[jblack: Re: [tools-discuss] Evaluation notes on bzr-0.7]

[Michael Ellerman]

On Tue, 7 Mar 2006 03:05, Aaron Bentley wrote:
> Michael Ellerman wrote:
> > On 3/6/06, Robey Pointer <robey at lag.net> wrote:
> >>I think if I could start up a little daemon at login that would
> >>automatically track 'bzr edit's for me, I'd probably do it.
> >
> > I think that sounds reasonable, but I think we want to make sure it's
> > a useful optimisation first.
> >
> > I did a quick test the other week and given a hot cache I can stat my
> > entire kernel tree (18,976 files) in somewhere around 0.65 seconds
> > (including python startup). A 'bzr st' takes 11 seconds, so I think
> > there's some fat we can work on before we worry too much about the
> > cost of stat'ing the whole tree.
>
> I agree that we should do our best to trim this fat, but the OpenSolaris
> data showed it was spending 5 seconds in lstat64.  So for their case, I
> think trimming the fat won't be sufficient.

Ouch, how big is their repo? I guess they're running their tests _on_ 
OpenSolaris though, so that's gonna hurt them :)

cheers

-- 
Michael Ellerman
IBM OzLabs

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person
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