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Re: Fast access git-rev-list output: some OS knowledge required

From
Johannes Schindelin <johannes.schindelin@gmx.de>
Date
Dec 6, 2006, 23:27 UTC
Message-ID
<Pine.LNX.4.63.0612070025450.28348@wbgn013.biozentrum.uni-wuerzburg.de>
In-Reply-To
<20061206192800.GC20320@spearce.org>
Hi,
On Wed, 6 Dec 2006, Shawn Pearce wrote:
Show 10 quoted lines
> Marco Costalba <mcostalba@gmail.com> wrote:
> > The time it takes to read, without processing, the whole Linux tree
> > with this approach it's almost _double_ of the time it takes 'git
> > rev-list' to write to a file:
> > 
> > 3) Other suggestions?  ;-)
> 
> The revision listing machinery is fairly well isolated behind some 
> pretty clean APIs in Git.  Why not link qgit against libgit.a and just 
> do the revision listing in process?

Because, depending on what you do, the revision machinery is not reentrable. For example, if you filter by filename, the history is rewritten in-memory to simulate a history where just that filename was tracked, and nothing else. These changes are not cleaned up after calling the internal revision machinery.

Hth, Dscho

Previous: Marco CostalbaNext: Linus Torvalds
Message 15 of 17 in “Fast access git-rev-list output: some OS knowledge required”
  1. Marco CostalbaDec 6, 2006
  2. Shawn PearceDec 6, 2006
  3. Marco CostalbaDec 6, 2006
  4. Shawn PearceDec 6, 2006
  5. Shawn PearceDec 6, 2006
  6. Marco CostalbaDec 6, 2006
  7. Shawn PearceDec 6, 2006
  8. Andreas EricssonDec 7, 2006
  9. Johannes SchindelinDec 7, 2006
  10. Andreas EricssonDec 7, 2006
  11. Johannes SchindelinDec 7, 2006
  12. Marco CostalbaDec 8, 2006
  13. Michael K. EdwardsDec 8, 2006
  14. Marco CostalbaDec 9, 2006
  15. Johannes SchindelinDec 6, 2006
  16. Linus TorvaldsDec 7, 2006
  17. Marco CostalbaDec 7, 2006

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