Why is compiling WebKit so slow?

[pdknsk]

This may be an odd question. When compiling Chromium on a 32 vCPU GCE instance it zips through the first ~19000 files quickly (with a minor slowdown on V8), but slows down significantly when it gets to WebKit. The counter for those ~3000 files increases only slowly. Thats true for both gcc (Android) and clang (Linux). Is that expected or a bug?

[Nico Weber]

This has been discussed before; if you search for "chromium-dev blink slow bratell" you'll probably find the old thread.

On Oct 29, 2016 5:58 PM, "pdknsk" <pdk...@gmail.com> wrote:

This may be an odd question. When compiling Chromium on a 32 vCPU GCE instance it zips through the first ~19000 files quickly (with a minor slowdown on V8), but slows down significantly when it gets to WebKit. The counter for those ~3000 files increases only slowly. Thats true for both gcc (Android) and clang (Linux). Is that expected or a bug?

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[pdknsk]

Thanks, got it.

https://groups.google.com/a/chromium.org/d/msg/chromium-dev/ebnkCESeTK4/i-4j2Js7AgAJ

[Peter Kasting]

+CC bratell

Daniel, did you take another shot at the PCH patch now that we've been on MSVC 2015 for awhile?

PK

On Sat, Oct 29, 2016 at 3:18 PM, pdknsk <pdk...@gmail.com> wrote:

Thanks, got it.

https://groups.google.com/a/chromium.org/d/msg/chromium-dev/ebnkCESeTK4/i-4j2Js7AgAJ

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[pdknsk]

I assume this is old news to most here, but I want to mention this was solved through jumbo builds, which accelerates building WebKit significantly. It's really slow without it, in comparison. It has been getting worse since too.

https://cs.chromium.org/chromium/src/build/config/jumbo.gni?l=11