I have the following script:
function Test(){}
Test.F = function(){}
Test.F.FF = function(){}
Test.F.FF.FFF = function(){}
Test.F.FF.FFF.F FFF = function(){}
//var alias = function(){};
var alias = Test.F.FF.FFF.F FFF;
var date1 = new Date();
for (var index = 0; index < 100000; index++)
Test.F.FF.FFF.F FFF();
//alias();
var date2 = new Date();
print(date2.get Time() - date1.getTime() );
Why is it when I use Test.F.FF.FFF.F FFF() I get around 100ms and when I
get alias() I get around 280ms?
What is going on here? This is something I would have never anticipated
and I think that neither of you as well. Aliases whould work faster
then doing lockups at each iteration, right?
Also if I uncomment this line: var alias = function(){}, from 280ms I
get a drop to 265 ms?
Does anybody now the reason for this? It only happends in Firefox (I
have 1.5.0.6). IE and Opera behaive as they should
22  2064 
Daniel Rucareanu wrote:
<snip>
Why is it when I use Test.F.FF.FFF.F FFF() I get around 100ms and
when I get alias() I get around 280ms?
What is going on here? This is something I would have never
anticipated and I think that neither of you as well. Aliases whould
work faster then doing lockups at each iteration, right?
Also if I uncomment this line: var alias = function(){}, from 280ms I
get a drop to 265 ms?
Given the relatively low resolution and precision of javascript date
objects, and the influence of task switching on the processor, I would
not trust results from measurements of periods as short as this.
Does anybody now the reason for this? It only happends in Firefox (I
have 1.5.0.6). IE and Opera behaive as they should
If the effect is real, and particular to Firefox then asking the people
who wrote the javascript engine for Firefox may help. They:-
netscape.public .mozilla.jseng
Richard.
The precision of js date objects is indeed kind of low, but more the
enough when measuring durations larger than a few hundred milliseconds.
Also I don't think that tasks / threading switching have any influence,
because the result are constant, no matter how may time I run this
test. I also increased the loop from 100K iterations to 1M and the
results stay the same: using the alias is a lot slower.
Richard Cornford wrote:
Daniel Rucareanu wrote:
<snip>
Why is it when I use Test.F.FF.FFF.F FFF() I get around 100ms and
when I get alias() I get around 280ms?
What is going on here? This is something I would have never
anticipated and I think that neither of you as well. Aliases whould
work faster then doing lockups at each iteration, right?
Also if I uncomment this line: var alias = function(){}, from 280ms I
get a drop to 265 ms?
Given the relatively low resolution and precision of javascript date
objects, and the influence of task switching on the processor, I would
not trust results from measurements of periods as short as this.
Does anybody now the reason for this? It only happends in Firefox (I
have 1.5.0.6). IE and Opera behaive as they should
If the effect is real, and particular to Firefox then asking the people
who wrote the javascript engine for Firefox may help. They:-
netscape.public .mozilla.jseng
Richard.
Daniel Rucareanu wrote:
Why is it when I use Test.F.FF.FFF.F FFF() I get around 100ms and when
I get alias() I get around 280ms?
I get different results than you: http://javascripttoolbox.com/temp/fu...peed_test.html
Using alias for me is always almost twice as fast in Firefox 2 beta 2,
10%-25% faster in FF 1.5, and 15%-20% faster in IE6.
Try my url and see if you get the same results.
In any case, doing a lookup 100,000 times and only taking 100-200ms total
surely makes these results insignificant.
--
Matt Kruse http://www.JavascriptToolbox.com http://www.AjaxToolbox.com
Strange enough, I get results close to you. Probably must have
something to do the fact the functions are passed as parameters... even
the total executions time, in both situations are smaller. Anyway, this
complicates thing even more, rather than answering them.
I have posted this on another forum as well and there people have
confirmed by results. You might want to try with my test as well, just
to see what kind of result you get.
