maximum file descriptors not higher than 983

[Alex Rousskov]

On Wed, 2007-12-19 at 10:11 +0100, Marek Lewkowicz wrote:
> Hello Mathias,
> 
> I got the same problem when I played with Polygraph installed on
> Debian4. For older kernel version (2.4) there was some trick to modify
> kernel headers to convince Polygraph for more file descriptors.
> Unfortunately I've found nothing for 2.6 kernels.

Here is what I do for Ubuntu 2.6.15-26-server:

1) Edit /etc/security/limits.conf:
*                soft    nofile          16384
*                hard    nofile          16384

2) If you compile Polygraph on this box, then
edit /usr/include/linux/posix_types.h and /usr/include/bits/typesizes.h
to #define __FD_SETSIZE  as 16384

The above two steps were sufficient for me. I am not a Linux guru though
and YMMV. More information can be found at
http://bcr2.uwaterloo.ca/~brecht/servers/openfiles.html but it may be
outdated in places.

HTH,

Alex.


> Weiersmüller Mathias (KIPO 14) wrote: 
> > I am trying in vain to increase the number of file descriptors that web polygraph uses:
> > 
> > when starting polyctl, I get the following message:
> > 
> > == snip ====
> > 000.01| FDs: 65535 out of 65535 FDs can be used; safeguard limit: 983
> > == snip ====
> > 
> > => Why does the safeguard limit stay at such a low level?
> > 
> > Additional information here:
> > ============================
> > Limits:
> > -------
> > ulimit -n  =>  8192
> > ulimit -Hn => 65535
> > cat /proc/sys/fs/file-max => 205300
> > 
> > System information:
> > -------------------
> > OS: Ubuntu Linux, version: gutsy
> > Kernel: 2.6.22-14-server
> > g++ version: 4.1.3
> > CPU: Dual-Intel Xeon CPU 3.20GHz
> > 
> > polygraph information:
> > ----------------------
> > version: 3.0.6
> > configured: with option: --without_ssl
> > => when running ./configure, these might (?) be the interesting lines:
> >   checking for set_new_handler... no
> >   checking Default FD_SETSIZE value... 1024
> >   checking Maximum number of filedescriptors we can open... 65536
> > 
> > 
> > I am clueless. Are there other parameters to check/change?
> > 
> > Thanks in advance for a hint! 
> > BTW: web polygraph really rocks! Although I had a quick look on the application before, I just realized how powerful the whole suite is!
> > 
> > Regards
> > 
> > Mathias
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