Re: [PATCH 2/5] builtin/repo: collect largest inflated objects

[Junio C Hamano <gitster@pobox.com>]

Justin Tobler <jltobler@gmail.com> writes:

> The "structure" output for git-repo(1) shows the total inflated and disk
> sizes of reachable objects in the repository, but doesn't show the size
> of the largest individual objects. Since an individual object may be a
> large contributor to the overall repository size, it is useful for users
> to know the maximum size of individual objects.

Hmph.  It is true that a byte is worth the same amount of money no
matter what object it is used to represent, but comparing the size
of a commit object and the size of a blob object feels inherently
meaningless to me.

It all depends on what you are trying to learn out of the stats, but
having many small blob objects that add up to 1GB and having medium
number of medium sized tree objects that adds up to the same 1GB
would give the same number in object_stats.inflated_sizes for both
types, indicating that they are costing you about the same.  But the
members in largest_objects for these types would be different,
hinting (incorrectly) that one type may be costing more than the
other.  Would that really tell us something useful, I have to
wonder?

One thing that is related to "largest" that might be useful is how
spiky size distribution is.  Among many medium sized blobs, if there
is only a handful of super huge blobs, that is quite a notable thing
to know (as opposed to the case where these super huge blobs are
not so unusual).