Jordan Hubbard wrote:
>
> > One other point that I would like to understand is why -j4 takes
> > longer on all of my systems. That goes against what everyone claims
> > should happen.
>
> With how many running processors? If you're running -j4 on a
> uniprocessor system, you're only introducing competition for already
> scarce CPU resources, though -j2 can be a speedup since this allows
> one target build to run while another is in an I/O wait. I've only
> seen a speedup with -j4 when using at least 2 CPUs.
It was a uniprocessor system. The folklore has it doing more but all I
ever saw it produce was more competition, which resulted in a longer
running buildworld.
Kent
--
Kent Stewart
Richland, WA
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