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Re: PATCH: distcc and ccache speedup: adds directives-only preprocessing

From: Mike Stump <mrs at apple dot com>
To: Ollie Wild <aaw at google dot com>
Cc: gcc-patches at gcc dot gnu dot org, tromey at redhat dot com
Date: Wed, 18 Apr 2007 18:48:30 -0700
Subject: Re: PATCH: distcc and ccache speedup: adds directives-only preprocessing
References: <65dd6fd50702121345x22a46ac8r9d4d218d27301c97@mail.gmail.com> <or64a64z7z.fsf@free.oliva.athome.lsd.ic.unicamp.br> <65dd6fd50702131331q603f5499y9c9e3a89af5368cc@mail.gmail.com> <or3b58vywo.fsf@free.oliva.athome.lsd.ic.unicamp.br> <65dd6fd50702161049t6f34c3f8t6cb7cd0eec9f3cab@mail.gmail.com> <65dd6fd50702271620v499e83c9hd7666830df0b48b3@mail.gmail.com> <65dd6fd50703121326g168fef09l8d4e3b43c507cec2@mail.gmail.com> <65dd6fd50703261531y9256424xefe91d2b6c81f609@mail.gmail.com> <65dd6fd50704172238x2993cb7wc70398f5ac92fff8@mail.gmail.com>

On Apr 17, 2007, at 10:38 PM, Ollie Wild wrote:

This patch decreases distcc build and ccache lookup times by providing
an optimized "directives-only" preprocessing mode.

I did a quick review over the code, looks good. I reviewed it for safety (default behavior) and it looks reasonable. The concept sounds reasonable and could enhance the scaling factor of distcc builds, which makes it desirable for me, as that means a build time speed up. I don't know of any near term technology that can gives a 30% speedup, save new hardware. Personally, I'd like it for 4.2 as well. It looks safe enough to backport.

References:
- Re: PATCH: distcc and ccache speedup: adds directives-only preprocessing
  - From: Ollie Wild

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