On Fri, Sep 27, 2024 at 09:39:07AM +0200, Christian Schulte wrote:
> On 9/26/24 10:43, Stuart Henderson wrote:
> > On 2024-09-26, Christian Schulte <cs@schulte.it> wrote:
> >> I am keen on knowing how those snapshots are build. Do they really wipe
> >> out everything and then do a fresh build - lasting nearly 24h here for
> >> me. I doubt it.
> >
> > That's how I do base+x "make build" and "make release" when I do them.
> >
> > 24h is a long time. Are you using very slow machines or did you just not
> > use -j?
> >
>
> time doas make build
>
> chown root:wheel /tmp/_etcdir.ajLXZ6LHx1/var/sysmerge/etc.tgz
> chmod 644 /tmp/_etcdir.ajLXZ6LHx1/var/sysmerge/etc.tgz
> 45014.21 real 32976.78 user 10507.23 sys
>
> Nearly 13h. Seems the host the guest is running on currently has I/O issues. A
> linux guest on the same host also currently has issues. Lots of log messages
> like these.
>
> kernel:[ 460.053622] watchdog: BUG: soft lockup - CPU#5 stuck for 75s! [kworker/5:0:42]
>
> Linux needs a reboot after those messages, OpenBSD just successfully ran a
> make build.
>
> make -j does not make a lot of a difference. The disk I/O currently is just
> very slow. Has nothing to do with OpenBSD.
>
> OpenBSD 7.6-current (GENERIC.MP) #12: Thu Sep 26 20:25:45 CEST 2024
> schulte@0x02.schulte.it:/sys/arch/amd64/compile/GENERIC.MP
> real mem = 6425518080 (6127MB)
> avail mem = 6207578112 (5920MB)
> random: good seed from bootblocks
> mpath0 at root
> scsibus0 at mpath0: 256 targets
> mainbus0 at root
> bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xf5a10 (10 entries)
> bios0: vendor SeaBIOS version "rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org" date 04/01/2014
> bios0: QEMU Standard PC (i440FX + PIIX, 1996)
^^^^^^^^^^^^^^^^
You can't expect the build time in a QEMU guest to compare with the one
from a "bare metal" machine. Of course it its slower. And I guess the
I/O performance will be highly dependent on whatever else the QEMU host
is running, and on how it prioritizes things.
--
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