Re: [battery] Should getBattery() always return the same promise?

On Fri, Jul 4, 2014 at 6:00 PM, Fabrice Desré <fabrice@mozilla.com> wrote:

> On 07/04/2014 12:25 PM, Domenic Denicola wrote:
> > Rick, Chromium has a multi-process architecture, whereas Firefox in
> > general keeps most things in a single process. Thus Firefox has the
> > ability to implement many more things synchronously than Chromium does.
> > Implementation experience based on a single vendor is not terribly
> > valuable in guiding API surface, especially in questions of sync vs.
> > async, and especially when that vendor is Firefox (the only
> > single-process modern browser, from what I understand).
>
> FirefoxOS/b2g is multi-process too, so we care a about not doing undue
> sync IPC. We are doing some for the battery (see
> https://mxr.mozilla.org/mozilla-central/source/hal/sandbox/PHal.ipdl#109).
> I can run some timings if people are interested in knowing how long we
> are blocked in these calls.
>

I went ahead and did some basic timing measurements on both device
(FirefoxOS 1.4 [Fx30], ZTE Open) and desktop (Firefox 30, OSX 10.9.3). I
reviewed the timing method and results with Fabrice to confirm correctness.

https://gist.github.com/rwaldron/850590359d298e35bc61


Rick