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List:       fedora-devel-list
Subject:    Re: Has something changed with RPMS?
From:       Adam Williamson <adamwill () fedoraproject ! org>
Date:       2020-06-03 6:27:10
Message-ID: 755b5ca245c58a64e701332a4de2b5c5da39c474.camel () fedoraproject ! org
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On Wed, 2020-06-03 at 09:06 +0300, Panu Matilainen wrote:
> On 6/2/20 7:25 PM, Adam Williamson wrote:
> > On Tue, 2020-06-02 at 11:05 -0500, Richard Shaw wrote:
> > > On Tue, Jun 2, 2020 at 10:25 AM Adam Williamson <adamwill@fedoraproject.org>
> > > wrote:
> > > 
> > > > On Tue, 2020-06-02 at 06:34 -0500, Richard Shaw wrote:
> > > > > 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.
> > > > 
> > > > When you say 'bootstrap', which setting do you mean exactly? I don't
> > > > see one that's just called 'bootstrap', I see --(no-)bootstrap-chroot
> > > > and --(no-|use-)bootstrap-image .
> > > > 
> > > 
> > > $ cat .config/mock.cfg
> > > config_opts['cleanup_on_failure'] = False
> > > config_opts['nosync'] = True
> > > config_opts['use_bootstrap'] = False
> > > 
> > > I got this from the documentation, maybe should have searched a bit more,
> > > didn't think there was more than one bootstrap option.
> > 
> > That seems to be the same as --bootstrap-chroot , i.e. --no-bootstrap-
> > chroot should set it False.
> > 
> > So, if I explicitly set nosync = True in mock.cfg it goes back to being
> > as fast as I remember. But that's somewhat odd, because:
> > 
> > a) I definitely didn't have explicit config to turn nosync on before
> > b) I didn't actually have the nosync packages installed at all until
> > after I hit this problem
> > 
> > so it seems like somehow before I was getting fast performance without
> > using nosync, but now I need it? Weird...
> 
> Okay, that's useful. I'm not at all familiar with how this all actually 
> works in mock but I see that nosync.so is being copied around etc, and 
> with bootstrap introducing an extra layer in between, it's not hard to 
> imagine a subtle bug or two in there. Just a guess though.

The thing is, I'm really pretty sure I *wasn't using* mock's nosync
support before. I don't see how I could have been, since I didn't have
nosync installed. So this still seems kinda mysterious. Either somehow
it wasn't fsync'ing before but it is now, or somehow disk writing
performance on my system fell off a cliff?

I'll try and poke it some more tomorrow if I can, try some old kernels
and/or old mock builds or something.
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net
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