[stunnel-users] FD_SETSIZE and file ulimit

Arunkumar Arumugam aarumuga at gmail.com
Wed Nov 8 12:24:07 CET 2006

Hi Guys -

   I have a stunnel setup in a linux box kernel 2.4 Advanced sever release
2.1AS (pensacola) . I am trying to increase the number of file descriptors
with which stunnel could handle.  So I did a ulimit -n 4096  for root and
restarted the  stunnel process.

 Now in the stunnel logs i see,
 ..... FD_SETSIZE=1024, file ulimit=4096- > 500 clients allowed.

I dont completely understand the  relation between  FD_SETSIZE and file
ulimit.   I also read that a single stunnel connection might use around 2 or
3 file descriptors.

So what is the cap on the number of file descriptors used by stunnel. To
make it use , around 4096 file descriptors should i recompile the stunnel
again with FD_SETSIZE set to 4096.?

Galbraith's Law of Human Nature: Faced with the choice between changing
ones' mind and proving that there is no need to do so, almost everybody gets
busy on the proof.
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