Re: Performance issue of 'git branch'

[Jakub Narebski <jnareb@gmail.com>]

Linus Torvalds <torvalds@linux-foundation.org> writes:

> On Thu, 23 Jul 2009, Carlos R. Mafra wrote:
> > 
> > Is there another way to check what is going on with that anomalous lstat()?
> 
> I really don't think it's the lstat any more. Your directories look small 
> and simple, and clearly the indexing made no difference.
> 
> See earlier email about using "strace -T" instead of "-tt". Also, I sent 
> you a patch to try out just a minute ago, I think that may be it.
> 
> > [ perhaps I will try 'perf' after I read how to use it ]
> 
> I really like 'perf' (it does what oprofile did for me, but without the 
> headaches), but it doesn't help with IO profiling.
> 
> I've actually often wanted to have a 'strace' that shows page faults as 
> special system calls, but it's sadly nontrivial ;(

BTW. Would SystemTap help there?  Among contributed scripts there is
iotimes, so perhaps it would be possible to have iotrace...

-- 
Jakub Narebski
Poland
ShadeHawk on #git