From: Christian Weisgerber <naddy@mips.inka.de>
Subject: Re: Optimized branch switching?
To: gameoftrees@openbsd.org
Date: Mon, 12 Sep 2022 22:45:05 +0200

Stefan Sperling:

> > > $ time got up -b master
> > > Switching work tree from refs/heads/local to refs/heads/master
> > > Already up-to-date
> > >     0m21.18s real     0m04.48s user     0m09.00s system
> > 
> > Try measuring again with 'got branch -n'.
> > I suspect the time is spent by the equivalent of 'got update', since
> > 'got branch' implicitly updates the work tree.

Uh, it's about "update -b" not any "branch" command.  But sure:

$ time got branch -n foo
    0m00.11s real     0m00.03s user     0m00.05s system

> Just checking on a local machine here, a no-op update of /usr/ports
> is much faster:

Not here:

$ time got up 
Already up-to-date
    0m22.21s real     0m04.38s user     0m09.26s system

It's a slow machine (APU2).
So you're right, it's just the "got update" time.

> Could you re-pack your repository and try again?

$ gotadmin info                                         
repository: /home/naddy/ports.git
pack files: 5
packed objects: 1750917
packed total size: 508M
loose objects: 11
loose total size: 54.2K

That doesn't actually look bad.  But sure, one "git gc" later:

$ gotadmin info
repository: /home/naddy/ports.git
pack files: 1
packed objects: 1750064
packed total size: 502M
loose objects: 1
loose total size: 1.8K

$ time got up
Already up-to-date
    0m23.35s real     0m05.33s user     0m09.69s system

Yeah, that didn't make a difference.

Looks like "got update" scales with the speed of the underlying
hardware, which isn't that surprising. :-)

-- 
Christian "naddy" Weisgerber                          naddy@mips.inka.de