Re: [Haskell-cafe] Foreign function performance: monadic vs pure

Serguei Son writes:

Also, please note that I can force the evaluation of c_sin, e.g.

mapM (return . c_sin) [1..n] >>= (print $ foldl' (+) 0)

And it will still execute reasonably fast.

Pls disregard the my previous post. I actually meant let lst = map c_sin [1..n] print $ foldl' (+) 0 lst This executes in 0.2 s for n = 10^7. c_sin is safe, as well as c_sin_m. The only difference is CDouble -> CDouble vs CDouble -> IO CDouble.