Re: serious performance issues with images, audio files, and other "non-code" data

From: Jeff King <peff@peff.net>
Date: May 18, 2010, 19:41 UTC
Message-ID: <20100518194105.GA4723@coredump.intra.peff.net>
In-Reply-To: <alpine.LFD.2.00.1005181528550.12758@xanadu.home>

On Tue, May 18, 2010 at 03:33:58PM -0400, Nicolas Pitre wrote:

Show 5 quoted lines

> > It will have to write the whole 200M packfile out each time, though.
> 
> No.  gc will only create a pack with new loose objects by default.  
> Only if the number of packs grow too large will it combine them into one 
> pack.

I think that is only "gc --auto". With regular gc:

  $ git init
  $ echo content >file && git add file && git commit -m one
  $ git gc
  Counting objects: 3, done.
  Writing objects: 100% (3/3), done.
  Total 3 (delta 0), reused 0 (delta 0)
  $ du -a .git/objects/pack
  4  .git/objects/pack/pack-5f6fe4b14529d73f51d7c8efa69306edd35f2302.idx
  4  .git/objects/pack/pack-5f6fe4b14529d73f51d7c8efa69306edd35f2302.pack
  12 .git/objects/pack

  $ echo content >>file && git commit -a -m two
  $ git gc
  Counting objects: 6, done.
  Delta compression using up to 2 threads.
  Compressing objects: 100% (2/2), done.
  Writing objects: 100% (6/6), done.
  Total 6 (delta 0), reused 3 (delta 0)
  $ du -a .git/objects/pack
  4  .git/objects/pack/pack-ecf41a1c120eb911f50fdd2c159e94d5832974f7.idx
  4  .git/objects/pack/pack-ecf41a1c120eb911f50fdd2c159e94d5832974f7.pack
  12 .git/objects/pack

So six objects written in the second gc, and obviously a brand new single pack.

-Peff