On Mon, 31 Oct 2016 18:06:07 -0400,
Alan McKinnon wrote:
>
> On 31/10/2016 23:57, John Covici wrote:
> > On Mon, 31 Oct 2016 13:37:50 -0400,
> > [email protected] wrote:
> >>
> >> Dale <[email protected]> [16-10-31 18:36]:
> >>> [email protected] wrote:
> >>>> Hi,
> >>>>
> >>>> from ancient times ;) I remember, that it is not advisable
> >>>> to compile a linux kernel with more than one cpu core.
> >>>>
> >>>> Is that still true, or is it save to compile it with
> >>>> "all you can eat" ::)) ?
> >>>>
> >>>> Cheers
> >>>> Meino
> >>>>
> >>>>
> >>>
> >>> While I don't upgrade my kernel very often, since I don't reboot often
> >>> either, I've used -j 6 for my 4 core CPU for a long time. I'm pretty
> >>> sure I've done that ever since I built this rig. So far, no problems
> >>> that I have seen.
> >>>
> >>> Dale
> >>>
> >>> :-) :-)
> >>>
> >>
> >> Great! Currently rebuilding the kernel with '-j7 ' :)
> >
> > I wonder, how does it make sure that a dependency is always compiled
> > before what depends on it, so the link and all that works?
> >
>
> The kernel is special - it's a completely self-contained body of code
> with no external dependencies, so it is internally consistency almost as
> a matter of course.
>
> As for compiling the right things in the right order, the Makefiles take
> care of that just like all other software with a build system. How does
> the Makefile get made? Well, when you do make <something>config, you see
> all those deps like how iwlwifi depends on 80211 which depends on
> networking etc. That tells you the order things must be built in. Shove
> that into a Makefile maker, and voila, Bob's your auntie. Build issues
> tends to get fixed during the dev period so when Linux releases a kernel
> there's an excellent chance it will build correctly.
>
> FWIW, none of this is a specially difficult problem. It's the kind of
> thing I'd expect bright CS students to be able to do at the end of the
> first year
OK, I will maybe try something, but I have had gentoo problems only
solved by -j1 due to such things, I guess.
--
Your life is like a penny. You're going to lose it. The question is:
How do
you spend it?
John Covici
[email protected]
