Re: [squid-users] FD_SETSIZE and max open filedescriptors

I'm not sure if anyone else replied to this (been kind of skimming my
mail today)...

There are other ways to address this problem...one of them is to alter
__FD_SETSIZE in /usr/include/bits/types.h to your preferred value (30000
is a bit unnecessarily high...I use 8192 or 16384, even on the biggest
commodity hardware in existence, and never get near the limit).

Chris McDonough wrote:

> Hi folks,
>
> I'm using Squid 2.4-STABLE3 on Linux 2.4.X, and it appears that the only
> way I can convince Squid to start with more than 1024 file descriptors
> (even if bash's ulimit -n reports, for example, 30000 at compilation
> time and runtime -- I'm dead certain that the OS and the shell limits
> are set high enough) is to bruce-force set the number in main.c like so:
>
> *** main.c Tue Dec 25 07:38:51 2001
> --- main-new.c Wed Jan 2 21:26:41 2002
> ***************
> *** 575,580 ****
> --- 575,581 ----
> debug_log = stderr;
> - if (FD_SETSIZE < Squid_MaxFD)
> - Squid_MaxFD = FD_SETSIZE;
> + Squid_MaxFD = 30000;
>
> #if defined(_SQUID_MSWIN_) || defined(_SQUID_CYGWIN_)
> if ((WIN32_init_err = WIN32_Subsystem_Init()))
>
> Note that this diff is against CVS HEAD, but the results are the same
> with 2.4-STABLE3. This works fine, or at least appears to under very
> heavy load.
>
> I don't really want to do this to main.c (for distribution purposes), so
> I've tried instead to force the define of src/squid.h's
> CHANGE_FD_SETSIZE to 1 (despite the dire warning as regards Linux)
> before a compilation but it seems to have no effect. After compiled
> this way (and running in a shell that has 30000 max open fds) Squid
> still starts with 1024 FDs available according to cache.log. Note that
> I *do* see configure report the max number of open filedescriptors as
> 30000 (as opposed to the Linux default of 1024). It also reports
> FD_SETSIZE as 1024.
>
> Has anyone else encountered this problem?
>
> - C

-- 
Joe Cooper <joe@swelltech.com>
http://www.swelltech.com
Web Caching Appliances and Support