Hi
I recently (about 2 weeks ago) moved over my users over to a new version of dovecot (2.0.9) and now the memory usage on the new server seems much higher than it was before. The new server is a CentOS 6 VM with 4 GB of RAM and 4 CPUs and according to top, it's used up all of the RAM and all of the Swap. Here's a sample of the output from top (sorted by allocated memory).
top - 10:42:36 up 22 days, 21:57, 1 user, load average: 1.04, 1.40, 1.52
Tasks: 1643 total, 1 running, 1642 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.7%us, 0.7%sy, 0.0%ni, 93.3%id, 5.1%wa, 0.0%hi, 0.1%si,
0.0%st
Mem: 3924432k total, 3779236k used, 145196k free, 23740k buffers
Swap: 4063228k total, 3181164k used, 882064k free, 156420k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 16738 root 20 0 399m 182m 436 S 0.0 4.8 5:50.58 config 18790 dovenull 20 0 54528 11m 2036 S 0.0 0.3 0:00.05 imap-login 22277 dovenull 20 0 54528 11m 2156 S 0.0 0.3 0:00.04 imap-login 22796 dovenull 20 0 54528 11m 2140 S 0.0 0.3 0:00.03 imap-login 22749 dovenull 20 0 54528 11m 2148 S 0.0 0.3 0:00.03 imap-login 22825 dovenull 20 0 54528 11m 2156 S 0.0 0.3 0:00.03 imap-login
This is with 1015 imap processes and 484 imap-login processes. The old version was 1.0.rc15 and running on a CentOS 4 box with 2GB of RAM. It was overloaded but the RAM usage wasn't maxed out like this one is (not much swap usage and a large amount of cached memory).
Is this amount of memory usage normal? What could be causing it, if it isn't?
Thanks for your help,
Hanna
Here is the output of dovecot -n:
# 2.0.9: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-431.29.2.el6.x86_64 x86_64 CentOS release 6.5 (Final) nfs auth_verbose = yes disable_plaintext_auth = no listen = * login_greeting = Ready. mail_debug = yes mail_location = maildir:/mail/%1Lu/%u:INDEX=/var/cache/dovecot/indexes/%1Lu/%u mail_plugins = " mail_log notify" maildir_very_dirty_syncs = yes mbox_lazy_writes = no namespace { inbox = yes location = prefix = separator = / type = private } passdb { args = /etc/dovecot/dovecot-ldap-pass.conf driver = ldap } plugin { mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename mail_log_fields = uid box msgid size } protocols = imap pop3 service anvil { client_limit = 1250 } service auth { client_limit = 4300 user = root } service imap-login { process_limit = 600 service_count = 1 } service imap { process_limit = 1536 } service pop3-login { process_limit = 600 service_count = 1 } service pop3 { process_limit = 1536 } ssl_ca = _postmaster@example.com_ }
--
Hanna Ruotsalainen Coordinator of Information Applications, IT Services | tel 604 844 3875 local 3875
emily carr university of art + design http://www.ecuad.ca | 1399 Johnston Street, Vancouver BC V6H 3R9