[maemo-developers] javascript perf on the n770 and n800

[From: Fred Lefévère-Laoide]

Sean Jensen-Grey a écrit :
> I was wondering what the js perf is on the n770 and n800?
> 
> LowTideGames just wrote a game for the iPhone using a fair bit of
> javascript and the <canvas> tag. But JS perf is so horribly slow 
> that it does not run. Initially we thought it was a
> poorly implemented <canvas> tag, this is not the case. Canvas tag runs
> fine. It is javascript itself that is slow on the iPhone.
> 
> It appears that a NOP function takes about 70 microseconds. In our tests,
> 1000 executions of a function which does nothing took 74 milliseconds on
> the iPhone.
> 
> There is a thread over on ajaxian about js perf on the iphone, and links
> to,
> 
> http://celtickane.com/projects/jsspeed.php
> 
> iphone results,
> 
> http://ajaxian.com/archives/iphone-javascript-and-spec-benchmark
> 
> Could someone run the above benchmark (jsspeed) on an N770 and N800 and reply to this message?
> We would like to to an idea of how much js compute power is available on
> embedded internet devices. Esp Opera 9 embedded vs, iPhone Safari.
> 
> We also have a benchmark that measures the speed of the canvas tag.
> 
> http://lowtidegames.com/test/shapesonly.html
> 
> Note: This script posts the results of the test back to our server so we
> could record the results from the iPhone.
> 
> jsspeed on a macbookpro, various browers, all times in milliseconds
> 
> firefox 2.0.0.4
> 
> Try/Catch with errors   52
> Layer movement  148
> Random number engine    126
> Math engine     209
> DOM speed       160
> Array functions         70
> String functions        196
> Ajax declaration        46
> Total Duration  1007 ms
> 
> Safari 3
> 
> Try/Catch with errors   6
> Layer movement  45
> Random number engine    37
> Math engine     56
> DOM speed       27
> Array functions 14
> String functions        15
> Ajax declaration        10
> Total Duration  210 ms
> 
> Opera 9.21
> 
> Try/Catch with errors   13
> Layer movement  135
> Random number engine    100
> Math engine     124
> DOM speed       59
> Array functions 56
> String functions        62
> Ajax declaration        40
> Total Duration  589 ms
> 
> Sean
> 
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> maemo-developers at maemo.org
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> 
> 


Nokia N800

Try/Catch with errors   183
Layer movement  1418
Random number engine    1928
Math engine     3422
DOM speed       4983
Array functions 1007
String functions        709
Ajax declaration        933
Total Duration  14583 ms

iPhone class I suppose ...

Fred