Friday, February 20, 2009
lisp time function
I am noticing that the results of the time function when I run it on my system are in seconds. Thus most of the results are rounded to 0.0 secs for runtime, etc. As far as I can tell, the time function has no other parameters than the form being timed. I am wondering if anyone has figured out how to force the time function to output in any smaller unit of time.
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Run your code a thousand times in a loop inside the time function to find the time in milliseconds :D
ReplyDeleteIf you're using a *ix box, you can use the time command if you can figure out how to invoke the interpreter in a non-interactive mode.
ReplyDeleteI think he's more interested in a lisp function that generates the same output as in the sample:
ReplyDeleteUSER(110): (time (loop for x from 1 to 1000 do ( + x x)))
; cpu time (non-gc) 130 msec user, 10 msec system
; cpu time (gc) 140 msec user, 0 msec system
; cpu time (total) 270 msec user, 10 msec system
; real time 390 msec
; space allocation:
; 24,125 cons cells, 0 symbols, 88,120 other bytes
NIL
As opposed to this, which I'm getting and he is too, apparently:
Real time: 0.0 sec.
Run time: 0.0 sec.
Space: 45764 Bytes