If postfix alone is running on the server, let's say as a mail router or backend delivey system, would postfix processes make use of all cores? would I be left with cores doing nothing even If I have an important number of emails to process?
On Mon, Jan 17, 2011 at 7:02 AM, Victor Duchovni <victor.ducho...@morganstanley.com> wrote: > On Mon, Jan 17, 2011 at 06:55:39AM +0200, Jaques Cochet wrote: > >> Does increasing the number of cores on the same hardware platform add >> performance to a Postfix system or it is better to run several Postfix >> systems on different machines? > > Yes, but only if the CPU is the bottleneck. Typically this happens when > you use CPU-intensive Anti-Virus or Anti-Spam content filters or milters. > > Multiple messages will be scanned in parallel, and additional concurrency > will help, provided the disk or network is not bottleneck. > > >> If the second choice is better, is it >> logical to run Postfix on different VMs (using ESX for example), >> let's say on something like 12 cores? > > VMs will just make your life worse. Only needed if you need different > O/S versions for the various software components, but be prepared for > pain with timing and subtle resource allocation issues. > >> I will use Postfix for email >> scanning (using Mail scanner) and relay and also for mail delivery. > > Don't use "Mailscanner". There are other A/V scanners out there that > are not incompatible with Postfix, Mailscanner is not one of them, > unless its architecture has substantially changed recently. > > -- > Viktor. > -- Jaques ..
