#!/bin/bash #gino #20150711 CPULOG_1=`cat /proc/stat | head -n1 | awk '{print $2" "$3" "$4" "$5" "$6" "$7" "$8}'` SYS_IDLE_1=`echo $CPULOG_1 | awk '{print $4}'` Total_1=`echo $CPULOG_1 | awk '{print $1+$2+$3+$4+$5+$6+$7}'` sleep 1 CPULOG_2=`cat /proc/stat | head -n1 | awk '{print $2" "$3" "$4" "$5" "$6" "$7" "$8}'` SYS_IDLE_2=`echo $CPULOG_2 | awk '{print $4}'` Total_2=`echo $CPULOG_2 | awk '{print $1+$2+$3+$4+$5+$6+$7}'` Total=`expr $Total_2 - $Total_1` SYS_IDLE=`expr $SYS_IDLE_2 - $SYS_IDLE_1` SYS_USAGE=`echo $SYS_IDLE/$Total*100 |bc -l` SYS_Rate=`echo 100-$SYS_USAGE |bc -l` Disp_SYS_Rate=`expr "scale=2; $SYS_Rate/1" |bc` printf "%4.2f%%\n" ${Disp_SYS_Rate}
总结：
总CPU使用率的计算公式
CPU时间=user+system+nice+idle+iowait+irq+softirq+steal CPU时间片=CPU_2 - CPU_1 IDLE时间=idle_2 - idle_1 CPU总的使用率=100*（CPU时间片-IDLE时间）/CPU时间片
