From: Andreas Grimm (grimm.andreasyahoo.com)
Date: Tue Oct 30 2007 - 10:36:21 CDT

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Hello Wietse,

the problem is that, as far as i know, /proc/sys/fs/file-max limits the total open files for all processes. The open files per process is limited in the shown kernel headers. I think the problem is anvil. Every smptd process has a connection to anvil, and every connection is a file. Because of the per process limit anvil, which is a single process, stops the service. So /proc/sys/fs/file-max won't help here. Is there a way to turn off anvil in such stress situations (i.e. when there are more than 800 connections)? It might help.
BTW:
I'm using Suse Linux Enterprise Server. The file-max limit is set to 1575439.

Andreas

Wietse Venema <wietseporcupine.org> wrote: Andreas Grimm:
> Hello postfix-users,
>
> maybe a short note for the linux users, because even after i
> applied the stress tips from Wietse, the server was slow. So i
> tried to run more processes and experienced problems running more
> than 900 simultaneously processes of smptd. I saw something like
....
[edit include/linux/fs.h, include/linux/limits.h, recompile kernel]

Are you sure this could not be achieved with sysctl commands, or
with "echo something >/proc/mumble"? See also the hints and tips
in http://www.postfix.org/TUNING_README.html#file_limit

The information in that file may be outdated, especially with
respect to echoing stuff intro /proc. Updates are welcome.

 Wietse

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