Timing computations
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Timing an IO computation.
import Text.Printf
import Control.Exception
import System.CPUTime
time :: IO t -> IO t
time a = do
start <- getCPUTime
v <- a
end <- getCPUTime
let diff = (fromIntegral (end - start)) / (10^12)
printf "Computation time: %0.3f sec\n" (diff :: Double)
return v
main = do
putStrLn "Starting..."
time $ product [1..10000] `seq` return ()
putStrLn "Done."
And running this.
$ runhaskell A.hs
Starting...
Computation time: 1.141 sec
Done.
See also Timing out computations.