Hi, I've got an imap server being hammered by a program that is constantly connecting via IMAP, searching, reading and deleting emails. At a very rough estimate there'll be 10 to 20 new emails every minute that arrive, are checked and deleted. The original machine is running 2.3.16 without replication and the average load rarely went over 1. On the new server running 2.4.12 (details below) I'm seeing the average load hover around 5 constantly. The new box is running replication and this appears to be set up correctly as the logs look pretty clean. top shows CPU percentage for each imapd process running quite high. The largest mailbox contains about 3000 emails and is usually at 50 to 60% CPU. I/O for the machine looks fine, I'm not seeing any iowait or high usage with iostat. It's using local disks so not something I would expect to be a problem. Can anyone suggest where I could start looking to find the cause? Or point me in the direction of configuration options that are known to have such an effect after upgrading between the two version? Thanks Guy New server: name : Cyrus IMAPD version : v2.4.12-Invoca-RPM-2.4.12-2el5_2 63b65d1c 2011-10-04 vendor : Project Cyrus support-url: http://www.cyrusimap.org os : Linux os-version : 2.6.18-238.el5 environment: Built w/Cyrus SASL 2.1.22 Running w/Cyrus SASL 2.1.22 Built w/OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 Running w/OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 Built w/zlib 1.2.3 Running w/zlib 1.2.3 CMU Sieve 2.4 TCP Wrappers mmap = shared lock = fcntl nonblock = fcntl idle = idled imapd.conf: admins: cyradmin cyradmin-repl configdirectory: /var/lib/imap delete_mode: immediate duplicate_db: skiplist expunge_mode: default hashimapspool: 1 improved_mboxlist_sort: 1 lmtp_downcase_rcpt: 1 munge8bit: 0 partition-default: /var/spool/imap ptscache_db: skiplist sasl_pwcheck_method: saslauthd sendmail: /usr/sbin/sendmail sievedir: /var/lib/imap/sieve statuscache_db: skiplist sync_authname: cyradmin-repl server101_sync_host: 10.10.10.10 server201_sync_host: 10.11.10.11 sync_log: 1 sync_log_channels: server101 server201 sync_password: replpass tls_ca_file: /etc/ssl/certs/domain.com.ca-bundle tlscache_db: skiplist tls_cert_file: /etc/ssl/certs/domain.com.crt tls_key_file: /etc/ssl/certs/domain.com.key unix_group_enable: 0 normalizeuid: 1 -- Don't just do something...sit there! ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/
