I'm not sure the Java data are significant -- all you are seeing there is
the overhead for executing JavaScript from Java. The Java itself has
nothing to do with it, since the loop is in JavaScript.
Note that you need to use .slice() not .slice(0). The latter just pulls
the first value out.
On Fri, Dec 18, 2015 at 2:43 PM, Rolf Huehne <rhue...@leibniz-fli.de> wrote:
> On 12/18/2015 09:05 PM, Robert Hanson wrote:
> > Oh, yes. .slice() copies all or part of an array.
> >
> The independence of 'n' was caused because the elements of the copied
> array were all undefined. I have changed the test and filled the array
> with values first:
>
> ---- Jmol script --------------------------
> jsCommand = "n=1000000; a = new Array(n); for (var i = a.length;--i >=
> 0;) {a[i] = i;} t1=performance.now(); b = a.slice(0);
> t2=performance.now(); c = new Array(n); for (var i = a.length;--i >= 0;)
> { c[i] = a[i] } t3=performance.now(); dt1= t2 - t1; dt2= t3 - t2; a[5] =
> -5; msg='slice: ' + dt1 + 'ms copy: ' + dt2 + 'ms a[5]=' + a[5] + '
> b[5]=' + b[5] + ' c[5]=' + c[5]; alert(msg)";
> javascript @jsCommand;
> ---------------------------------------------
>
> Now 'slice' also depends on 'n':
> Firefox/HTML5: 4ms
> Firefox/Java: 4ms
> Chromium/HTML5: 10ms
> Chromium/Java: 7ms
>
> And the new values for 'copy' are:
> Firefox/HTML5: 500ms
> Firefox/Java: 4000ms
> Chromium/HTML5: 700ms
> Chromium/Java: 130ms
>
> Bob and others, do you have any idea why there is such a huge
> performance difference in running the same Javascript code from
> JSmol/Java or JSmol/HTML5 and that in a different direction for Firefox
> and Chrome?
>
> Regards,
> Rolf
> --
>
> Rolf Huehne
> Postdoc
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--
Robert M. Hanson
Larson-Anderson Professor of Chemistry
Chair, Department of Chemistry
St. Olaf College
Northfield, MN
http://www.stolaf.edu/people/hansonr
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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