Measure time of execution in F#

Question

Please post code for displaying time in F#. I noticed that you can measure it from F# interactive with #time directive, but I don\'t know how to execute program from FSI

Answer 1

Check out the timer function in the F Sharp Programming wikibook. It is defined like this:

let duration f = 
    let timer = new System.Diagnostics.Stopwatch()
    timer.Start()
    let returnValue = f()
    printfn "Elapsed Time: %i" timer.ElapsedMilliseconds
    returnValue    

Whilst being used like this:

let sample() = System.Threading.Thread.Sleep(2)

duration ( fun() -> sample() )
// or
duration sample