stress --压力测试软件

• stress 命令主要用来模拟系统负载较高时的场景

ubuntu下安装

[e-mail]:apt-get install stress
[e-mail]:apt-get install htop #top的增强版，比较直观
[e-mail]:stress --help
`stress' imposes certain types of compute stress on your system
 
Usage: stress [OPTION [ARG]] ...
 -?, --help         show this help statement
     --version      show version statement
 -v, --verbose      be verbose
 -q, --quiet        be quiet
 -n, --dry-run      show what would have been done
 -t, --timeout N    timeout after N seconds
     --backoff N    wait factor of N microseconds before work starts
 -c, --cpu N        spawn N workers spinning on sqrt()#产生 N 个进程，每个进程都反复不停的计算随机数的平方根
 -i, --io N         spawn N workers spinning on sync()#产生 N 个进程，每个进程反复调用 sync() 将内存上的内容写到硬盘上
 -m, --vm N         spawn N workers spinning on malloc()/free()#产生 N 个进程，每个进程不断分配和释放内存
     --vm-bytes B   malloc B bytes per vm worker (default is 256MB)
     --vm-stride B  touch a byte every B bytes (default is 4096)
     --vm-hang N    sleep N secs before free (default none, 0 is inf)
     --vm-keep      redirty memory instead of freeing and reallocating
 -d, --hdd N        spawn N workers spinning on write()/unlink()# 产生 N 个不断执行 write 和 unlink 函数的进程(创建文件，写入内容，删除文件)
     --hdd-bytes B  write B bytes per hdd worker (default is 1GB)
 
Example: stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10s
 
Note: Numbers may be suffixed with s,m,h,d,y (time) or B,K,M,G (size).

• test
  没有进行测试之前的情况，可以看到6核心的cpu基本处于空负载状态

产生6个进程消耗cpu资源

消耗2*300M 共600M的mem资源