From: Gregory Collins g...@gregorycollins.net
On Mon, Apr 11, 2011 at 3:55 PM, Serguei Son serguei@gmail.com
wrote:
So if I must use a safe function returning IO a,
there is no way to improve its performance? To give you
a benchmark, calling gsl_ran_ugaussian a million times
in
On Mon, 2011-04-11 at 12:09 +, Serguei Son wrote:
Consider two versions of sin wrapped:
foreign import ccall math.h sin
c_sin_m :: CDouble - IO CDouble
and
foreign import ccall math.h sin
c_sin :: CDouble - CDouble
One can invoke them so:
mapM c_sin_m [1..n]
mapM (return .
On Mon, Apr 11, 2011 at 10:14 AM, Maciej Marcin Piechotka
uzytkown...@gmail.com wrote:
main = mapM (\x - return $! c_sin_u) [1..n]
0.012 s
This should be
main = mapM (\x - return $! c_sin_u x) [1..n]
--
Felipe.
___
Haskell-Cafe mailing list
Felipe Almeida Lessa felipe.lessa at gmail.com writes:
On Mon, Apr 11, 2011 at 10:14 AM, Maciej Marcin Piechotka
uzytkownik2 at gmail.com wrote:
main = mapM (\x - return $! c_sin_u) [1..n]
0.012 s
This should be
main = mapM (\x - return $! c_sin_u x) [1..n]
So if I must use a
Serguei Son serguei.son at gmail.com writes:
Felipe Almeida Lessa felipe.lessa at gmail.com writes:
On Mon, Apr 11, 2011 at 10:14 AM, Maciej Marcin Piechotka
uzytkownik2 at gmail.com wrote:
main = mapM (\x - return $! c_sin_u) [1..n]
0.012 s
This should be
main =
Serguei Son serguei.son at gmail.com 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
On Mon, Apr 11, 2011 at 8:09 AM, Serguei Son serguei@gmail.com wrote:
Consider two versions of sin wrapped:
foreign import ccall math.h sin
c_sin_m :: CDouble - IO CDouble
Marking this call as unsafe (i.e. foreign import ccall unsafe math.h
sin) can improve performance dramatically. If
On Mon, Apr 11, 2011 at 3:55 PM, Serguei Son serguei@gmail.com wrote:
So if I must use a safe function returning IO a,
there is no way to improve its performance? To give you
a benchmark, calling gsl_ran_ugaussian a million times
in pure C takes only a second or two on my system.
In the C
