From: Nicolas Pitre <nico@cam.org>
Date: Tue, 14 Aug 2007 14:52:35 GMT
Subject: Re: performance on repack
Message-ID: <alpine.LFD.0.999.0708141037020.5415@xanadu.home>
In-Reply-To: <20070814031236.GC27913@spearce.org>

On Mon, 13 Aug 2007, Shawn O. Pearce wrote:

> Jon Smirl <jonsmirl@gmail.com> wrote:
> > This solution was my first thought too. Use the main thread to get
> > everything needed for the object into RAM, then multi-thread the
> > compute bound, in-memory delta search operation. Shared CPU caches
> > might make this very fast.
> 
> I have been thinking about doing this, especially now that the
> default window size is much larger.  I think the default is up as
> high as 50, which means we'd keep that shiny new UltraSPARC T2 busy.
> Not that I have one...  so anyone from Sun is welcome to send me
> one if they want.  ;-)

Note that the default of 50 applies to the maximum delta depth, not the 
delta search window.  And the delta depth limit is costless on the 
packing side.  I, too, wouldn't mind the UltraSPARC T2 though.


Nicolas