Profiling the Java Code

Mark Finkle mfinkle at mozilla.com
Tue Jan 21 07:34:44 PST 2014


Not sure how that link got borked, but here is where the profiles live: 

[1] http://people.mozilla.org/~mfinkle/fennec/profiles 

----- Original Message -----

> Now that some improvements have been landing, I ran some newer profiles [1]
> for startup and pageload. Feel free to download them and load them into
> Montior/DDMS to look for new problem areas. I'll keep appending the date to
> the profile names so we can keep track over time.

> [1] http://people.mozilla.org/~mfinkle/fennec/profiles

> ----- Original Message -----

> > For many of the pageload performance bugs [1], we used profiles of the Java
> > code to uncover the issues. This is just a quick post covering what you
> > need
> > to do in order to get profiles.
> 

> > 1. The Fennec build needs to be "debuggable" [2]. Nightlies are not, but
> > local developer builds are.
> 
> > 2. For profiling pageload, you can generally use Monitor/DDMS [3]. Just
> > press
> > the "start method tracing" button, load a page, wait, press the "stop
> > method
> > tracing" button.
> 
> > 3. For profiling startup time, you really need to add
> > Debug.startMethodTracing(...) and Debug.stopMethodTracing(). I added a
> > simple patch [4] to show what I mean.
> 

> > I created some example profiles for startup and pageload. You can download
> > them [5] and open them in Monitor/DDMS using the "File | Open File..."
> > menu.
> 

> > [1] https://bugzilla.mozilla.org/show_bug.cgi?id=947390
> 
> > [2]
> > http://developer.android.com/guide/topics/manifest/application-element.html#debug
> 
> > [3] http://developer.android.com/tools/debugging/debugging-tracing.html
> 
> > [4]
> > http://people.mozilla.org/~mfinkle/fennec/profiles/startup-tracing.patch
> 
> > [5] http://people.mozilla.org/~mfinkle/fennec/profiles
> 
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