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

Pau Garcia i Quiles pgquiles at elpauer.org
Wed Mar 27 12:40:19 PDT 2013


This thread already contains about 30 speculative messages. What about
providing a patch for the whole WebKit and some benchmarks on the main
platforms and compilers?

On Tue, Mar 26, 2013 at 7:21 PM, Daniel Bratell <bratell at opera.com> wrote:

> Hi WebKittens,
> As you might be aware, we at Opera now have Chromium based products which
> means that we compile WebKit quite a lot. A big issue for us and our
> automatic systems has been the long time needed to compile WebKit (inside
> Chromium), especially in Windows.
> The big compilation time difference between Linux and Windows didn't seem
> to make sense so we did some analysis of what was going on and we think
> that we have found a cause. In WebKit include directives are without path,
> and instead the compiler is given a very long list of directories to search
> through. That process takes a lot of time in Windows. It must take some
> time in OSX and in Linux too but probably less.
> 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.
> There is no reason to think the same reduction doesn't apply to all
> projects and then there are many many minutes to save for developers and
> build servers here.
> Caveat: I don't know if the resulting binary is correct.
> Is this something that has been talked about in the past, and would you be
> interested in replacing the long list of directories to search for every
> include with paths (relative some good base) directly in the include
> directives?
> /Daniel
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Pau Garcia i Quiles
(Due to my workload, I may need 10 days to answer)
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