Re: git checkout running very slowly (>12s)

From: Jeff King <peff@peff.net>
Date: Jun 21, 2011, 14:34 UTC
Message-ID: <20110621143437.GB18700@sigill.intra.peff.net>
In-Reply-To: <20110621004452.GA3064@sigill.intra.peff.net>

On Mon, Jun 20, 2011 at 08:44:52PM -0400, Jeff King wrote:

Show 7 quoted lines

> > In other words, it appears that an efficient lstat implementation
> > was not the key factor in this problem.  The root cause remains a
> > mystery, but in my case, the solution was to upgrade Git.
> 
> If you can reliably trigger the problem by switching versions and you
> are still curious and want to spend a little more time on it, you may
> be able to bisect the fix to solve the mystery.

I was curious, and your issue was easy to replicate, so I bisected it myself. The fix was:

  commit e53e6b4433f264250c2e586167caf61721b0185c
  Author: Brian Downing <bdowning@lavos.net>
  Date:   Thu Jun 10 21:59:07 2010 -0500

      unpack-trees: Make index lookahead less pessimal

which went into v1.7.1.1.

-Peff