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<p>Just joined the list, so please excuse me if this has been mentioned before. Debian and Ubuntu have a package called imapproxy. I installed it and had roundcube use it and that dramatically speeded things up because roundcube frequently logs in and out of the IMAP server, which takes a lot of time, and imapproxy just opens one connection the the imap server and keeps it open.</p>
<p>Maybe it's worth a try, I had very positive experiences with it.</p>
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<p style="padding-left: 30px;">Best regards,</p>
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<p style="padding-left: 60px;">Friedemann </p>
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<p>Am 19.09.2014 18:45, schrieb Toke Høiland-Jørgensen:</p>
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<pre>Enrico Tagliavini <<a href="mailto:enrico.tagliavini@gmail.com">enrico.tagliavini@gmail.com</a>> writes:</pre>
<blockquote type="cite" style="padding-left:5px; border-left:#1010ff 2px solid; margin-left:5px">But adding a proxy, so that connection to the imap server is kept for a long time, is removing this delay. Which probably means imapd is actually fast reading messages from the disk, or preloads them (no idea about this, just a guess). So what probably is slow is the operations just after a user login, does this makes sense? I have prefork set to 10 on imapd in cyrus.conf I don't have much clues about how cyrus imap works, so any advise to make it a little bit faster, in a 3 users scenario, is appreciated.</blockquote>
<pre>This sounds like it might be related to the 'lock' and 'proc' files that
cyrus-imapd creates on every user login. I seem to recall having
horrible performance because of that at some point.
Basically, imapd creates a pid file in /var/lib/imap/proc on every
login, and a lock file in /var/lib/imap/lock on every folder access. If
the server is IOPS-limited this can cause large delays. The solution (if
this is indeed what you're experiencing) is to move these directories to
tmpfs; either symlink them into an existing tmpfs (such as /dev/shm or
/tmp depending on your setup), or stick this in your /etc/fstab:
none /var/lib/imap/proc tmpfs defaults 0 0
none /var/lib/imap/lock tmpfs defaults 0 0
and then mount the directories.
-Toke
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</pre>
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