On 6/2/20 2:43 PM, Richard Shaw wrote:
On Tue, Jun 2, 2020 at 6:38 AM Panu Matilainen <pmatilai@xxxxxxxxxx
<mailto:pmatilai@xxxxxxxxxx>> wrote:
On 6/2/20 2:34 PM, Richard Shaw wrote:
> On Tue, Jun 2, 2020 at 5:13 AM Panu Matilainen
<pmatilai@xxxxxxxxxx <mailto:pmatilai@xxxxxxxxxx>
> <mailto:pmatilai@xxxxxxxxxx <mailto:pmatilai@xxxxxxxxxx>>> wrote:
>
>
> Well, it's a guess.
>
> Just tested the particular case of boost-devel install with plain
> rpm on
> all of sqlite, bdb and ndb, and of the three, bdb is the
slowest one.
> The tested, expected behavior of sqlite is as fast or faster
than bdb,
> but of course it's *possible* previously unknown worst-case
> behaviors exist.
>
> Lets start with the basics:
> - is sqlite even involved - it will only be used on rawhide
builds if
> mock bootstrap is used
> - does it make a difference if you override _db_backend to
bdb/sqlite
> from mock config / cli define
> - a reproducer please (eg, what package is considerably
slower to build
> than before, and by how much)
>
>
>
> boost-devel, nosync=True, bootstrap=False
> real 0m6.083s
> user 0m4.232s
> sys 0m1.155s
>
> real 0m6.134s
> user 0m4.356s
> sys 0m1.115s
> ---
>
> boost-devel, nosync=True, bootstrap=True
> real 0m7.464s
> user 0m4.849s
> sys 0m1.364s
>
> I think this one was only slower because it converted the
database? I
> saw a bunch of messages about looking for sqlite but finding bdb
database.
>
> real 0m7.234s
> user 0m4.984s
> sys 0m1.321s
>
> Nope, about the same on a second run.
> ---
>
> boost-devel, nosync=False, bootstrap=False
> real 0m7.017s
> user 0m4.388s
> sys 0m1.144s
> ---
>
> boost-devel, nosync=False, bootstrap=True
> real 1m13.294s
> user 0m6.723s
> sys 0m2.761s
> ---
>
> So it looks like boostrap=True and nosync=False is the culprit,
which I
> inadvertantly got myself into. I did have either set and of course
> nosync would be False by default and it looks like bootstrap=True by
> default for rawhide.
What's the actual command you're running here?
$ mock -r fedora-rawhide-x86_64 --init
$ time mock -r fedora-rawhide-x86_64 --install boost-devel
Ack, thanks.
So this nosync thing is some LD_PRELOAD hack. Is this actually used in
our infra?
- Panu -
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