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这本书介绍了非常多的调试手段和工具， 其中提到了stress这个简单的工具，在我们的日常工作中很有用。利用它可以给我们的系统施加CPU，内存,IO和磁盘的压力，在模拟极端场景给应用系统造成的压力方面很有帮助。

主页见：http://weather.ou.edu/~apw/projects/stress/

stress is a deliberately simple workload generator for POSIX systems. It imposes a configurable amount of CPU, memory, I/O, and disk stress on the system. It is written in C, and is free software licensed under the GPLv2.

这个stress实现非常的简单，所有的功能在一个.c文件里面实现， 系统运行的时候会fork多个子进程，分别进行CPU,内存，IO方面的折磨。

因为简单所以稳定。参考例子：

$ stress –cpu 2 –io 1 –vm 1 –vm-bytes 128M –timeout 10s –verbose

stress: info: [9372] dispatching hogs: 2 cpu, 1 io, 1 vm, 0 hdd

stress: dbug: [9372] (243) using backoff sleep of 12000us

stress: dbug: [9372] (262) setting timeout to 10s

stress: dbug: [9372] (285) –> hogcpu worker 9373 forked

stress: dbug: [9372] (305) –> hogio worker 9374 forked

stress: dbug: [9372] (325) –> hogvm worker 9375 forked

stress: dbug: [9372] (243) using backoff sleep of 3000us

stress: dbug: [9372] (262) setting timeout to 10s

stress: dbug: [9372] (285) –> hogcpu worker 9376 forked

stress: dbug: [9375] (466) hogvm worker malloced 134217728 bytes

stress: dbug: [9372] (382) <-- worker 9374 signalled normally

stress: dbug: [9372] (382) <-- worker 9373 signalled normally

stress: dbug: [9372] (382) <-- worker 9375 signalled normally

stress: dbug: [9372] (382) <-- worker 9376 signalled normally

stress: info: [9372] successful run completed in 10s

由于stress支持posix平台，简单的下载，编译和安装就好了, 很顺利！

按照文档默认的运行参数，让系统来点体验：

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

stress: info: [23176] dispatching hogs: 8 cpu, 4 io, 2 vm, 0 hdd

pstree可以看到：

nmon可以看到：

具体使用可以参考man stress！