Re: Many IDLE imap processes but very few connections moved to imap-hibernate

[D D]

Well I'm not sure what happened but the issue seems to have resolved itself 
somehow:

$ ps aux | grep "dovecot/imap" | wc -l
2168
$ ps aux | grep "dovecot/imap" | grep IDLE | wc -l
56
$ ps aux | grep "imap-hibernate"
syslog863411  0.4  0.0  16660 15296 ?S09:07   1:40 
dovecot/imap-hibernate [2298 connections]

Since my initial message we played with the following settings which seem 
unrelated to hibernation:

mail_debug
haproxy_trusted_networks
mmap_disable
mail_fsync
mail_nfs_index
mail_nfs_storage
mail_max_userip_connections

I'll try to provide more info if the issue arises again.
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Many IDLE imap processes but very few connections moved to imap-hibernate

[pierre . alletru]

Hi Dovecot community!

I have a strange issue with imap-hibernate. Or more likely it behaves as it's 
supposed to and it's just that I don't really understand it.

I have enabled it, and it works, but for some reason hibernation happens only 
to a tiny amount of connections, whereas I have a lot of IDLE imap processes. 
And I can't find any relevant errors in the logs.

##  config ##
mail_debug = yes
verbose_proctitle = yes

$ doveconf imap_hibernate_timeout
imap_hibernate_timeout = 5 secs
$ doveconf -a | grep -A 21 'service imap-hibernate'
service imap-hibernate {
  chroot = 
  client_limit = 0
  drop_priv_before_exec = no
  executable = imap-hibernate
  extra_groups = 
  group = 
  idle_kill = 0
  privileged_group = 
  process_limit = 0
  process_min_avail = 0
  protocol = imap
  service_count = 0
  type = 
  unix_listener imap-hibernate {
group = $default_internal_group
mode = 0660
user = 
  }
  user = $default_internal_user
  vsz_limit = 18446744073709551615 B
}

## imap processes ##

$ ps aux | grep "dovecot/imap" | wc -l
2214
ps aux | grep "dovecot/imap" | grep IDLE | wc -l
1258
$ ps aux | grep "imap-hibernate"
syslog   1571453  0.0  0.0   4748  3156 ?S15:44   0:00 
dovecot/imap-hibernate [18 connections]

As you can see here I have 1258 IDLE imap processes (out of 2214 in total), and 
only 18 connections in imap-hibernate. I'd like to have all IDLE processes to 
be moved to imap-hibernate in order to save up memory.

Any idea why these 1k+ IDLE imap processes are not moved into imap-hibernate?

Thank you!
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