How to get a program's running time in Haskell

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臣服心动
臣服心动 2021-02-04 12:10

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

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  •  囚心锁ツ
    2021-02-04 12:52

    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.

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