time

Lib.time : ('a -> 'b) -> 'a -> 'b

Measure how long a function application takes.

An application time f x starts a clock, applies f to x, and then checks the clock to see how long that took. It prints out the elapsed runtime, garbage collection time, and system time before returning the value of f x.

Failure

If f x raises e, then time f x raises e, but still reports elapsed time.

Example

> time (int_sort) (for 0 999 I);
runtime: 0.01140s,    gctime: 0.00885s,     systime: 0.00971s.
val it =
   [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
    21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
    39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56,
    57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74,
    75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92,
    93, 94, 95, 96, 97, 98, 99, ...]: int list

> fun f x = f (x + 1);
val f = fn: int -> 'a

> time f 0; (* would need interrupting *)

See also

Lib.end_time, Lib.start_time, Count.thm_count