[Mailman-Users] sending email step
rullfig at uchicago.edu
Mon Mar 6 19:20:25 CET 2000
Paul Tomblin wrote:
> Quoting Roberto Ullfig (rullfig at uchicago.edu):
> > How does mailman actually send the messages to the users on a
> > list? Does it call sendmail in parallel or serial? Is there a
> > pause between each message getting sent or does it try to use
> > all of a system's resources? We think that some large lists are
> > bringing our system down to its knees.
> You can configure how many sendmail processes it spawns per message, and it
> makes those connections in parallel. However, each sendmail process will
> process its list serially. If you find large lists are bogging your system
> down in terms of flooding the network, you might want to make it fewer
> connections so that it only works on one destination per message at a time.
> However, if it's a CPU thing, you might want to look into raising or lowering
> that number, OR you might want to look into a different MTA. I switched to
> postfix and it's tons faster than sendmail. I've heard good things about exim
> and qmail - although the author of qmail is a prick and you don't want to deal
> with him if you can avoid it.
I assume you're talking about the mailman num_spawns variable
then? (default is 5) - should we lower this for very large lists
then? Can this be configured for all lists? Is there a global
Our problem was with running out of memory, does postfix use
less memory than sendmail? Postfix would not make anything
noticeably faster for us; phquery is our bottleneck.
Thanks in advance!
Roberto Ullfig : rullfig at uchicago.edu
Networking Services and Information Technologies
University of Chicago
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