I ran "git cat-file commit some-tag" for every tag. They seem to be
roughly uniformly distributed between 0s and 2s and about 2/3 of the
time seems to be system. My disk is mounted over NFS so I tried on the
local disk and it didn't make a difference.

I have only one 1.97GB pack. I ran "git gc --aggressive" before.

On Thu, Nov 8, 2012 at 4:11 PM, Jeff King <p...@peff.net> wrote:
> On Thu, Nov 08, 2012 at 03:49:32PM -0600, Uri Moszkowicz wrote:
>> I'm using RHEL4. Looks like perf is only available with RHEL6.
> Yeah, RHEL4 is pretty ancient; I think it predates the invention of
> "perf".
>> heads: 308
>> tags: 9614
>> Looking up the tags that way took a very long time by the way. "git
>> tag | wc -l" was much quicker. I've already pruned a lot of tags to
>> get to this number as well. The original repository had ~37k tags
>> since we used to tag every commit with CVS.
> Hmm. I think for-each-ref will actually open the tag objects, but "git
> tag" will not. That would imply that reading the refs is fast, but
> opening objects is slow. I wonder why.
> How many packs do you have in .git/objects/pack of the repository?
>> All my tags are packed so cat-file doesn't work:
>> fatal: git cat-file refs/tags/some-tag: bad file
> The packing shouldn't matter. The point of the command is to look up the
> refs/tags/some-tag ref (in packed-refs or in the filesystem), and then
> open and write the pointed-to object to stdout. If that is not working,
> then there is something seriously wrong going on.
> -Peff
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