Re: [WISH] Store also tag dereferences in packed-refs

From: Marco Costalba <mcostalba@gmail.com>
Date: Nov 19, 2006, 22:25 UTC
Message-ID: <e5bfff550611191425g30d02b98l71cfdc6439d2e09f@mail.gmail.com>
In-Reply-To: <Pine.LNX.4.64.0611191219350.3692@woody.osdl.org>

On 11/19/06, Linus Torvalds <torvalds@osdl.org> wrote:

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> For example, it's often (but not always) faster to do all the readdir's
> separately, and then sort the thing by inode number, and try to avoid
> back-and-forth movement. But quite frankly, that kind of stuff probably
> isn't sane to do in "git show-refs".

Excuse me for my ignorance, but isn' it the job of OS disk schedulers?

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> Anyway, I think that if we really want to make "git show-refs" go fast
> when things are cold in the cache, and with lots ot tags and "-d" (which
> is a reasonable case to optimize for: it's probably exactly what we end up
> doing both for gitweb _and_ for "git-send-pack"), we'd need to expand the
> packed-refs file with the deref cache.
>

Probably also gitk, currently it uses (the slower) "git ls-remote" instead of "git peek-remote" or "git show-refs" but the concept seems the same.