Author: Lena Date: To: exim-users Subject: Re: [exim] Need help clarifying Exim performance changes I am
suggesting to dedicated server host to prevent load spikes
> From: "Justin Fossey"
> the load spikes seem to coincide with a spike in the
> number of Exim process. Normally there would be between 1-5 Exim process running and load will be
> low. Then the load spikes there would be between 10-50 Exim processes and then the load would jump
> to 10-90. This would last for a few min at most 5-8min and then drop quickly and load and
> responsiveness would normalize.
>
> My requested changes based on my reading of the Docs are the following.
>
> remote_max_parallel = 1
> queue_smtp_domains = *
>
> My understanding is that this should reduce the number of process started for remote deliveries and
> should mitigate these spikes by preventing immediate delivery for remote SMTP hosts.
>
> Maybe later if needed, I might consider reducing queue_run_max.
Consider also (or instead):
begin transports
remote_smtp:
driver = smtp
serialize_hosts = *
