History File over 2GB

[Jeffrey M. Vinocur]

On Tue, 3 Sep 2002, Russ Allbery wrote:

> bill davidsen <davidsen at tmr.com> writes:
> > Russ Allbery  <rra at stanford.edu> wrote:
> 
> > | If you set nnrpdcheckart to true in inn.conf, nnrpd will verify the
> > | existence of the articles at the time of LISTGROUP or XOVER and only
> > | send lines for those articles that are actually present in the spool.
> 
> > What does that do to performance?
> 
> Depends on your storage backend, but it can cause some minor delays
> (particularly for very large groups).

Actually, I don't think minor describes it accurately.  I've seen large 
groups (tens of thousands of articles) stored in tradspool on a single 
disk take several minutes to do xover, and it appears to be related to 
this.

I suspect there's something else going on here, because it has all of the 
delay at once and then sends all of the data, which doesn't match my 
mental model of what should happen (send response header, and then send 
multiline response one article at a time as they are discovered).  But 
there's definitely a potential downside to checkart as things stand now.


-- 
Jeffrey M. Vinocur
jeff at litech.org