[webkit-dev] Ever increasing binary size

[Elliott Sprehn]

I'd be really interesting to see what patches are causing the growth and by
how much. I wonder how much of this is from some of the fancier template
things we have (ex. the 600 template expansions from StyleBuilder)


On Fri, Mar 22, 2013 at 5:22 AM, Eric Seidel <eric at webkit.org> wrote:

> It seems like it should be trivial to set up an EWS bot to track size
> changes.
>
> It would (sadly) need to clobber, as my understanding is that
> incremental builds are not deterministic in their sizes:
> https://code.google.com/p/chromium/issues/detail?id=110002
> (our bug about this for Chromium Try servers).
>
> Thankfully the EWS is very well suited for this task.
>
> On Fri, Mar 22, 2013 at 1:29 AM, Benjamin Poulain <benjamin at webkit.org>
> wrote:
> > On Fri, Mar 22, 2013 at 12:12 AM, Ryosuke Niwa <rniwa at webkit.org> wrote:
> >>
> >> WebKit nightly build for r135421 dated November 21st, 2012 was 46.1MB.
> >> WebKit nightly build for r145786 dated March 13th, 2013 was 49.4MB.
> >>
> >> Our binary size increased by 7.2% in just 4 months.
> >
> >
> > I have been tracking this issue for a bit. I can send more detailed view
> of
> > the growth if anyone is interested.
> >
> >>
> >> Is this a problem?  I think it is. It means that we use more RAM when
> >> WebKit is loaded onto memory. It means that it takes longer to load
> WebKit
> >> into RAM. It means that auto-update, etc... various browsers that use
> WebKit
> >> needs to send more data over the network.  6MB costs you a ton if you're
> >> wiring over cellar network.
> >
> >
> > RAM space is not the only problem we have with big binaries. The bigger
> our
> > code gets, the less efficiently we use the fast CPU caches and WebKit
> gets
> > slower over time overall.
> >
> > On embedded, you typically have tiny caches and slower memory. This
> leads to
> > a lot of memory pressure and we had to cut binary size sometimes to get
> the
> > performance back.
> >
> >> What strategies can we use to address this problem?
> >
> >
> > I would like it if EWS could report growth and shrinkage somehow, and
> have a
> > warning in case of abnormal growth.
> >
> > Benjamin
> >
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> >
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