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ulimit.md

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ulimit

SYNOPSIS

ulimit [-HSTabcdefilmnpqrstuvx [limit]]

DESCRIPTION

Provides control over the resources available to the shell and to processes started by it, on systems that allow such control.

OPTIONS

  • -a
    • All current limits are reported
  • -b
    • The maximum socket buffer size
  • -c
    • The maximum size of core files created
  • -d
    • The maximum size of a process's data segment
  • -e *The maximum scheduling priority ("nice")
  • -f
    • The maximum size of files written by the shell and its children
  • -i
    • The maximum number of pending signals
  • -l
    • The maximum size that may be locked into memory
  • -m
    • The maximum resident set size (many systems do not honor this limit) -n The maximum number of open file descriptors (most systems do not allow this value to be set) -p The pipe size in 512-byte blocks (this may not be set)
  • -q
    • The maximum number of bytes in POSIX message queues
  • -r
    • The maximum real-time scheduling priority
  • -s
    • The maximum stack size
  • -t
    • The maximum amount of cpu time in seconds
  • -u
    • The maximum number of processes available to a single user
  • -v
    • The maximum amount of virtual memory available to the shell and, on some systems, to its children -x The maximum number of file locks
  • -T
    • The maximum number of threads
[username@hostname~]$ ulimit -a
core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 111795
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 65536
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 16384
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
[username@hostname ~]$