primitive hinted fns will get inlined. You can also play the same kinds of
games that Clojure does with definterface+deftype and fns that declare
:inline metadata.
If you don't want to learn the subtleties of Clojure performance tuning
then you can always write your performance critical bits in Java and call
into it. Some folks, like the people at Prismatic, seem to be doing pretty
well writing all their performance critical code in Clojure, but they've
built some tools to avoid the various potential pitfalls.
On Thu, Apr 25, 2013 at 9:19 AM, Alice <dofflt...@gmail.com> wrote:
> I create many small methods in java without worrying about the
> performance since it's usually the target of inline optimization. For
> example,
>
> public class Foo {
> public static long inc(long l) {
> return ++l;
> }
>
> public static long f1() {
> long l = 0;
> for (int i=0; i < 1000000000; i++) {
> l++;
> }
> return l;
> }
>
> public static long f2() {
> long l = 0;
> for (int i=0; i < 1000000000; i++) {
> l = inc(l);
> }
> return l;
> }
> }
>
> (time (Foo/f1))
> (time (Foo/f1))
> (time (Foo/f1))
> (time (Foo/f2))
> (time (Foo/f2))
> (time (Foo/f2))
>
> "Elapsed time: 23.309532 msecs"
> "Elapsed time: 23.333039 msecs"
> "Elapsed time: 21.714753 msecs"
> "Elapsed time: 22.943366 msecs"
> "Elapsed time: 21.612783 msecs"
> "Elapsed time: 21.71376 msecs"
>
>
> But clojure funtions seem to be never get inlined.
>
> (def obj (Object.))
>
> (defn getObj [] obj)
>
> (defn f1 [] obj)
> (defn f2 [] (getObj))
>
> (time (dotimes [n 100000000] (f1)))
> (time (dotimes [n 100000000] (f1)))
> (time (dotimes [n 100000000] (f1)))
> (time (dotimes [n 100000000] (f2)))
> (time (dotimes [n 100000000] (f2)))
> (time (dotimes [n 100000000] (f2)))
>
> "Elapsed time: 67.758744 msecs"
> "Elapsed time: 68.555306 msecs"
> "Elapsed time: 68.725147 msecs"
> "Elapsed time: 104.810459 msecs"
> "Elapsed time: 103.273618 msecs"
> "Elapsed time: 103.374595 msecs"
>
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