Again this is active sync devices that are connecting with a ton of pushed folders. The more you tell it to sync (folders) the more processes it's going to fork for each user folder. Is this affecting performance that bad? What's your hardware?
- Paul
> On Sep 22, 2015, at 7:43 PM, Moby <moby@xxxxxxxxxxxxxx> wrote:
>
>
>
> On 9/22/2015 18:12, Shaheen Bakhtiar wrote:
>>> On Sep 22, 2015, at 2:17 PM, Andrew Morgan <morgan@xxxxxxxx> wrote:
>>>
>>>> On Tue, 22 Sep 2015, Shaheen Bakhtiar wrote:
>>>>
>>>> It happened again….. although it took longer for it to happen, this has been happening only since the upgrade in Jun.
>>>>
>>>> The number of imap processes continues to increase until the server is completely OOM. the increase is drastic and all of a sudden.
>>> You should probably set maxchild to a value that won't run your server out of memory. :)
>>>
>>> Have you looked at the processes to see what they have in common? For example, sometimes an IMAP client will run amok and make hundreds or thousands of connections. Or perhaps the processes are all stuck waiting on a lock, etc.
>>>
>>> lsof, strace, netstat, and your Cyrus logs can help a lot.
>>>
>>> Andy
>>
>>
>> [shawn@postoffice ~]$ ps aux | grep imapd | wc -l
>> 255
>> [shawn@postoffice ~]# ps aux | grep imapds | wc -l
>> 1
>> [shawn@postoffice ~]# ps aux | grep pop3d | wc -l
>> 9
>> [shawn@postoffice ~]# ps aux | grep timseived | wc -l
>> 1
>> [shawn@postoffice ~]# ps aux | grep lmtpunix | wc -l
>> 1
>>
>> Based on that output I changed the configuration file (below) adding maxchild. Most likely all my users have their clients open, and from previous monitoring I average about 200 instances of imapd:
>>
>> # standard standalone server implementation
>>
>> START {
>> # do not delete this entry!
>> recover cmd="ctl_cyrusdb -r"
>>
>> # this is only necessary if using idled for IMAP IDLE
>> idled cmd="idled"
>> }
>>
>> # UNIX sockets start with a slash and are put into /var/lib/imap/sockets
>> SERVICES {
>> # add or remove based on preferences
>> imap cmd="imapd" listen="imap" prefork=5 maxchild=300
>> imaps cmd="imapd -s" listen="imaps" prefork=1 maxchild=100
>> pop3 cmd="pop3d" listen="pop3" prefork=3 maxchild=5
>> pop3s cmd="pop3d -s" listen="pop3s" prefork=1 maxchild=5
>> sieve cmd="timsieved" listen="sieve" prefork=0
>>
>> # these are only necessary if receiving/exporting usenet via NNTP
>> # nntp cmd="nntpd" listen="nntp" prefork=3
>> # nntps cmd="nntpd -s" listen="nntps" prefork=1
>>
>> # at least one LMTP is required for delivery
>> # lmtp cmd="lmtpd" listen="lmtp" prefork=0
>> lmtpunix cmd="lmtpd" listen="/var/lib/imap/socket/lmtp" prefork=1
>>
>> # this is only necessary if using notifications
>> # notify cmd="notifyd" listen="/var/lib/imap/socket/notify" proto="udp" prefork=1
>> }
>>
>> EVENTS {
>> # this is required
>> checkpoint cmd="ctl_cyrusdb -c" period=30
>>
>> # this is only necessary if using duplicate delivery suppression,
>> # Sieve or NNTP
>> delprune cmd="cyr_expire -E 3" at=0400
>>
>> # this is only necessary if caching TLS sessions
>> tlsprune cmd="tls_prune" at=0400
>> }
>>
>>
>>
>> Comments, concerns??? I’m going to keep observium open on a separate screen and watch when it starts going up, than do the lsof,netstat, and watch logs to see if I can tell why the sudden upticks.
>> ----
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> I have seen that when some of my users fiddle around on their iphone -
> usually the complaints start with "I cannot get mail on my phone" and
> around the same time the process count starts going up. Very
> intermittent though, and has not occurred since all users upgraded to
> IOS 9. Just my USD 0.02 worth...
>
> --
> --Moby
>
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