On Thu, 1 Jul 2010 19:51:06 +0200
Peter Schuller <[email protected]> wrote:
> > Is anyone using anything more sophisticated than clojure.core/time for
> > benchmarking clojure code?
>
> No, but last time I thought about this I figured a very simple
> (benchmark ...) would simply:
>
> * Iterate with exponentially higher repeat counts until total runtime
> reaches >= 1 second (say).
> * Then, iterate with the same count until the timing over some period,
> say 10 seconds, has a sufficiently low standard deviation.
> * Then, take that repeat count and re-run enough to reach, say, 10
> seconds, of time.
>
> Obviously the 1, 10 and std dev thesholds would be selectable, with
> some default. So that in the normal case for micro-benchmarking, you'd
> just do:
>
> (benchmark (run-my-stuff))
>
> And it would usually "just work" even if run-my-stuff is a trivial
> function that completes really really quickly (due to the exponential
> growth).
>
> Thoughts? It's obviously not meant for really serious benchmarking,
> but I think it would be a good thing to have in cases where one might
> now otherwise use (time ..).
This is pretty much where I was heading when I started writing those
two macros. Wanting to be able to time very short runtimes without
timing the loop, I wrote loop-timer to deal with loop overhead. Only
to have it return negative values in the process of trying to get a
reasonable total run time. This makes that process, um, interesting.
<mike
--
Mike Meyer <[email protected]> http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.
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