Calculate CPU affinity for NGINX

nginx_worker_cpu_affinity_calc.sh

#!/bin/bash
conf=/etc/nginx/workerprocesses.conf
cpu=$(awk '/^processor/{n=$3} END{print n}' /proc/cpuinfo 2> /dev/null || echo 0)
[[ ${2:-0} -gt 0 ]] && cpu=$(($2 - 1))

workers=$1
if [[ "$workers" = "" ]] || [[ ${workers:-0} -le 0 ]];then
	workers=$(( cpu * 75 /100 ))
	[[ ${workers:-0} -le 0 ]] && exit
fi
# cpu=30
# [[ $cpu -eq 0 ]] && exit;
n=$cpu

if [ $workers -gt $cpu ];then
	echo "# Number of workers $workers is great $n"
	exit
fi
start=$((cpu - workers ))

calculate_workers(){
	echo "worker_processes $workers;" 

    printf "worker_cpu_affinity " 

    for a in $( seq $start $cpu ); do
    	poss=$((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
    	[ $cpu != $a ] && echo -n " " || echo ";" 
    done

}

[[ -f "${conf}" ]] &&  calculate_workers > $conf || calculate_workers