On 28 Mar 2007, at 18:15, Timo Sirainen wrote:
- 16. stalled for 16 secs in LOGIN
Try changing http://wiki.dovecot.org/LoginProcess settings, especially
login_process_per_connection=no and see how much it helps.
Sorry I forgot to give my current login and auth settings (which, I
have to admit, I thought I'd tuned to be reasonable/generous for the
eventual environment)...
login_process_size = 64
login_process_per_connection = no
login_processes_count = 10
#login_max_processes_count = 128
#login_max_connections = 256
#auth_process_size = 256
auth_cache_size = 1024
auth_cache_ttl = 600
#auth_worker_max_count = 30
auth default {
passdb shadow {
# [blocking=yes] - See userdb passwd for explanation
#args =
}
userdb passwd {
# [blocking=yes] - By default the lookups are done in the main
dovecot-auth
# process. This setting causes the lookups to be done in auth
worker
# proceses. Useful with remote NSS lookups that may block.
# NOTE: Be sure to use this setting with nss_ldap or users might
get
# logged in as each others!
#args =
}
}
Also you could use logout=0 parameter to imaptest to avoid the
login/logout overhead.
Re-running the test with logout=0 didn't help :-( ...
% ./imaptest10 user=test%03d host=testserver.imap.york.ac.uk
clients=50 mbox=./dovecot.mbox msgs=1000 secs=30 logout=0
Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe
100% 50% 50% 100% 100% 100% 50% 100% 100% 100%
30% 5%
5 1 1 5 1 0 0 0 0 0 25/ 25 [50%]
3 2 0 2 0 0 0 0 0 0 34/ 34 [68%]
3 1 2 3 0 0 0 0 0 0 43/ 43 [86%]
1 1 1 2 0 0 0 0 0 0 46/ 46 [92%]
2 1 1 3 0 1 1 1 1 1 50/ 50
1 0 0 0 0 0 0 0 0 0 50/ 50
2 2 1 3 0 0 0 0 0 0 50/ 50
2 1 1 1 1 0 0 0 0 0 50/ 50
0 1 0 1 0 0 0 0 0 0 50/ 50
1 1 1 1 0 1 0 1 1 1 50/ 50
Logi List Stat Sele Fetc Fet2 Stor Dele Expu Appe
100% 50% 50% 100% 100% 100% 50% 100% 100% 100%
30% 5%
2 0 1 3 1 0 0 0 0 0 50/ 50
1 0 0 1 0 0 0 0 0 0 50/ 50
1 1 1 1 0 0 0 0 0 0 50/ 50
1 0 0 0 0 0 0 0 0 0 50/ 50
1 1 2 2 0 1 0 1 1 1 50/ 50
- 12. stalled for 16 secs in LOGIN
- 13. stalled for 16 secs in LOGIN
- 15. stalled for 16 secs in LOGIN
1 0 1 2 0 0 0 0 0 0 50/ 50
- 12. stalled for 17 secs in LOGIN
- 13. stalled for 17 secs in LOGIN
- 15. stalled for 17 secs in LOGIN
- 17. stalled for 16 secs in LOGIN
- 19. stalled for 16 secs in LOGIN
- 20. stalled for 16 secs in LOGIN
- 21. stalled for 16 secs in LOGIN
- 24. stalled for 16 secs in LOGIN
...
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