2. Using a dual xeon 1.8 server with 2GB of ram I still have the problem that the web interface is not responding when sending out a message. Looking at the cpu and memory stats it seems mailman grabs all resources and leaves the web interface unusable. This has gotten so bad that people complained that they cannot unsubscribe after receiving the message.
This is a known performance issue with some large lists. I don't know what kind of disk subsystem you have, but if you can use a RAID 0+1 array with high-speed disks on an intelligent hardware controller with battery-backed write-back cache, and you enable certain filesystem features (depending on your OS), this may help significantly improve your performance.
In my experience, most performance problems with large mailing lists and large mail systems come down to inadequate disk I/O capacity (operations per second, not read or write throughput), and doing this kind of thing is the best/most reliable way to get the kind of performance you're likely to need. You don't need CPU for this. Once you get a certain amount of RAM, adding more isn't likely to help you very much. What you really need is a robust and killer-fast disk I/O subsystem.
See the archives for more information on this subject, and also Mailman FAQ entries <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq04.011.htp>, <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq04.012.htp>, <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq02.002.htp>, <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq06.006.htp>, and <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq06.008.htp>.
Then, depending on whether you use Exim, Sendmail, Postfix, or Qmail, see <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq06.002.htp>, <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq06.003.htp>, <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq06.004.htp>, or <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq06.005.htp>, respectively.
There's lots of good extra stuff mentioned at the top of <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq06.003.htp>, so even if you use an MTA other than Sendmail, I recommend that you check out this entry.
-- Brad Knowles, <[EMAIL PROTECTED]>
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
-Benjamin Franklin, Historical Review of Pennsylvania.SAGE member since 1995. See <http://www.sage.org/> for more info.
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