[Dovecot] dovecot performance

[tomas at tuxteam.de]

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On Fri, Aug 15, 2008 at 03:37:53PM -0300, Sebastien Tandel wrote:

[...]

>> [fork is fast]

> OK, it measures the fork instruction. But fork is using a copy-on-write 
> mechanism ... It means that *none* of the parent's memory pages are copied. 
> Each page is simply *shared* by *all* the child /until/ a modification is 
> made to it.Therefore this test obviously does not take into account time 
> taken when modifying data. And I strongly suspect that dovecot is not only 
> doing read-only access to memory when running. :-/

Yep, but what can you do after pre-forking and before the request comes
in?

Thus I'd expect pre-forking not to save us much which can't be saved by
prudent programming (save mentioned exception of > thousands of connects
per second).

We are now deeply in specula-land, I guess ;-)

Regards
- -- tomás
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