Question: ulimit how to set unlimited?
Answer: CPU time (seconds): ulimit -t unlimited.
File size (blocks): ulimit -f unlimited.
Maximum memory size (kbytes): ulimit -m unlimited.
Maximum user processes: ulimit -u unlimited.
Open files: ulimit -n 8192 (minimum value)
Stack size (kbytes): ulimit -s 8192 (minimum value)
Virtual memory (kbytes): ulimit -v unlimited.