Re: Why is "git tag --contains" so slow?

From: Nicolas Pitre <nico@fluxnic.net>
Date: Jul 8, 2010, 23:15 UTC
Message-ID: <alpine.LFD.2.00.1007081910480.6020@xanadu.home>
In-Reply-To: <201007082320.05017.jnareb@gmail.com>

On Thu, 8 Jul 2010, Jakub Narebski wrote:

Show 5 quoted lines

> If I remember correctly with pack v4 some operations like getting size
> of tree object needs encoding to current format, so they are slower than
> they should be (and perhaps a bit slower than current implementation).
> But that should be I think rare (well, unless one streams to 
> 'git cat-file --batch / --batch-check').

I didn't write the code to recreate canonical object format yet, but I suspect that the pack v4 object encoding will have to carry the size for the canonical version.

> Would pack v4 need index v4?

So far, no.

> By the way, rev-cache project was started mainly to make "counting
> objects" part of clone / fetch faster.  Would pack v4 offer the same
> without rev-cache?

That's indeed the main goal.

Nicolas