[Dovecot] How many concurrent IMAP sessions?

[Chris Wakelin]

Timo Sirainen wrote:
> On Wed, 2009-09-30 at 11:48 -0400, Timo Sirainen wrote:
>> So it basically just issues NOOP commands and does no disk I/O (opens no
>> index files or anything). Looks like each imap process uses about 420 kB
>> of memory (420 MB total according to "free" before/after). That's
>> actually more than I thought. Wonder if I could decrease it..
> 
> Actually imaptest was using about 50 MB and other Dovecot processes
> maybe 5-10 MB, so it was more like 360 kB per imap process. Slightly
> better but I think it could still lose 100-200 kB :)
> 

On our live system we've got 1255 concurrent IMAP processes with an
average of 732KB private memory each (the rest of the memory should be
shared), but they're not (all) idle :)

(using Solaris 8 pmap command: "pgrep imap | xargs -i pmap -x {} | awk
'/^total/{tot+=$6;num++}END{print tot, num, tot/num}'")

Best Wishes,
Chris

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Christopher Wakelin,                           c.d.wakelin at reading.ac.uk
IT Services Centre, The University of Reading,  Tel: +44 (0)118 378 8439
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