Re: speed of git reset -- file

[Jeff King <peff@peff.net>]

On Wed, Jun 01, 2011 at 07:31:57PM -0400, Joey Hess wrote:

> Cold cache:
> [...]
>        28.846625099  seconds time elapsed
> 
> Warm cache is 0.88 seconds, but cold cache is typical; I use a cheap netbook
> for a lot of different stuff.

Yeah, it is going to be painful on a cold cache. But I wonder whether
your workflow would really permit the "reset" thing to make a
difference. That is, are you doing "git reset -- file" from a cold
cache, and then doing _nothing_ else with git? Because while yes, it may
be annoying for the "reset" to take 30 seconds, it's warming the cache
so that the subsequent "diff" or "status" will take 29.1 seconds less.

Which isn't to say I'm not sympathetic to the performance problems of
large repos on a cold cache. But I'm not sure there's really a way
around that. You're going to want to see the stat information eventually
if you are doing anything meaningful with git, and once it's loaded, the
warm cache delay isn't too bad. Trying to avoid it seems like a losing
battle.

-Peff