From: Nicolas Pitre <nico@cam.org>
Date: Fri, 21 Apr 2006 03:07:25 GMT
Subject: Re: 1.3.0 creating bigger packs than 1.2.3
Message-ID: <Pine.LNX.4.64.0604202256510.2215@localhost.localdomain>
In-Reply-To: <20060421024012.GA1213@spearce.org>

On Thu, 20 Apr 2006, Shawn Pearce wrote:
> Nicolas Pitre <nico@cam.org> wrote:
> > With the patch above the Linux kernel pack is 0.3% smaller with 1% more 
> > CPU usage.  But like for the diff-delta hash list limiting code this 
> > small overhead is certainly a good compromize to avoid big degradations 
> > in some other cases.
> 
> Hmm.  See the email I just sent. I was seeing a good 10% increase
> in my own tests on a Linux kernel repository.  But I guess I can
> hope that my test was flawed somehow and it really is closer to a 1%
> increase in running time, making it more likely that the above fix
> makes it into GIT.

Well, I repeated the kernel run and this time it took 2.5% more CPU with 
the patch.

But the thing is that I get a +/- 1% difference between successive runs.  
So while the patch does add a certain overhead, it appears to be in the 
same range as noise here.


Nicolas