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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