Re: Changing Default News Server

[Jan Vroonhof <vroonhof@math.ethz.ch>]

Jan Vroonhof <vroonhof@math.ethz.ch> writes:

> 2. Almost all are read and those that are unread are at the end
> (i.e. you have used Catchup).
> 
> Case 2 is the difficult one:
> 
> Then consider say the last 100 messages of the large "read" block and
> look them up on the new server. Lookup the unread articles on the new
> server. Take the minum of the article numbers found This gives you a
> reasonble lower bound for the unread articles.
> Then proceed lower bound upwards to lookup which of the remaing
> articles you have read.
> 
> This at least gives you a reasonble approximation of wat you want.
> 
> Whether this is implementable in e-lisp is another matter.

A trivial prototype perl program showed that perl can read in 35000
Messaged-ID,article number pairs from an xover file in an  hash table
and look them all up again in under two minutes.

-- 
Jan Vroonhof                    http://www.math.ethz.ch/~vroonhof/
Mathematik,                                  vroonhof@math.ethz.ch
HG E16, ETH-Zentrum,                      Tel: +41-1-6325456/25154
Raemistrasse 101, CH-8092 Zuerich.              Fax: +41-1-6321085