Hi edan! Thanks for your reply. The thread implementation had changed, but not that dramatically - each thread has its pid and has a directory in /proc, so I was hoping that this module will still function (in vain). It seems that there is a group_id for each thread that equals the pid of the thread that created it. It is interesting that ps for example can give all the threads when it is used with the -m flag. I guess it is not that hard to count it myself using the /proc data, but I don't feel like it :) The kernel version we are using here is 2.4.21-4.ELsmp Thanks again for your help! yuvalle1