Re: UP 2.2.18 makes kernels 3% faster than UP 2.4.0-test12

Mike Galbraith
2000-12-12T05:51:16Z

On Mon, 11 Dec 2000, Steven Cole wrote:

> On Mon, 11 Dec 2000, Mike Galbraith wrote:
> > On Mon, 11 Dec 2000, Steven Cole wrote:
> > > I have a SMP (dual P-III 733Mhz) machine at work, but it will be
> > > unavailable for testing for a few more days. I suspect that 2.4.0-test12
> > > will do better than 2.2.18 with 2 CPUs. I'll know in a few days.
> [snip]
> >
> > I think it's better with -j. Do it with -jN where N is small enough
> > to keep the box away from swap, and then repeat with N large enough to
> > swap modestly (not too heavily or you're only testing disk MTBF:).
>
> I've always used make -j2 bzImage for my two processor machine.
> I like being able to build kernels in a little over two minutes.
>
> Simple question here, and risking displaying great ignorance:
> Does it make sense to use make -jN where N is much greater than the
> number of CPUs?

If you're testing VM, definitely yes. Otherwise.. _not_ ;-)

-Mike