Saber los límites que impone el SO a un proceso determinado:
cat /proc/[num proc]/limits
Ejemplo:
juanma@ubuntu:~$ cat /proc/3474/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes ...