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How do parallel builds scale?

From: Ludovic Courtès
Subject: How do parallel builds scale?
Date: Thu, 03 Mar 2011 16:42:52 +0100
User-agent: Gnus/5.110013 (No Gnus v0.13) Emacs/23.2 (gnu/linux)


There was recently discussion as to how configure could be parallelized.

I ran a series of build time measurements on a 32-core machine, with
make -jX, with X in [1..32], and the results are available at:

There are also insightful per-package details:

There are packages whose configuration phase is noticeably longer than
the build time.

OTOH, packages with a long build time (with a sequential time in
boldface) don’t scale well either, but that is not configure’s fault.


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