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[bug #28134] inconsistent reporting of linux kernel builds with -j2

From: Howard Chu
Subject: [bug #28134] inconsistent reporting of linux kernel builds with -j2
Date: Fri, 15 Jan 2010 06:29:31 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.9.3a1pre) Gecko/20091218 SeaMonkey/2.0a1pre Firefox/3.0.3

Follow-up Comment #3, bug #28134 (project make):

As a complete digression, and based on 26 years of doing parallel builds
(damn it's been a long time), I just wanted to point out that you can
generally use 50% more jobs than your number of CPUs/cores. E.g., for a
dual-core machine, use make -j3. Compilation tends to be heavily I/O bound; if
you only use as many jobs as you have cores, you will tend to always have at
least 30% idle CPU. Bump up the jobs by 50% and you can utilize that extra CPU
without overloading the machine. Go beyond that and you tend to lose.


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