Profiling the Java Code
mfinkle at mozilla.com
Tue Jan 21 07:29:37 PST 2014
Now that some improvements have been landing, I ran some newer profiles  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.
----- Original Message -----
> For many of the pageload performance bugs , 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" . Nightlies are not, but
> local developer builds are.
> 2. For profiling pageload, you can generally use Monitor/DDMS . 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  to show what I mean.
> I created some example profiles for startup and pageload. You can download
> them  and open them in Monitor/DDMS using the "File | Open File..." menu.
>  https://bugzilla.mozilla.org/show_bug.cgi?id=947390
>  http://developer.android.com/tools/debugging/debugging-tracing.html
>  http://people.mozilla.org/~mfinkle/fennec/profiles/startup-tracing.patch
>  http://people.mozilla.org/~mfinkle/fennec/profiles
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