watch-cgroup-memory-usage

watch-cgroup-memory-usage

#!/bin/bash
#
# watch cgroup 'browsers' memory activity
#
# best served with ...
#
# https://gist.github.com/jakewarren/477ecd1149abe908cbd5cf7a7c9abaa3

self=$0
SUDO=
uid=$(id -u)
[ $uid = 0 ] || SUDO=sudo

CGROUP=browsers

die() { echo >&2 "$@" ; exit 1 ; }

do_single() {
   local cgroup=$1
   cd /sys/fs/cgroup/memory/$cgroup/ 
   echo "[memory/$cgroup]"
   grep . memory.{usage_in_bytes,max_usage_in_bytes,soft_limit_in_bytes,limit_in_bytes,failcnt} | column -t -s:
   echo
   cd /sys/fs/cgroup/cpu/$cgroup/ 
   echo "[cpu/$cgroup]"
   grep . cpu.{cfs_period_us,cfs_quota_us} | column -t -s:
   cat cpu.stat | column -t
}
do_watch() {
   $SUDO watch -n1 -d $self --group "$CGROUP" --single
}

do_help() {
   cat <<END
${self#*/} ...

 -h --help                      this help
 -g --group <name>              cgroup to use (default is browsers)
 -w --watch                     watch mode
 -1 --single                    show once, exit

END
   exit 0
}

if [[ "${#@}" == 0 ]] ; then
   do_watch
   exit 0
fi

while [[ "${1:0:1}" == '-' ]] ; do
   cmd=$1 ; shift
   case $cmd in
      -h|--help) do_help;;
      -g|--group) CGROUP=$1 ; shift ;;
      -w|--watch) do_watch;;
      -1|--single) do_single $CGROUP;;
      -*) die "unknown option $cmd"
   esac
done