ApacheのMPMの設定において、MaxClientsに設定できる上限値を計算するシェルスクリプト

get_max_clients.sh

#!/bin/bash

_PIDS=(`pgrep httpd`)
_PROC_COUNT=${#_PIDS[@]}

_MEMORY_TOTAL=`free | grep Mem | awk '{print $2;};'`
#_MEMORY_FREE=`vmstat -a | awk 'NR==3{print $4+$5;};'`
_RSS_TOTAL=0
_SHARED_TOTAL=0

for _PID in ${_PIDS[@]}; do
    _SMAPS=`cat /proc/$_PID/smaps`
    _RSS=`echo "$_SMAPS" | grep Rss | awk '{value += $2} END {print value;};'`
    _SHARED=`echo "$_SMAPS" | grep Shared | awk '{value += $2} END {print value;};'`
    _RSS_TOTAL=`expr $_RSS_TOTAL + $_RSS`
    _SHARED_TOTAL=`expr $_SHARED_TOTAL + $_SHARED`
done

_RSS_AVERAGE=`expr $_RSS_TOTAL / $_PROC_COUNT`
_SHARED_AVERAGE=`expr $_SHARED_TOTAL / $_PROC_COUNT`
_PROC_MEMORY=`expr $_RSS_AVERAGE - $_SHARED_AVERAGE`
#_MIN_MAX_CLIENTS=`expr $_MEMORY_FREE / $_PROC_MEMORY`
_MAX_MAX_CLIENTS=`expr $_MEMORY_TOTAL / $_PROC_MEMORY`

echo "Memory Total / (Rss Average - Shr Average) = $_MEMORY_TOTAL / ($_RSS_AVERAGE - $_SHARED_AVERAGE)"
#echo "Memory Free  / (Rss Average - Shr Average) = $_MEMORY_FREE / ($_RSS_AVERAGE - $_SHARED_AVERAGE)"
#echo "MaxClients = $_MIN_MAX_CLIENTS ~ $_MAX_MAX_CLIENTS"
echo "MaxClients = $_MAX_MAX_CLIENTS"

exit 0

2011-05-19 22:49
Apacheチューニング: MaxClientsに設定できる上限値を計算する - (DxD)∞