Re: Performance issue of 'git branch'

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On Wed, 22 Jul 2009, Linus Torvalds wrote:
> It uses the "raw" version of 'for_each_ref()' (which doesn't verify that 
> the ref is valid), and then does the "type verification" before it starts 
> doing any gentle commit lookup.

I submitted essentially the same patch in May:
  http://article.gmane.org/gmane.comp.version-control.git/120097
with the additional optimization that we don’t need to lookup commits at 
all unless we’re using -v, --merged, --no-merged, or --contains.  In my 
tests, it makes `git branch` 5 times faster on an uncached linux-2.6 
repository.

Anders
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