[Haskell-cafe] forkIO on multicore

[Jake McArthur]

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Paul Keir wrote:
> fibs = 0 : 1 : zipWith (+) fibs (tail fibs)

This is a CAF (Constant Applicative Form). Since it is actually a
constant it is never garbage collected, and is always shared, so each
thread is only calculating it once. You have essentially created a
lookup table.

- - Jake
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