On Sat, 17 Mar 2007, Linus Torvalds wrote:

quoted text
> 
> 
> On Sat, 17 Mar 2007, Morten Welinder wrote:
> >
> > >         samples  %        app name                 symbol name
> > >         41527    15.6550  git                      strlen
> > 
> > Almost 16% in strlen?  Ugh!
> > 
> > That's a lot of strings, or perhaps very long strings.  Or a profiling bug.
> 
> It's likely real, and the problem is likely lots of small strings.
> 
> Each git tree entry is:
> 
> 	"<octal mode> name__PLACEHOLDER__0_" <20-byte sha1>
> 
> so you do have a *lot* of strlen() calls when doing any tree parsing.

This is definitely an area where pack v4 will bring that cost down to 
zero.


Nicolas
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