Ian Collins wrote:
As I've suggested before, the best way I can see to improve build times
is to "flatten out" the build. One way to do this is to create higher
level makefiles with targets from several directories. This reduces the
number of bottlenecks.
This is how I structure my own code and I can maintain a steady number
of jobs over several build machines this way.
This will also help to bring distributed building to ON.
As Stephen Hahn has already pointed out I did a significant amount of
work in this area in the past. I too incorrectly assumed that the thing
slowing down builds was lack of parallelism in the makefiles, and I was
wrong as well. The actual cause was unnecessary /bin/sh invocations
which were chewing up vast amounts of CPU, and I suspect that there is
still work to be done in that area. This was directly contrary to my
expectations when I started the work, I thought the problems would be
primarily related to poor parallelism in the build.
Please read the paper.
http://mediacast.sun.com/share/sch/d-exacct-builds-suntech-2001.pdf
Moral of the story: Instrument and measure before suggesting solutions,
otherwise you are probably fixing the wrong thing.
--
Alan Burlison
--
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