cache和buffer的区别

内在中cache和buffer的区别

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Cache和buffer的区别！

#!/bin/bash

if [[ $# -eq 0 ]]

then

# Define Variable reset_terminal

#字体颜色

#深绿

fontColor='\E[36m'

#黄色

font2Color='\E[33m'

#闪烁

hostnameColor='\E[34m'

hostnameAction='\E[5m'

#绿色

successFulColor='\E[32m'

#红色

failColor='\E[31m'

#使用终端的默认颜色 白色

reset=$(tput sgr0)

# Check OS Type

os=$(uname -o)

echo -e $fontColor "Operating System Type :" $reset $os

# Check OS Release Version and Name

relVersionName=$(cat /etc/centos-release) 

echo -e $fontColor  "OS Release Version and Name :" $reset $relVersionName

# Check Architecture CPU 的架构

arc=$(uname -m)

# 操作系统位数

osBit=$(getconf LONG_BIT)

echo -e $fontColor  "Architecture :" $reset $arc'_'$osBit

# Check Kernel Release

kernelRel=$(uname -r)

echo -e $fontColor "Kernel Release :" $reset $kernelRel

# Check hostname

# hostname=$(hostname)

# hostname=$($HOSTNAME)

hostname=$(uname -n)

echo -e $fontColor  "HostName :" $hostnameAction $hostnameColor $hostname $reset

# Check Internal IP

iip=$(hostname -I) 

echo -e $fontColor "Internal IP :"  $font2Color  $iip $reset

# Check External IP

eip=$(curl -s http://ipecho.net/plain)

echo -e $fontColor "External IP :"  $font2Color  $eip $reset

# Check DNS

# nameservers=$(awk '/nameserver/{print $2}' /etc/resolv.conf)

nameservers=$(cat /etc/resolv.conf | grep -E "\<nameserver[ ]+"| awk '{print $NF}')

echo -e $fontColor "NameServers  :" $font2Color $nameservers $reset

# Check if connected to Internet or not

ping -c 3  www.baidu.com &>/dev/null && echo -e $fontColor "Connect Status: " $successFulColor "Connected" || echo -e $fontColor "Connect Status: " $failColor "Disconnected"

# Check Logined In Users

who>/tmp/who

echo -e $fontColor "Logined In Users :"$reset && cat /tmp/who

rm -f /tmp/who

#系统内存的使用情况

system_memory_usages=$(awk '/MemTotal/{total=$2}/MemFree/{free=$2}END{print (total-free)/1024}' /proc/meminfo)

echo -e $fontColor "System Memuserages :  "$reset $system_memory_usages "M"

#应用内存的使用情况

apps_memory_usages=$(awk '/MemTotal/{total=$2}/MemFree/{free=$2}/Buffers/{buffers=$2}/^Cached/{cached=$2}END{print (total-free-buffers-cached)/1024}' /proc/meminfo)

echo -e $fontColor "Apps Memuserages : "$reset $apps_memory_usages "M"

# CPU 负载情况

#loadaverge=$(top -n 1 -b | grep "load average:" | awk '{print $10 $11 $12}')

#loadaverge=$(w | grep "load average:"| awk 'BEGIN{FS="average:"}{print $2}')

loadaverge=$(w | grep 'load average' | awk '{print $8 $9 $10}')

echo -e $fontColor "Load Averge : "$reset $loadaverge

# CPU 温度

temp=$(cat /sys/class/thermal/thermal_zone0/temp)

rpi_temp=$(echo "$temp 1000" | awk '{print $1/$2}')

echo -e $fontColor "CPU Temperature : "$reset $rpi_temp "℃"

# 磁盘的使用情况

#disk_usages=$(df -h | grep -vE '文件系统|tmpfs'|awk "{print $1 $2 $4 $3 $5}")

df -hP | grep -vE 'tmpfs'>/tmp/disk_usages

echo -e $fontColor "Disk Usages : "$reset && cat /tmp/disk_usages

rm -f /tmp/disk_usages

fi

分析操作系统内存

应用使用内存=Total-(Free+Cached+Buffers)
系统使用内存Used=Total-Free
cache buffer区别
cache：
功能：缓存主要用于打开的文件
读取策略：最少使用原则（LRU）
buffer:
功能：分缓存主要用于目录项、inode等文件系
读取策略：先进先出策略

#!/bin/bash
clear
if [[ $# -eq 0 ]];then
# define variable reset_terminal
reset_terminal=$(tput sgr0)

# check os type
os=$(uname -o)
echo -e '\e[32m'"os type:" $reset_terminal $os
# check os release version and name
os_name=$(cat /etc/issue | grep -e "Server")
echo -e '\e[32m'"os release version" $reset_terminal $os_name
# check architecture
architecture=$(uname -m)
echo -e '\e[32m'"architecture:" $reset_terminal  $architecture
# check kernel release
kernel_release=$(uname -r)
echo -e '\e[32m'"kernel release:" $reset_terminal $kernel_release 
# check hostname
hostname=$HOSTNAME
echo -e '\e[32m'"hostname:" $reset_terminal $hostname
# check inter ip
inter_ip=$(hostname -I)
echo -e '\e[32m'"inter ip:" $reset_terminal $inter_ip
# check dns
dns_addr=$(cat /etc/resolv.conf | grep -E "\<nameserver[ ]+" | awk '{print $NF}')
echo -e '\e[32m'"dns:" $reset_terminal $dns_addr
fi

#!/bin/bash
clear
if [[ $# -eq 0 ]];then
# define variable reset_terminal
reset_terminal=$(tput sgr0) 
# check os type
os=$(uname -o)
# check os release version and name
os_name=$(cat /etc/issue | grep -e "Server")
# check architecture
architecture=$(uname -m)
# check kernel release
kernel_release=$(uname -r)
# check hostname
hostname=$HOSTNAME
# check inter ip
inter_ip=$(hostname -I)
# check dns
dns_addr=$(cat /etc/resolv.conf | grep -E "\<nameserver[ ]+" | awk '{print $NF}')
fi

#!/bin/bash
clear
if [[ $# -eq 0 ]];
then
# define variable reset_terminal
reset_terminal=$(tput sgr0)

# check os type
os=$(uname -o)
# check os release version and name
os_name=$(cat /etc/issue | grep -e "Server")
# check architecture
architecture=$(uname -m)
# check kernel release
kernel_release=$(uname -r)
# check hostname
hostname=$HOSTNAME

系统磁盘信息

CPU负载概念

系统信息——分析系统的运行状态

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