In FF 2, beta 2, using my test, the alias() test runs 3 times more
slowly that the other test. Also, the fact the 100,000 iterations take
about 200ms is because the application is extremely simple. Rest assure
then in more complex applications with a lot of object, heavy dom usage
etc., the results will be different.
Thank you,
Daniel
Matt Kruse wrote:
Daniel Rucareanu wrote:
Why is it when I use Test.F.FF.FFF.F FFF() I get around 100ms and when
I get alias() I get around 280ms?
I get different results than you:
http://javascripttoolbox.com/temp/fu...peed_test.html
Using alias for me is always almost twice as fast in Firefox 2 beta 2,
10%-25% faster in FF 1.5, and 15%-20% faster in IE6.
Try my url and see if you get the same results.
In any case, doing a lookup 100,000 times and only taking 100-200ms total
surely makes these results insignificant.
--
Matt Kruse
http://www.JavascriptToolbox.com
http://www.AjaxToolbox.com
Daniel Rucareanu wrote:
<snip>
confirmed by results. You might want to try with my test as well, just
to see what kind of result you get.
<snip>
Firefox 1.5.0.6 gives me - alias() - running in about 3/4 of the time
that - Test.F.FF.FFF.F FFF() - takes, with your code. Your case is not
demonstrated.
Richard.
Richard Cornford wrote:
Firefox 1.5.0.6 gives me - alias() - running in about 3/4 of the time
that - Test.F.FF.FFF.F FFF() - takes, with your code. Your case is not
demonstrated.
Same here. Are you sure that your posted code is actually your complete test
case?
--
Matt Kruse http://www.JavascriptToolbox.com http://www.AjaxToolbox.com
Yes, the test case is complete. Hoever, for testing I was using an
online environment that evaluates whatever code you write. It suited me
fine until now when I needed just a quick way to test something. It
seems that is has something to do with it. Creating a standalone page
and running it does creates some more plausible results.
Strange that this is the first time the environments in giving me
results other then what a real page would give. If anybody want to run
the test there and to check the result, the url is: http://www.squarefree.com/jsenv/.
In IE and Opera however, running the test in this environment or
running the standalone page gives the same results...
Now I wonder why 2 persons (whom I don't know) confirmed my first
results... :) What were they using?
Daniel
Matt Kruse wrote:
Richard Cornford wrote:
Firefox 1.5.0.6 gives me - alias() - running in about 3/4 of the time
that - Test.F.FF.FFF.F FFF() - takes, with your code. Your case is not
demonstrated.
Same here. Are you sure that your posted code is actually your complete test
case?
--
Matt Kruse
http://www.JavascriptToolbox.com
http://www.AjaxToolbox.com
Daniel Rucareanu wrote:
Yes, the test case is complete. Hoever, for testing I was using an
online environment ...
<snip>
http://www.squarefree.com/jsenv/.
<snip>
And that online environment branches its execution based upon a - !!
document.all - test, so no comparison of its results on different
browsers will be meaningful.
Richard.
Daniel Rucareanu wrote:
Yes, the test case is complete. Hoever, for testing I was using an
online environment that evaluates whatever code you write.
http://www.squarefree.com/jsenv/.
Ah, so you weren't just testing the speed of your test case, but also the
speed of any code wrapped around it to make the "environmen t" function.
These are important details not to be left out in the original post ;)
BTW, if you want to do speed tests, take a look at the code in the url I
posted in a previous message. I wrote the timeIt() function because I was
tired of manually doing the new Date() thing before and after, and I wanted
side-by-side comparisons of multiple ways of doing the same task. It's been
working nicely for me for a while.
One caveat: When testing long-running functions or many iterations, browsers
will usually pop up the "code is running slow" messages. Disable these in
your browser before doing speed tests.
--
Matt Kruse http://www.JavascriptToolbox.com http://www.AjaxToolbox.com This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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