100 MB RAM per clinet in an imap-proxy setup ...

[Tobias Oetiker]

----- On Sep 3, 2021, at 9:01 AM, Aki Tuomi aki.tuomi at open-xchange.com wrote:

>> On 03/09/2021 09:35 Tobias Oetiker <tobi at oetiker.ch> wrote:
>> 
>> 
>> Hi All,
>> 
>> I spent some quality time yesterday, tuning dovecot on a server which serves as
>> an imap-proxy in front of a zimbra setup
>> the imap proxy does ldap client-cert authentication and works well.
>> 
>> BUT
>> 
>> I found that the imap-login processes seem to gain 100 MB per connection they
>> are accepting ... this seems pretty hefty.
[...]
> 
> I would strongly recommend using "high performance" configuration on your proxy.
> 
> See https://doc.dovecot.org/admin_manual/login_processes/#high-performance-mode

yes that is what we have:

 service imap-login {
  service_count = 0
  client_limit = 380
  process_limit = 10
  vsz_limit = 39G
 }

the machine has 180 GB ram

cheers
tobi

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
www.oetiker.ch tobi at oetiker.ch +41 62 775 9902