how many users can Cyrus server support? -- is 5.5 msg/sec sl ow?

[Su Li]

Maybe I should try this:

For each hostname say a1.xzt.com, b2.xzt.com and c3.xyz.com, I use one Cyrus
IMAP Server. I think I can some how may it working on Sendmail. By that I
can run multiple copies of IMAP Server. I hope that can speed things up.

Su

-----Original Message-----
From: Jeremy Rumpf [mailto:jrumpf at heavyload.net]
Sent: September 27, 2002 12:11 PM
To: info-cyrus at andrew.cmu.edu
Subject: Re: how many users can Cyrus server support? -- is 5.5 msg/sec
sl ow?


> Do you really think that
> you run into performance problems with 25 msg/sec ? Do you _really_
> think that 25 msg/sec is so bad ? 25 msg/sec times 60 are 1500 msg/min
> times 60 are 90000 msg/hour times 24 are 2160000 msg/day ! Do you really
> think that your machine will have to handle over 2 million messages
> _every_ day  ? Isn't that 2 million message think more a peak value on
> high load situations than the approximately everyday situation ?

At peak loads, not really. The MTA front ends on the system I work on route 
about 1.5 million messages a day. More specific, one backend server (Sun 
E4000), with 70k users, accepts approx 10-20 messages per second with 30 or 
so POP attempts per second (Qpopper, no IMAP yet). This all at peak times 
between 10AM and 2 or 3PM. 

I agree that Su isn't seeing the performance he should be getting, but I
also 
see where he would _need_ this performance. Other alternatives for Su are
out 
there, such as clustering IMAP back ends using either Perdition   
http://www.vergenet.net/linux/perdition/ or the Murder system.

His use of Linux should not be a major issue.