查找进程cpu占用率

则设总CPU运行时间为total = usr + nice + sys + idle + irq +sirq。 在一定时间间隔下两次读取文件，依次得到前后两次的处理器运行时间为usr1, nice1, sys1, idle1, wio1, irq1, sirq1与usr2, nice2, sys2, idle2, wio2, irq2, sirq2，则总时间为： total1 = usr1 + nice1 + sys1 + idle1 + wio1 + irq1 + sirq1 total2 = usr2 + nice2 + sys2 + idle2 + wio2 + irq2 + sirq2 间隔时间为itv = total2-total1，则有 u sr_ratio = (usr2-usr1)/itv (同2.4.x kernel) nice_ratio = (nice2-nice1)/itv (同2.4.x kernel) sys_ratio = (sys2-sys1 + irq2-irq1 + sirq2-sirq1)/itv idle_ratio = (idle2-idle1)/itv (同2.4.x kernel) wio_ratio = (wio2-wio1)/itv (同2.4.x kernel) sr_ratio = (usr2-usr1)/itv (同2.4.x kernel) nice_ratio = (nice2-nice1)/itv (同2.4.x kernel) sys_ratio = (sys2-sys1 + irq2-irq1 + sirq2-sirq1)/itv idle_ratio = (idle2-idle1)/itv (同2.4.x kernel) wio_ratio = (wio2-wio1)/itv (同2.4.x kernel)