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On Thu, Jun 16, 2022 at 03:46:20PM -0500, Bruce Dubbs wrote:
> On 6/16/22 11:39, Ken Moffat ([email protected] via alfs-discuss
> Mailing List) wrote:
> >
> > Summary:
> >
> > Only use -j1 for the SBU if you want to keep a check on things
> > (particularly, to compare the figure from a completed old build to
> > the figure from a completed new build. On a VM I would be dubious
> > about doing that - jhalfs is not set to do that on a completed
> > system, and my gut feeling is that telling a VM to use N cores is
> > not exactly the ame as using N cores on a native machine.
> >
> > If you do want to review the SBU on a completed system, expect some
> > variation on individual runs if there is *anything* else actve (that
> > includes SSDs which might decide to do some 'housekeeping') as well
> > as cron, ssh, other daemons.
>
> Ken, I agree with everything you say, but would like to point out that the
> SBU time for binutils-pass1 is with the host's version of gcc, but packages
> in Chapter 8 are done with the lfs version.
>
Thanks, I had overlooked that point.
> For instance, my SBU time at -j1 on my LFS11.1 system was about 95 seconds
> with gcc11, but with the host using gcc12, the time is now 101 seconds.
>
> If I do not care about timing I build at -j22 on a 24 core system. All of
> jhalfs without the kernel now takes about 26 SBU or roughly 45 minutes.
>
> -- Bruce
Yeah, everything needs more cores these days :)
ĸen
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-- Notting Hill
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