On Tue, Jun 2, 2020 at 5:13 AM Panu Matilainen <pmati...@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. I guess the next question is, why is that an order of magnitude worse of a combination? Thanks, Richard
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