[Haskell-cafe] No Derived Read for Unboxed Arrays

Neil Mitchell ndmitchell at gmail.com
Thu Jan 25 19:10:34 EST 2007


> I was trying to convert some code from ordinary boxed array to unboxed
> arrays for performance reasons.

> However my code ultimately failed because
> I load a large array saved as a text file using the derived Read, Show
> mechanism.

I found that Read was maybe 30 times slower than the slowest binary
serialisation method I could possibly think of. If performance matters
to you, and the array is more than a few elements long, switching away
from Read/Show should be the first step - before going for unboxed

(But of course, having Read/Show defined for UArray may well be
useful, and sounds a good idea)



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