Nginx worker_cpu_affinity

nginx-affinity.sh

#!/bin/bash
#
# @file: nginx-affinity.sh
# @brief:
# @author: YoungJoo.Kim <http://vozlt.com>
# @version:
# @date:
#
# Linux only.
# Nginx worker_cpu_affinity
# http://wiki.nginx.org/CoreModule

n=$(awk '/^processor/{n=$3} END{print n}' /proc/cpuinfo)
aff=$(printf "0%0${n}d" 0)
printf "worker_processes %d;\n" $((n+1))
[ $n -eq 0 ] && exit;
printf "worker_cpu_affinity "
for ((a=0; a <= n; a++))
do
    poss=$((n - a))
    pose=$((n - poss))
    if [ $pose -eq 0 ]; then
        printf "%0${poss}d1" 0
    elif [ $poss -eq 0 ]; then
        [ $poss -eq 0 ] && printf "1%0${pose}d" 0
    else
        [ $pose -ne 0 ] && printf "%0${poss}d1%0${pose}d" 0 0
    fi

    [ $n != $a ] && echo -n " " || echo ";";
done