Viktor Dukhovni:
> The reasonable response to latency spikes is creating concurrency
> spikes.
By design, Postfix MUST be able to run in a fixed resource budget.
Your on-demand concurrency spikes break this principle and will
result in unexpected resource exhaustion.
If you want to run more processes increase the process limit. Then,
Postfix's resource budget can be validated with smtp-sink/source
like tools.
Recall that the automatic response to smtpd overload was NOT running
more smtpd processes. Instead, the solution was allowing them to
run with shorter timeouts. That approach respects the "fixed budget"
requirement.
Please consider a "stress" like equivalent for delivery agents.
Wietse
