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From Res <...@ausics.net>
Subject Re: [users@httpd] FD_SETSIZE
Date Thu, 03 May 2007 23:11:34 GMT
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On Thu, 3 May 2007, Joshua Slive wrote:

> On 5/2/07, Eduardo Meyer <dudu.meyer@gmail.com> wrote:
>> On Apache2, how do I set FD_SETSIZE? I have found some virtual hosts
>> limitations and FAQ and documentation tells I should define FD_SETSIZE
>> in EXTRA_CFLAGS, but where EXTRA_CFLAGS go?
>
> I don't remember for sure, but I don't think that FD_SETSIZE has any
> effect in 2.x. You just need to make sure that your OS has allocated
> the necessary file descriptors to apache before you start.
>
> Joshua.


I've founds you nearly always have to increase the value, this is 
what we use and should be sufficient for machines that do about 2K hosts
each, in apachectl:

ULIMIT_MAX_FILES="ulimit -H -n 16384"

check your logs for errors. you can also (playing it safe)
cd /usr/include
grep -R FD_SETSIZE *
in bits directory edit typesizes.h
and in linux directory posix_types.h

You'll possibly see a few returns all saying 1024, change them to 16384.
if you only have 1K host,s setting these all to 8192 will work just as 
good.

- -- 

Cheers
Res

Vote for your favourite MTA at  http://polls.ausics.net/v3.php
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