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SubjectRe: Parallel build not working since -test6?
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Derek Foreman <manmower@signalmarketing.com> wrote:
> On Fri, 28 Nov 2003, Sam Ravnborg wrote:
>
>> On Thursday 27 November 2003 00:27, Adam Kropelin wrote:
>>> Lately I've noticed my kernel compilations taking longer than usual.
>>> Tonight I finally realized the cause... Parallel building (i.e.
>>> make -jN) is no longer working for me. I traced it back and the
>>> last kernel it worked in was -test5. It ceased working in -test6.
>> It works for me, and for sure it works for most others. Otherwise I
>> would have seen lot of complaints like yours.
>> I recall one similar post, and the person in question used a
>> homegrown script that caused the problems.
>
> Well, this explains why 2.6.x builds so much slower here than it did
> a few kernels ago.
>
> make -j3 improves things. but currently, make -j2 doesn't use both my
> cpus.
>
> no scripts, just make -j2 bzImage

Ah, yes... -j3 gets me 2 cpp/cc pairs as well.

What I see with -j3 is 1 parent make process and two make child processes.
With -j2 I see one parent and one child. Leaving -j off entirely gives the same
as -j2.

-j3:
root 25314 15539 0 Nov27 tty1 00:00:00 make -j3 bzImage
root 25545 25314 0 Nov27 tty1 00:00:00 make -f scripts/Makefile.build obj=arch/i386/kernel
root 25814 25314 0 Nov27 tty1 00:00:00 make -f scripts/Makefile.build obj=kernel


-j2:
root 26391 15539 0 Nov27 tty1 00:00:00 make -j2 bzImage
root 26582 26391 0 Nov27 tty1 00:00:00 make -f scripts/Makefile.build obj=init


--Adam

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