Linux下CPU获取指定时间的用户态、系统态以及空闲态的时间

来源：互联网发布：淘宝售后运费谁承担编辑：程序博客网时间：2024/06/04 17:50

实验原理：通过/proc/stat 获取CPU时间，在Linux的内核中，有一个全局变量：Jiffies。 Jiffies代表时间。它的单位随硬件平台的不同而不同。系统里定义了一个常数HZ，代表每秒种最小时间间隔的数目。这样jiffies的单位就是 1/HZ。每个CPU时间片，Jiffies都要加1。通过sleep延迟，两次获取cpu时间，通过各个时间做差值，从而得出CPU处在各个状态的时间。

#!/bin/shCPULOG_1=$(cat /proc/stat | grep 'cpu ' | awk '{print $2" "$3" "$4" "$5" "$6" "$7" "$8}')USR1=$(echo $CPULOG_1 | awk '{print $2}')NICE1=$(echo $CPULOG_1 | awk '{print $3}')SYS_IDLE_1=$(echo $CPULOG_1 | awk '{print $4}')IDLE1=$(echo $CPULOG_1 | awk '{print $5}')IOWAIT1=$(echo $CPULOG_1 | awk '{print $6}')IRQ1=$(echo $CPULOG_1 | awk '{print $7}')SOFTIRQ1=$(echo $CPULOG_1 | awk '{print $8}')Total_1=$(echo $CPULOG_1 | awk '{print $2+$3+$4+$5+$6+$7+$8}')Free1=$(echo $CPULOG_1 | awk '{print $3+$5+$6+$7+$8}')sleep 20 CPULOG_2=$(cat /proc/stat | grep 'cpu ' | awk '{print $2" "$3" "$4" "$5" "$6" "$7" "$8}')USR2=$(echo $CPULOG_2 | awk '{print $2}')NICE2=$(echo $CPULOG_2 | awk '{print $3}')SYS_IDLE_2=$(echo $CPULOG_2 | awk '{print $4}')IDLE2=$(echo $CPULOG_2 | awk '{print $5}')IOWAIT2=$(echo $CPULOG_2 | awk '{print $6}')IRQ2=$(echo $CPULOG_2 | awk '{print $7}')SOFTIRQ2=$(echo $CPULOG_2 | awk '{print $8}')Total_2=$(echo $CPULOG_2 | awk '{print $2+$3+$4+$5+$6+$7+$8}')Free2=$(echo $CPULOG_2 | awk '{print $3+$5+$6+$7+$8}') USR=`expr $USR2-$USR1|bc`NICE=`expr $NICE2-$NICE1|bc`SYS_IDLE=`expr $SYS_IDLE_2 - $SYS_IDLE_1|bc`IDLE=`expr $IDLE2-$IDLE1|bc`IOWAIT=`expr $IOWAIT2-$IOWAIT1|bc`IRQ=`expr $IRQ2-$IRQ1|bc`SIRQ=`expr $SOFTIRQ2-$SOFTIRQ1|bc`Total=`expr $Total_2 - $Total_1|bc`Free=`expr $Free2-$Free1|bc`echo $USR userecho $NICE nice_echo $SYS_IDLE sysecho $IDLE idleecho $IOWAIT iowaitecho $IRQ irqecho $SIRQ sirq echo $Total allecho $Free free_

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