forkbomb is tool for stress testing. It can create many processes using fork(),
allocate memory using realloc() and accesses this memory. It has
different switches for fine-tuning operation. While classic fork() bomb is good
only for fun, running multiple memory-eaters can be useful for determining
maximum memory which can be given to servers (bind or squid) without taking
machine down.  You can test different operation systems with this tool and see
how they are handling the load.

WWW: http://home.worldonline.cz/~cz210552/forkbomb.html