Pressure Measurement and server monitoring tools

We must first of its profits; always want to run a variety of applications, you can use server monitoring tool to see how their server status in the server above; if you need to learn how server performance, you need to measure pressure tool;

• View server CPU core usage:top
• View server memory usage: free -m
• View server disk IO usage:iotop
• Check the server disk usage:df -h
• View server network IO usage:iftop
• Upgraded version of the top command: htop

Pressure measurement

• Tools for different types of server resources will be more pressure measured; they will just write use;
• CPU Stress Test:

  # 使用lookbusy
  ./lookbusy -h   # 打印帮助信息
  ./lookbusy --n=4 --cpu-util=80 --mem-util=4096MB    # 将4个逻辑核的使用率变为80%，内存使用4096MB
  

• Memory Stress Test:

  # 使用stress-ng
  # 下载与安装stress-ng
  wget http://kernel.ubuntu.com/~cking/tarballs/stress-ng/stress-ng-0.08.01.tar.gz
  tar -xvf stress-ng-0.08.01.tar.gz
  cd stress-ng-0.08.01
  make && make install
  # help
  stress-ng --help
  #在4个CPU逻辑核上面产生80%的负载（不耗用内存利用率）：
  stress-ng --cpu 4 --cpu-load 80
  #在4个CPU逻辑核上面产生20%的负载，并使用两个进程总共占用1024MB内存：
  stress-ng --cpu 4 --cpu-load 20 --vm 2 --vm-bytes 1024M #此时可以查看系统的CPU使用率，发现约为70%左右，因为在分配并耗费内存资源的时候，两个进程对两个CPU逻辑核的利用率是100%，因此：综合利用率是100%*0.5+20%=70%
  

• Disk IO performance testing tools: fio, dd, iozone
• Network bandwidth testing tools: Use netperf communications network between two machine performance testing
  • netperf comprising two components:
    • Client netperf
    • netserver

      #物理机上测试，在服务器端和客户端安装程序
      wget https://github.com/HewlettPackard/netperf/archive/netperf-2.7.0.tar.gz
      tar -xvf netperf-2.7.0.tar.gz
      cd netperf-netperf-2.7.0/
      ./configure && make && make install
      # 安装完成
      # 在服务器端运行：
      netserver
      # 在客户端运行
      netperf -H $ip -l 60 -t TCP_STREAM  # ip是服务器端的ip地址
      

reference

stress-ng
grasp of Linux PC performance benchmark tests
using NETPERF test network performance
network testing tool installation Netperf

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Original: Big Box  server Pressure Measurement and Monitoring Tools