sh-3.2# ulimit -a

core file size          (blocks, -c) 0

data seg size           (kbytes, -d) unlimited

file size               (blocks, -f) unlimited

max locked memory       (kbytes, -l) unlimited

max memory size         (kbytes, -m) unlimited

open files                      (-n) 1024

pipe size            (512 bytes, -p) 1

stack size              (kbytes, -s) 8192

cpu time               (seconds, -t) unlimited

max user processes              (-u) 1064

virtual memory          (kbytes, -v) unlimited

sh-3.2# ulimit -n 1048576

ulimit: open files: cannot modify limit: Invalid argument

sh-3.2# sysctl -w kern.maxfiles=1048600

kern.maxfiles: 12288 -> 1048600

sh-3.2# sysctl -w kern.maxfilesperproc=1048576

kern.maxfilesperproc: 10240 -> 1048576

sh-3.2# ulimit -n 1048576

sh-3.2# ulimit -n

1048576