模拟各种负载 cpu 内存 磁盘io 
imposes certain types of compute stress on your system
对系统施加某些类型的计算压力


stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10s

./stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M -d 3 --timeout 100s

--timeout 运行时间 

Note: Numbers may be suffixed with s,m,h,d,y (time) or B,K,M,G (size).

运行起来后 ，用 linux 命令观察
top 
vmstat 2
vmstat -d 2
iostat -x 2
iotop 
ps -ef|grep stress
pstree -p 2690727

sudo iotop -oP
sudo iotop -o


iostat -x 2
Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sda               0.00     0.00    0.00  840.50     0.00 205886.00   489.91   142.48  163.91    0.00  163.91   1.19 100.00

%util


iotop

Total DISK READ :	0.00 B/s | Total DISK WRITE :       2.49 G/s
Actual DISK READ:	0.00 B/s | Actual DISK WRITE:     233.22 M/s

线程各种状态统计
 ps -e -L h o state |sort |uniq -c
      6 D
     17 R
   5733 S






 -?, --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()
 -i, --io N         spawn N workers spinning on sync()
 -m, --vm N         spawn N workers spinning on malloc()/free()
     --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 is none, 0 is inf)
     --vm-keep      redirty memory instead of freeing and reallocating
 -d, --hdd N        spawn N workers spinning on write()/unlink()
     --hdd-bytes B  write B bytes per hdd worker (default is 1GB)
     --hdd-noclean  do not unlink files created by hdd workers

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).





源码下载编译

https://gitee.com/dyyx/hellocode/blob/master/tools/stress.c

https://github.com/jreybert/power/blob/master/tests/stress.c

https://linux.die.net/man/1/stress

gcc stress.c  
对‘sqrt’未定义的引用
gcc stress.c  -o stress  -lm
./stress
`stress' imposes certain types of compute stress on your system

./stress -?
./stress --help




  linux实用命令合集  
  linux运维常用命令