Markus Stumpf wrote:
> On Thu, Jan 14, 1999 at 07:37:15AM -0000, D. J. Bernstein wrote:
> > Joe Garcia writes:
> > > Is there any place that I can get some performance numbers
> >
> > Certainly: your own machine! Performance depends on many host-specific
> > factors; it's easier to measure than to extrapolate. All you need to
> > know about tuning is in http://pobox.com/~djb/qmail/faq/efficiency.html.
>
> While we're on the topic ;-)
>
> We have a machine (P133, 64 MB RAM, FreeBSD 2.2) acting as a outgoing
> relay.
>
> We have a customer that creates about 12000 different emails in a bulk
> and feeds them to the relay. They arrive at portions of 20 per SMTP
> connection (remote machine is WinNT) and hit a rather empty qmail queue
> (about 50 messages)
>
> For accounting reasons, we use a extra local delivery to a one line awk
> script that simply outputs Message-Id and the second Received: line from
> the header to the maillog (thus causing about 25000 deliveries for one
> bulk).
>
> I recompiled qmail with conf-spawn set to 250 and set local and remote
> concurrency both to 120.
>
> It takes qmail about 1 hour "to get rid" of most mails (few first time
> deliveries fail because of limitations on the remote sites).
>
> However I noticed that when it all starts there are very few
> qmail-remote processes running. Both queues grow ('messages in queue'
> and 'messages in queue but not yet preprocessed') as mails come in
> but there are still only about 5 to 10 qmail-remote processes.
> However, as soon as the 'messages in queue but not yet preprocessed'
> queue is empty the number on qmail-remotes raises drastically and we
> experience a delivery rate of typically 60-90 per 10 seconds.
>
> Is this normal behaviour, did I make a mistake or is there a way to
> increase delivery rates even with a lot of messages in the preprocessing
> queue?
>
> This is normal behavior. Qmailsend starts one message then processes one
incoming message (todo dir). The preprocessing time prevents your machine
from sending messages fast enough to use very many remotes. As soon ad the
preprocessing is done the rate goes up.
>
> Other than that we are more than happy with qmail on our mail hubs and
> pop servers for about 1.5 years now.
>
> Thanks again Dan!
>
> \Maex
>
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