[plt-dev] Apply/List vs Call-with-values/vector->values

On Mon, Feb 22, 2010 at 10:37 AM, Jay McCarthy <jay.mccarthy at gmail.com> wrote:
> How should I expect these two lines to compare performance-wise:
>
> (apply make-prefab-struct
>                    (vector->list v))
>
> vs
>
> (call-with-values (lambda () (vector->values v))
>                               make-prefab-struct)

#lang scheme

(define v '#(foo 1 2 3))

(define k 1000000)

(define (run1)
  (for ((i (in-range k)))
    (apply make-prefab-struct
           (vector->list v))))


(define (run2)
  (for ((i (in-range k)))
    (call-with-values (lambda () (vector->values v))
                      make-prefab-struct)))

(time (run1))
(time (run2))

cpu time: 1068 real time: 1075 gc time: 60
cpu time: 864 real time: 866 gc time: 44




-- 
sam th
samth at ccs.neu.edu