stress 是Unix类系统下的工作量和压力测试工具。它将对用户指定的CPU数量的I/O，内存和硬盘的负载并报告它检测到任何错误。它用于自动压力测试和调试系统组件失败的唯一或更经常负荷时。它可以运行在x86，ppc64的，和PPC 32 GNU / Linux的，Tru64的，SPARC Solaris的，和其他平台。

使用示例：

   $ 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)