[Dovecot] 2.0, hourly performance stats

[Timo Sirainen]

On 8.11.2010, at 7.34, Ralf Hildebrandt wrote:

> I'm getting constantly high numbers of page reclaims & involuntary
> context switches for dovecot/auth.

Is it intentional that you have both passdb shadow and passdb pam enabled?

> page reclaims = minor faults = cpu switching back to system-mode, But
> why is the auth process doing that so excessively? Same for the large
> number of involuntary context switches...

I'm not sure. But:

> type	        real	user	sys	reclaim	faults	swaps	bin	bout	signals	volcs	involcs
> auth	        205.93	1.32	2.76	25280	0	0	0	0	0	261	1425

It's still only 2.76 seconds of system CPU from the total of 205 seconds it was running, so that can't really cause the big system CPU usages you see..

> ssl-params	288.71	0.40	0.48	468	0	0	8	0	0	8	1
> pop3	        0.59	0.80	0.20	651	0	0	48	16	0	12	13
> managesieve	0.51	0.00	0.28	576	0	0	416	0	0	13	7
> imap	        4677.82	0.19	0.89	1480	0	0	488	16	0	23550	136
> pop3-login	181.77	0.32	0.28	780	0	0	8	0	0	46	9

Same for the rest of these processes.

What about after you stop Dovecot? Then you should see lines from the permanently running processes (master, anvil, log).