I'm running spamd/spamc v 2.55 on a Compaq DS20 running Tru64 UNIX v 5.1b. It processes ~ 5,500 pieces of email per day. Every week or so the system slows to a point where I must reboot. I believe I've eliminated all causes other than the spamd process. I've throttled it down to spamd -d -m 2 and this has helped so far. Does anybody have any helpful info on this?
I'm about to start investigating Perl on Tru64. We have two DS20Es in a TruCluster running 5.1A. SA is processing around 80,000 messages per day. Of course it's not evenly distributed and we've had severe problems when it climbs above 22,000 per hour. The load average soars to 40 or 60, and the box just crawls. If we leave it alone it will eventually recover but mail delivery is definitely impacted. Sometimes I just shut SA down for a bit to clear out the mail queues. We've done a bunch of performance tuning with HP and it helped a little. The load average is still floating around 20 though. These boxes, in addition to running SA and our MTA also support 1300 simultaneous IMAP connections so the load isn't all SA.
Last week, for unrelated reasons, I decided to temporarily put spamd on a Linux box. It's a 2.6gHz Zeon box running RedHat 7.3. To my amazement the load average on the Tru64 boxes dropped to 3-4 and the load on the Linux box never exceeds 2. So, for some reason spamd is _much_ more efficient under Linux than under Tru64. My guess is it has something to do with the Perl installation but I'm not sure yet.
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