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

[Tobias Oetiker]

----- On Sep 3, 2021, at 10:06 AM, Aki Tuomi aki.tuomi at open-xchange.com wrote:

>> On 03/09/2021 10:25 Tobias Oetiker <tobi at oetiker.ch> wrote:
>> 
>>  
>> ----- 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
>> 
> 
> Which version of dovecot are you running?
>

2.3.9

I am planning to do a testsetup and maybe add mtrace to the code to see who is using this memory ... :)

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