Re: [AMaViS-user] mail processing bottleneck

On 4/18/08, MK <info@ea80.net> wrote:
> hi list,
>
> i am trying to find out at which position of my mail-processing chain
> the bottleneck is - or which parameter is maybe misconfigured...
>
> my setup is (each newest stable version)
> sendmail <-> amavisd-milter <-> amavisd-new <-> clamd/spamassassin
>
> i noticed that the number of processed messages is constant at
> approx 1-2 messages per second (which is NOT that much, i think).
> CPU load is avrg 40%.
>
> anyone with a similar setup here to tell me the corresponding values
> for "max_server"-like parameter for each station in the chain?
> or how to dig for the bottleneck?
>
> thanks in advance
>
> MK
>

What is your hardware like and how many $max_servers are you running?

If you run amavisd-new at $log_level = 2; for a minute or so, you will
get some TIMING data that will show that 95% of the time spent is on
spamassassin scanning. SA is CPU intensive and queries many external
network resources (RBLs etc.), so additionally it is subject to high
delays. A local caching DNS server helps here. If other resources like
Razor, Pyzor and DCC are utilized, you can expect further delays
(mostly from Pyzor - especially if using the default server). There
have been a few posts looking for the same type info, like this one
for example:

http://marc.info/?l=amavis-user&m=120283445607760

It would be cool if someone were to take the time to create a document
outlining all the ways that SA could be performance tuned. There seems
to be an increasing need.

On a powerful system with a lot of $max_servers running, eventually
one may reach the point where the disks can't keep up.

--
Gary V

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