Hello, I trying to migrate one big cyrus imap server from 2.4 to 2.5.9. I updated binaries, fix db backend in imapd.conf and converted mailboxes.db with ctl_mboxlist -d & -u to twoskip. cyrus ran fine until morning when a count of simultanious sessions started to rise. then imapd processes become locked on mailboxes.db when logs show something like Nov 17 08:04:21 srv1 imap[11019]: cmdtimer: 'yo@xxxxxxxx' 'list' '<none>' '46.741322' '0.000000' '46.741322' Nov 17 08:04:21 srv1 imap[11019]: buf: A1 LIST "" "*" I converted mailboxes.db back to skiplist and got a bunch (10-20 per sec) of following logs: Nov 17 09:59:09 srv1 imap[5352]: skiplist: longlock /var/imap/mailboxes.db for 177.7 seconds Nov 17 09:59:09 srv1 imap[6760]: skiplist: longlock /var/imap/mailboxes.db for 169.7 seconds Nov 17 09:59:09 srv1 imap[6764]: skiplist: longlock /var/imap/mailboxes.db for 171.7 seconds Nov 17 09:59:09 srv1 imap[5230]: skiplist: longlock /var/imap/mailboxes.db for 171.8 seconds Nov 17 09:59:09 srv1 imap[5251]: skiplist: longlock /var/imap/mailboxes.db for 203.2 seconds Nov 17 09:59:09 srv1 imap[5221]: skiplist: longlock /var/imap/mailboxes.db for 168.9 seconds then I rolled back to cyrus 2.4 (converting mailboxes.db back to old format) and the server started to work just fine again. I run 8core 16gb box with mailboxes.db on SSD disk, noswap, Linux 4.4.8-hardened glibc-2.20 x86_64-pc-linux-gnu-4.8.4 on Gentoo mailboxes.db is ~200Mb depending of format 135M /var/imap/mailboxes.plain 180M /var/imap/mailboxes.db.skiplist.24 215M /var/imap/mailboxes.db.skiplist.25 262M /var/imap/mailboxes.db.twoskip.25 Any ideas or suggestion for investigation ? Best, Deniss ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
