Jacek Grabowski via Postfix-users:
> Is there any option to set up how long the smtpd process will exist ?
> I noticed that after the connection ends, the smtpd process still exists
> for several dozen seconds. Can this time be shortened to a few seconds?
> Thank you.
Wietse:
> That would bad for performance. What problem are you trying to solve?
Jacek Grabowski:
> Actually i don't have any problem, just pure curiosity :)
> Maybe in case of very small smtp traffic I would like to try not to waste
> memory usage to make it available for other processes.
There are two ways: a) terminate every process after every request,
and b) reuse processes to avoid the overhead for precess creation
and process initialization (a 'working set' model that keeps
recently-used processes ready for more requests).
Postfix is optimized for the second model; it is architected as a
collection of cooperating services.
Between accepting and delivering mil, Postfix uses about five
different non-persistent processes, and two persistent master and
scheduler processes. Starting up and tearing down each non-persistent
process for each request would be slow (though not as slow as in
the old days of rotating disks and tiny OS buffer caches).
Wietse
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