Created
July 30, 2011 13:33
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micro-benchmark for property access
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| function bench(x) { | |
| for (var i = 0; i < 10000000; i++) { | |
| if (x.foo) x.baz; | |
| if (x.bar) x.mur; | |
| if (x.dng) x.foo; | |
| if (x.baz) x.bar; | |
| if (x.mur) x.dng; | |
| } | |
| } | |
| if (typeof console === "undefined") console = {log: print}; | |
| var obj = { | |
| foo: "foo", | |
| bar: "bar", | |
| dng: "dng", | |
| baz: "baz", | |
| mur: "mur" | |
| }; | |
| for (var k = 0; k < 10; k++) { | |
| var start = new Date().getTime(); | |
| bench(obj); | |
| console.log(new Date().getTime() - start); | |
| } |
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| hannes@t61:~/git/rhino$ node -v | |
| v0.5.3-pre | |
| hannes@t61:~/git/rhino$ node getprop.js | |
| 740 | |
| 738 | |
| 738 | |
| 739 | |
| 738 | |
| 737 | |
| 740 | |
| 738 | |
| 738 | |
| 738 | |
| hannes@t61:~/git/rhino$ java -version | |
| java version "1.7.0" | |
| Java(TM) SE Runtime Environment (build 1.7.0-b147) | |
| Java HotSpot(TM) Server VM (build 21.0-b17, mixed mode) | |
| hannes@t61:~/git/rhino$ java -jar build/rhino1_7R3/js.jar getprop.js | |
| 817 | |
| 748 | |
| 742 | |
| 783 | |
| 730 | |
| 730 | |
| 730 | |
| 730 | |
| 729 | |
| 733 |
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This is on a 3 year old thinkpad with current ubuntu and 32 bit os and jvm. Are you using the latest version from the invokedynamic branch? Oh, and i it's the server HotSpot VM of course (as shown in the version info)
I'd like to repeat what I said in my posting to the mailing list - this benchmark doesn't have any significance for real world code. In fact I'd even say it is slightly disappointing.