On Wed, Feb 11, 2009 at 04:47:40PM -0500, Silas Boyd-Wickizer wrote:
> There are many messages
> waiting for delivery, so why doesn't postfix run more virtuals
> to increase concurrency?
Because it can't decide where to send the mail any faster. This thread
is not very productive, the benchmark is measuring a part of the system
that is never the bottle-neck in real configurations.
If you test a real configuration and you don't over-saturate the input
rate, you'll find that the incoming queue stays small, and throughput
is disk I/O limited. If you then push harder (more input concurrency),
throughput will drop-off slowly as input I/O starves output I/O and
the queue manager.
--
Viktor.
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