[Dovecot] Dovecot waking every 50ms when doing nothing

[Ross Burton]

On Sun, 2007-06-03 at 18:13 +0300, Timo Sirainen wrote:
> > I did once try to reduce these unnecessary wakeups, but then I thought
> > it's probably not worth the trouble. No-one's going to run an IMAP
> > server in their laptop.. :)


:)

My poor laptop is running a IMAP server, a HTTP server and a SMTP
server.

> > This fixes it for imap/pop3-login:
> > http://hg.dovecot.org/dovecot/rev/0021765627f3

Sweet, although this still wakes up when there are clients connected
right?

> > Fixing dovecot-auth and dovecot processes is a bit more difficult.
> > Patches welcome. :)
> 
> Maybe the optimal solution would be to create a new abstraction layer.
> Most of the timeout handlers are just checking for idle timeouts.
> 
> struct idle_timeout *idle_timeout_new(unsigned int secs,
> timeout_callback_t *callback, void *context);
> void idle_timeout_free(struct idle_timeout *idle);
> void idle_timeout_reset(struct idle_timeout *idle);
> 
> The code would internally keep just one timeout handler and whenever
> it's called, calculate the new time when it should be called.

Sounds like what GLib does.  Glib also (in 2.13 onwards) lets you create
timeouts with second-resolution, so that N timers that go off at roughly
the same time do actually go off at the same time, meaning the
application wakes up once instead of N times.

I presume porting Dovecot to use the glib main loop abstraction (which
is nice and lean, the object system is a separate library) is out of the
question?

Ross
-- 
Ross Burton                                 mail: ross at burtonini.com
                                          jabber: ross at burtonini.com
                                     www: http://www.burtonini.com./
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