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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：pstree可以看到：
nmon可以看到：
具体使用可以参考man stress！
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