[webkit-dev] Compiling WebKit up to 25% faster in Windows?

[Nico Weber]

On Wed, Mar 27, 2013 at 12:05 PM, Brent Fulgham <bfulgham at gmail.com> wrote:

> Hi Daniel,
>
> On Tue, Mar 26, 2013 at 11:21 AM, Daniel Bratell <bratell at opera.com>wrote:
>
>> As an experiment we took the (chromium) project webcore_dom, that
>> normally compiles in 56 seconds in Windows on a generic computer and
>> "fixed" it. Removing the many include paths in the build system and instead
>> specifying the path in the include directives changed that to 42 seconds, a
>> 25% reduction.
>>
>
> I thought that much of this was supposed to be addressed by the use of
> precompiled headers.  Presumably, if the header files are properly
> incorporated into the PCH, shouldn't any gains from relative paths be
> small? Obviously your statistic says otherwise, but I'm not sure that a
> single test on a single system is definitive proof of anything.
>

I thought PCHs are mostly for system headers that don't change often (
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/WebCore/WebCorePrefix.h&q=WebCorePrefix&sq=package:chromium&type=cs),
else every .h change would require recompiling _all_ cc files, no?


>
> Did you run the test multiple times to get a feel for how reproducible the
> improvements was? I know I have fooled myself in the past into thinking I
> had improved something, only to discover that unrelated computer activity
> (e.g., backups, virus scans, etc.) were contributing to slow build times.
>
> -Brent
>
>
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