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Re: [PATCH 1/2] commit-graph write: add progress output

On Fri, Sep 07, 2018 at 05:23:31PM +0200, Ævar Arnfjörð Bjarmason wrote:

> Hrm, no. I spoke too soon because I was conflating "commit-graph write"
> v.s. "gc". For "gc" we're now with this change just e.g. spending 6
> seconds on 2015-04-03-1M-git displaying nothing, because we're looping
> through the commits and finding that we have no new work.
> So I'm on the fence about this, but leaning towards just taking my
> initial approch. I.e. it sucks if you're e.g. testing different "git gc"
> options that we're churning in the background doing nothing, just
> because we're trying to report how many *new* things we added to the
> graph.
> After all, the main point IMNSHO is not to show some diagnostic output
> of exactly how much work we're doing, that I have 200 new commits with
> generation numbers or whatever is just useless trivia, but rather to not
> leave the user thinking the command is hanging.

I think there's some precedent for your view of things, too. For
example, "writing objects" counts _all_ of the objects, even though many
of them are just copying bytes straight from disk, and some are actually
generating a delta and/or zlib-deflating content.

So it's not the most precise measurement we could give, but it shows
there's activity, and the "average" movement over many objects tends to
be reasonably smooth.

> So I think I'll just do what I was doing to begin with and change the
> message to "Refreshing commit graph generation numbers" or something to
> indicate that it's a find/verify/compute operation, not just a compute
> operation.

So basically yes, I agree with this. :)