[Dovecot] load increase after upgrade to 2.0.8

[Ralf Hildebrandt]

* Timo Sirainen <tss at iki.fi>:

> So with Ralf's previous statistics for one hour:
> 
> v2.0:
> 6887 imap logouts (processes)
> 26672928 voluntary context switches (3872 / process)
> 1313631 involuntary context switches (190 / process)
> 
> v1.2:
> 6832 imap logouts (processes)
> 1003200 voluntary context switches (146 / process)
> 155566 involuntary context switches (22 / process)
> 
> The v1.2 values look pretty good. v2.0's involuntary context switches
> isn't too bad either. So where do all the 3700 new voluntary context
> switches come from? The new method of initializing user logins can't
> add more than a few more of those. Running imaptest locally I get
> similar volcs values for v1.2 and v2.0. Wonder if you get different
> values?

How exactly would I run imaptest...?

> If you don't mind some huge logs, you could also try the attached patch
> that logs the voluntary context switch count for every executed IMAP
> command. Maybe some command shows up that generates them much more than
> others.

I can try that, but today and friday I'm busy, and then it's weekend :(


-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | http://www.charite.de