone so concerned with multi-core concurrency withi languages like Python and Ruby? Adding another processor will get you, best case, a 2x speedup. Rewriting in, say, OCaml or Haskell will get you a 25x speedup.

25 processors buys you a lot of programming time.




Adding another processor to my computer is quick and easy. Rewriting an application in another language is slow and hard.




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