> On 24 February 2018 at 15:47 Neil Jerram <n...@ossau.homelinux.net> wrote: > > > Aki Tuomi <aki.tu...@dovecot.fi> writes: > > > On 24 February 2018 at 12:45 Neil Jerram < n...@ossau.homelinux.net> > > wrote: > > > > Please could you help me to understand and fix why my dovecot IMAP > > performance is so bad? I've read through a lot of the > > performance-related material on the website, but I don't think that any > > of it could account for slowness at the level that I am seeing. > > > > The simplest scenario is moving a message from my Inbox to another IMAP > > folder. Using Gnus as the client, the whole UI freezes for about 2 > > minutes (which I assume is until the move is complete), and journalctl > > on the dovecot server says: > > > > Feb 24 10:24:24 arudy dovecot[1712]: imap(neil): Warning: Transaction log > > file /home/neil/dovecot-mail/.imap/INBOX/dovecot.index.log was locked for > > 98 seconds (Mailbox was synchronized) > > > > or the same message with (rotating while syncing). > > > > There must be something badly wrong in my setup, or perhaps in the spec > > of the server that dovecot is running on. What should I look at to > > start understanding this better? > > > > Many thanks - Neil > > > > Can you tell a bit more about your environment? Sounds like io issue > > Thanks for your reply. I'm not sure exactly what you have in mind, but > here are some starting points: > > arudy:~# uname -a > Linux arudy 4.13.0-1-686-pae #1 SMP Debian 4.13.4-2 (2017-10-15) i686 > GNU/Linux > > arudy:~# dovecot -n > # 2.2.32 (dfbe293d4): /etc/dovecot/dovecot.conf > # Pigeonhole version 0.4.20 (7cd71ba) > # OS: Linux 4.13.0-1-686-pae i686 Debian buster/sid > auth_mechanisms = plain login > auth_username_format = %Ln > auth_verbose = yes > login_trusted_networks = 192.168.11.8 > mail_access_groups = mail > mail_fsync = never > mail_location = mbox:~/dovecot-mail:INBOX=/var/mail/%u
You are using mbox format. This is ... bit slow. =) When you move mails between mbox files, it has to rewrite the entire mbox file every time. You should probably start using maildir or sdbox instead. Aki
