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Re: [RFC PATCH] We should add a "git gc --auto" after "git clone" due to commit graph

On 10/5/2018 3:47 PM, Jeff King wrote:
On Fri, Oct 05, 2018 at 03:41:40PM -0400, Derrick Stolee wrote:

So can we really just take (total_objects - commit_graph_objects) and
compare it to some threshold?
The commit-graph only stores the number of _commits_, not total objects.
Oh, right, of course. That does throw a monkey wrench in that line of
thought. ;)

There's unfortunately not a fast way of doing that. One option would be
to keep a counter of "ungraphed commit objects", and have callers update
it. Anybody admitting a pack via index-pack or unpack-objects can easily
get this information. Commands like fast-import can do likewise, and
"git commit" obviously increments it by one.

I'm not excited about adding a new global on-disk data structure (and
the accompanying lock).

If we want, then we can add an optional chunk to the commit-graph file that stores the object count.