Roundcube performance

[Friedemann Schorer]

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. 

Maybe it's worth a try, I had very positive experiences with it. 

Best regards, 

Friedemann 

Am 19.09.2014 18:45, schrieb Toke Høiland-Jørgensen: 

> Enrico Tagliavini <enrico.tagliavini at gmail.com> writes:
> 
>> 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.
> 
> 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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