[Dovecot] Debugging with strace

[Timo Sirainen]

On Wed, 2006-05-10 at 10:20 -0500, Fran Fabrizio wrote:
> We have a dovecot install that is working fine for everyone except one 
> user, who complains that it takes a minute or longer to delete a single 
> message from the INBOX to Trash.  This is happening for him from 
> multiple IMAP clients so it appears to be server-side.

Are you using mboxes? Has his Trash mbox grown huge? Is this Dovecot
0.99.x or 1.0beta?

> I wanted to start up a test instance of dovecot alongside the production 
> one and test there.  So I copied dovecot.conf, put imap on port 10143, 
> and started up the test server like this:
> 
> # strace -tt dovecot -F -c /etc/dovecottest.conf

You want to give -f option also for strace.

> (I could not find the docs for -F but without it dovecot would quickly 
> detatch into a daemon and I could no longer strace it... so is -F for 
> putting dovecot in the foreground like I think?  :-)

Yep.

> 1.  My screen just scrolled continuously with poll calls - does dovecot 
> poll something every second even when it has no clients connected?

Yep.

> 2.  It appeared to interfere with the production install running 
> alongside of it - as I could no longer authenticate to it or copy 
> messages to my Sent folder when I sent something out through the 
> production dovecot.  I had to restart the production instance to get it 
> to behave.

Change base_dir in dovecot.conf to something else.
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