[Dovecot] dovecot performance

[tomas at tuxteam.de]

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On Thu, Aug 14, 2008 at 03:38:50PM -0300, Giorgenes Gelatti wrote:
> Hello All,

[...]

> It is well known that preforking is a good pratice if you want to
> achieve a higher performance.
> When I was asked about it I readily answered: "of course it does". For
> my surprise later, i doesn't.

With fork latencies in the range of 500 to 1500 microseconds (on Pentium
900 MHz-class hardware!) on most modern kernels[1] I wonder whether this
"good practice" isn't on the verge of voodoo ;-)

(Of course, in a http server, where you might expect thousands of
connects per second, this is another story -- which is mitigated by HTTP
1.1, when properly streaming several requests per connection).

- ----------------
[1] <http://bulk.fefe.de/scalability/>, search "The fork benchmark"

Regards
- -- tomás
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