From: Andreas Grimm (grimm.andreasyahoo.com)
Date: Tue Oct 30 2007 - 11:03:55 CDT

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Hello Victor,

glibc version is 2.4
Kernel version 2.6.16
I think epoll is supported. How can i verify the postfix was compiled with epoll, resp. how can i compile postfix using epoll?
I' using postfix-2.5-20071006.

Victor Duchovni <Victor.DuchovniMorganStanley.com> wrote: On Tue, Oct 30, 2007 at 08:36:21AM -0700, Andreas Grimm wrote:

> 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:

Anvil helps reduce stress, so turning it off is not optimal. If you are
using Postfix 2.4 build on a system with a 2.6 kernel and a suitable
glibc, you have epoll() support, and anvil should easily handle more
than 1024 descriptors.

--
 Viktor.

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