How can I go about getting a program\'s running time through system time functions in Haskell? I would like to measure the execution time of a whole program and/or an individual
1) If you want to benchmark something, use the criterion package.
2) If you want to time a function and are positive you have controlled for laziness as needed, then just use Data.Time.getCurrentTime
from the time package.:
import Data.Time
...
start <- getCurrentTime
runOperation
stop <- getCurrentTime
print $ diffUTCTime stop start
A slicker packaging of the above pattern can be found in the timeit package.
3) If you actually want the running time of a program that just happens to be written in Haskell then use your systems time
utility. For most POSIX systems (Mac, Linux) just run:
$ time ./SomeProgram
And it will report user, wall, and system time.