number of imapd processes never decrease

[Konrad Mauz]

Am 17.09.2015 16:18, schrieb Vladislav Kurz:
> On Thursday 17 of September 2015 you wrote:
>
>> I would consider how many users you have connected as well as each type of
>> device. If you are running some type of AS setup, each device will
>> maintain an open connection and cause a process to happen. How many users?
> What do you mean by AS setup? Autonomous system? nothing like that.
> Clients use thunderbird, outlook, mobile phones, webmail.

I think Paul mean AS = Active Sync.

>
> I don't know the exact number of imap users, because some users still use pop3
> (which has short-lived connections). Currently there are about 200 imapd
> processes. (Plus another 60 "imapd -s").
>
> I think every client is going to be turned off, rebooted, or out of battery
> from time to time. So I feel like there are some processes "forgotten",
> keeping the connection with nobody on the other end.

I think this too. Yesterday afternoon I changed the imapd.conf 
configoption "tcp_keepalive" from 0 to 1.
The number of imapd processes dropped from 2800 ( yesterday 7:00am ) to 
arround 1000 ( today 7:00am ).

When I understand tcp keepalive correctly, the systems now checks from 
time to time ( every 2 hours by default on linux systems ) with an ACK 
package
if the tcp connection endpoint is still reachable.

I am neither an cyrus nor an tcp/ip expert, so a comment from an expert 
would be nice.

Regards,

Konrad


>


-- 
Hochschule Konstanz - Rechenzentrum
Konrad Mauz kmauz at htwg-konstanz.de
Tel: +497531206-472, Fax: -153
http://www.htwg-konstanz.de/rz.html


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