Perf Profiling

Are there any tools available for performance profiling? It takes a
few seconds to move a window on the device I'm interested in
experimenting with, and I'm wondering where those seconds are going.

Also, are there any configuration options that might affect/improve
performance when running on top of Mobile Safari?

--
Casey Ransberger

Hi, Casey

Safari has a nice profiler that can be enabled and disabled at runtime.
It can also be manually triggered with console.profile() and
console.profileEnd().

Best,

Jens

Am 03.05.10 10:30, schrieb Casey Ransberger:
> Are there any tools available for performance profiling? It takes a
> few seconds to move a window on the device I'm interested in
> experimenting with, and I'm wondering where those seconds are going.
>
> Also, are there any configuration options that might affect/improve
> performance when running on top of Mobile Safari?
>
>    

You can also use Dan's internal Lively profiler:

lively.lang.Execution.installStackTracers()
lively.lang.Execution.trace(function() {
        new lively.ide.SystemBrowser().open();
});

The profiler can also be enabled in the World menu under Tools... -> Enable profiling.
The tools submenu will then have several profiling options (also a profiling help).

Best,
Robert



On May 3, 2010, at 11:34 AM, Jens Lincke wrote:

Hello Casey -

>Are there any tools available for performance profiling? It takes a
>few seconds to move a window on the device I'm interested in
>experimenting with, and I'm wondering where those seconds are going.
>
>Also, are there any configuration options that might affect/improve
>performance when running on top of Mobile Safari?

I assume you are interested in an iPhone or iPad.  So am I, and I hope to have some reasonable adaptation of the touch events available soon.  The JS performance is a bit sad.

Using my benchmark page, http://weather-dimensions.com/Dan/JavaScriptBenchmark.html

On my 2-year old Mac Powerbook (2.4 GHz Core 2 Duo) I get
        815M simple ops/sec
        33M sends/sec

On the iPad I get
        28M simple ops/sec
        0.8M sends/sec

On my iPhone I get
        19M simple ops/sec
        0.4M sends/sec

Methinks they have some work to do on code generation for the Arm, or else some other optimizations.  I would expect maybe 5x or 10x slower on the iPad, but 30x-40x?  Come on.

I hope this isn't a conspiracy to ensure that Lively Apps can't compete :-(.

Let's ask around...  ;-)

        - Dan

PS:  re profiling:  My JS scheme is very cool, since it is independent of browser support, however I think that the FF and Safari tools are now easier to use and will probably serve you better.

They do still have value (I need to write this up) because they are editable, and can be used, eg, for tracing, or marking all procedures that have run (or not run), etc, etc.

At Phil's suggestion, I just tried Opera mini and AtomicWeb.  Opera Mini is twice as fast but seems only to be an iPhone app (tiny screen) at this time.

iPad numbers for Opera Mini are...
        50M simple ops/sec
        1.7M sends/sec

AtomicWeb gives essentially the same numbers as Safari; it's probably a Webkit browser.

        - Dan