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| 系统监控:(CPU)
URL:http://www.cnblogs.com/yjf512/p/3383915.html
Cpu(s)表示的是cpu信息。各个值的意思是：
us: user cpu time (or) % CPU time spent in user space
sy: system cpu time (or) % CPU time spent in kernel space
ni: user nice cpu time (or) % CPU time spent on low priority processes
id: idle cpu time (or) % CPU time spent idle
wa: io wait cpu time (or) % CPU time spent in wait (on disk)
hi: hardware irq (or) % CPU time spent servicing/handling hardware interrupts
si: software irq (or) % CPU time spent servicing/handling software interrupts
st: steal time - - % CPU time in involuntary wait by virtual cpu while hypervisor is servicing another processor (or) % CPU time stolen from a virtual machine
us：用户态使用的cpu时间比
sy：系统态使用的cpu时间比
ni：用做nice加权的进程分配的用户态cpu时间比
id：空闲的cpu时间比
wa：cpu等待磁盘写入完成时间
hi：硬中断消耗时间
si：软中断消耗时间
st：虚拟机偷取时间
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