Too many open files (not only BIND 9.5.0-P1)

[JINMEI Tatuya / 神明達哉]

At 09 Jul 2008 21:44:47 +0100,
Chris Thompson <cet1 at hermes.cam.ac.uk> wrote:
 
> I have observed two occurrences of this with BIND 9.4.2-P1 running under 
> Solaris 10_x86 even though plimit(1) clearly shows the named process 
> has both soft and hard limits on file descriptors set to 65536:
> 
> Jul  9 20:29:09 recdns0.csx.cam.ac.uk named[18018]: [ID 873579 local7.error] 
>  general: error: socket: too many open file descriptors
> Jul  9 20:29:25 recdns0.csx.cam.ac.uk last message repeated 758 times
> 
> # plimit 18018
> 18018:  /usr/local/BIND/bind/sbin/named -u namesrvr -c ../etc/named.conf
>    resource              current         maximum
> [...]
>   nofiles(descriptors)  65536           65536

What's the value of FD_SETSIZE?  Someone else reported that there's a
system that has FD_SETSIZE defaulting to 256.

I'd also like to know that how many sockets were actually opened when
you saw the 'too many open file descriptors' errors.

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JINMEI, Tatuya