Number of imap process increasing over time

[Dan White]

On 08/14/15 08:11 -0700, Shaheen Bakhtiar wrote:
>> On Aug 14, 2015, at 8:03 AM, Dan White <dwhite at olp.net> wrote:
>> On 08/14/15 07:46 -0700, Shaheen Bakhtiar wrote:
>>> Ever since the rebuild we are experience an ever growing number of imapd
>>> processes, when we first boot the server we have ~200 using 2.4G of
>>> memory. In about 3 to 4 days we have ~1500 imapd processes taking up all
>>> available physical memory and all all available swap memory (an additional
>>> 4G).
>>>
>>> and our logs are filled with messages like:
>>> Aug 14 06:26:01 postoffice kernel: Out of memory: Kill process 15427 (imapd) score 1 or sacrifice child
>>> Aug 14 06:26:01 postoffice kernel: Killed process 15427 (imapd) total-vm:179648kB, anon-rss:7756kB, file-rss:672kB
>>
>> How many processes spawn is configurable within /etc/cyrus.conf. How do you
>> have your imap entries configured?
>
>[shawn at postoffice ~]$ more /etc/cyrus.conf

>  imap		cmd="imapd" listen="imap" prefork=5
>  imaps		cmd="imapd -s" listen="imaps" prefork=1

You can limit the damage with a maxchild option (cyrus.conf(5)).

-- 
Dan White