> Hi everyone! > > I've been trying to tweak my cyrus system to improve performance. I have > a > few programs (smtp-sink that came with postfix) that I use to test my > server. I used smtp-sink to send 100 messages to a random set of 20 > different accounts (2,000 messages total; average time to send is about 60 > sec). That part works great, or well enough at least. :) It takes about > 2 > seconds to send 100. Not as fast as a lot of the other system specs I > have > seen out there, but I'm using mysql for virtual users and a ton of > expensive > filtering lookups in my mta, so it takes that long to shove them into the > queue manager. Anyway, I've noticed that postfix can only deliver so many > messages at a time to lmtp. I'm using lmtp as the delivery method, going > over a local tcp/ip transport (I was using lmtp:unix files previously, no > significant difference in performance between the two). After all of the > mail is injected into the postfix queue, it takes about 30 seconds to > deliver all 2,000 into the correct mailboxes. Really not that bad imho, > but > I'm wondering if it could be better. :) My goal is to get cyrus to keep > up > with postfix, if that's possible. > > I've tried all sorts of things, mostly blind guesses though. I switched > from lmtp:unix to straight lmtp tcp/ip, that didn't make a difference at > all. I also disabled "duplicatesuppression" in imapd.conf at the expense > of > losing sieve (cringe), but that didn't make a significant difference > either. > It took about 40 seconds to deliver 2000 messages with > duplicatesuppression > enabled, about 8-10 seconds longer than when duplicatesuppression was > disabled. Also, a postfix related control, I have > lmtp_destination/recipient_concurrency_limit set to 300. I have expanded > this as high as 1000 but with not impact, which leads me to believe there
I have this on one box in postfix/main.cf: local_transport = lmtp:unix:/var/lib/imap/socket/lmtp local_destination_recipient_limit = 1000 What database backends are you using in cyrus and what filesystems do you use for the cyrus dirs? I think that's where you could optimize things. However I don't know whether your numbers are good or bad because I never had a performance problem. Simon > must be something I can do with cyrus to get it to accept more mail at one > time. > > As a side note, when I run my programs, it brings my dual xeon 2.4ghz > processors to 80% utilization (2 gigs of ram and raid 0). :D Not > important > to the problem I don't think, but there ya go anyway, just if you are > curious. > > Any ideas? Let me know if I left something out. > > Cyrus IMAP4 v2.1.16 > postfix 2.0.16 > mysql 4.x (allows 1000 concurrent connections) > > Thanks! > >
