parallel builds revisited
LoN_Kamikaze at gmx.de
Thu Apr 12 19:48:10 UTC 2007
Benjamin Lutz wrote:
> On Thursday 12 April 2007 11:06, Garrett Cooper wrote:
>> I dunno how you want to approach this, but gmake does recommend 2
>> jobs be run in parallel for HTT enabled chips, and 3 or 4 jobs for a
>> dual core machines.
> So far the approach is one job per CPU. I'll do some benchmarks lateron
> to determine wether it really helps to run more jobs. For the KDE
> ports, my gut feeling is that the improvement would be negligible. I'll
> have to evaluate non-C++ ports like gnome-*, where the compilation time
> per file is shorter.
I find the benefit especially big with Gecko based ports like Firefox or
> Of course, to make proper use of distcc, at least #cores + 1 jobs are
> required. I'll keep that in mind.
The recommendation of the Distcc developers is 2 jobs per core, as long as
the machines contain sufficient memory.
My personal experience says that it's rarely possible to divide a Makefile
into more than 6 threads.
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