Re: Mysterious slowdown in Chromium

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From	Stefan Weiss <krewecherl@gmail.com>
Newsgroups	comp.lang.javascript
Subject	Re: Mysterious slowdown in Chromium
Date	Sun, 06 Jan 2013 17:33:19 +0100
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On 2013-01-06 16:25, Gregor Kofler wrote:
> Checked this on Chromium 22 (Ubuntu AMD64) in the web developer console
> 
> (function bench() {
>    function test() {}
>    var runs = 10000000,  // adjust as needed
>    t0 = +new Date();
>    while (runs--) test();
>    console.log((+new Date() - t0) + "ms");
> })();
> 
> Execution time stays constant with 90ms to 95ms.

Interesting. Running this here always takes around 2650ms. It appears
that function expressions and function declarations exhibit the problem
differently:

function bench2() { ... as before ... }

var bench3 = function () { ... as before ... };

bench3();   -> 2655ms
bench3();   -> 2652ms
bench2();   -> 18ms
bench2();   -> 59ms
bench2();   -> 64ms
bench2();   -> 62ms
bench2();   -> 60ms
bench2();   -> 57ms
bench2();   -> 61ms
bench2();   -> 303ms
bench2();   -> 303ms
bench2();   -> 300ms
bench2();   -> 301ms
bench2();   -> 301ms
bench2();   -> 2653ms
bench3();   -> 2648ms
bench3();   -> 2652ms

Must be an old bug in my Chromium version. I guess I won't be doing any
more benchmarks until I can find the time to upgrade my OS :)

Thank you (and GGolf and Scott) for testing!

- stefan

Thread

Mysterious slowdown in Chromium Stefan Weiss <krewecherl@gmail.com> - 2013-01-06 15:12 +0100
  Re: Mysterious slowdown in Chromium GGolf <invalid@invalid.com> - 2013-01-06 20:22 +0530
  Re: Mysterious slowdown in Chromium Gregor Kofler <usenet@gregorkofler.com> - 2013-01-06 16:25 +0100
    Re: Mysterious slowdown in Chromium Stefan Weiss <krewecherl@gmail.com> - 2013-01-06 17:33 +0100
      Re: Mysterious slowdown in Chromium Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2013-01-06 23:44 +0100
  Re: Mysterious slowdown in Chromium Scott Sauyet <scott.sauyet@gmail.com> - 2013-01-06 08:19 -0800
  Re: Mysterious slowdown in Chromium Patricia Shanahan <pats@acm.org> - 2013-01-06 08:32 -0800

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