On Wed, Feb 11, 2009 at 01:41:19PM -0500, Silas Boyd-Wickizer wrote:
> Hello, I'm doing some experiments with a synthetic benchmark and
> postfix. My current postfix configuration can deliver ~3000
> msg/sec to 1000 virtual mailboxes; however, the system (16
> core/4x4 AMD opteron) is ~90% idle. All logs and queues reside
> in a RAM filesystem, so disk IO is not a bottleneck. I am
> generating the incoming load locally using (a slightly modified)
> smtp-source, so the network is not a bottleneck. smtp-source is
> generating 10k emails and smtpd/cleanup can put the incoming
> emails on the incoming queue much faster than the qmgr can pull
> them off. Besides the incoming and active queues, all queues are
> empty during the benchmark. Ideally I want the system to be 0%
> idle. Any suggestions on how to achieve this?
With 16 logical CPUs, in this configuration you'll find your CPU load
to be 1/16th of the theoretical maximum + overhead. Your report of 10%
is about right.
What exactly are you trying to measure with this "benchmark"?
No realistic configuration has the same critical resource, and you'll
run out of disk I/O throughput or CPU first depending on how CPU hungry
your content-filters are.
If you really are planning to host all spools in RAM disk, and need more
than 3000 msgs/sec, I am most curious what use-case motivates this design
and performance requirement.
--
Viktor.
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