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

[Howard Chu]

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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