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List:       fedora-devel-list
Subject:    Re: Has something changed with RPMS?
From:       Panu Matilainen <pmatilai () redhat ! com>
Date:       2020-06-02 11:38:42
Message-ID: b9525b9c-2c33-e2db-381f-d7f2acc02d3d () redhat ! com
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On 6/2/20 2:34 PM, Richard Shaw wrote:
> On Tue, Jun 2, 2020 at 5:13 AM Panu Matilainen <pmatilai@redhat.com 
> <mailto:pmatilai@redhat.com>> 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?

	- Panu

> 
> I guess the next question is, why is that an order of magnitude worse of 
> a combination?
> 
> Thanks,
> Richard
> 
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