Re: These new diffs are great, but...
On Fri, Jun 30, 2006 at 06:29:40PM +0200, Florian Weimer <fw@deneb.enyo.de> wrote:
> * Marc Haber:
>
> > The machine in Question is a P3 with 1200 MHz. What's making the
> > process slow is the turnaround time for the http requests, as observed
> > multiple times in this thread alone.
>
> Then your setup is very broken. APT performs HTTP pipelining.
>
> On my machines, I see the behavior Miles described: lots of disk I/O.
> Obviously, APT reconstructs every intermediate version of the packages
> file.
>
> The fix is to combine the diffs before applying them, so that you only
> need one process the large Packages file once. I happen to have ML
> code which does this (including the conversion to a patch
> representation which is more amenable to this kind of optimization)
> and would be willing to port it to C++, but someone else would need to
> deal with the APT integration because I'm not familiar with its
> architecture.
You're looking for combinediff in the patchutils package.
Mike
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