您需要从中解析出数据
/proc/<PID>/stat。这些是前几个字段（来自
documentation/filesystems/proc.txt内核源代码）：
Table 1-3: Contents of the stat files (as of 2.6.22-rc3).............................................................................. Field Content pidprocess id tcomm filename of the executable state state (R is running, S is sleeping, D is sleeping in an uninterruptible wait, Z is zombie, T is traced or stopped) ppid process id of the parent process pgrp pgrp of the process sidsession id tty_nr tty the process uses tty_pgrp pgrp of the tty flags task flags min_flt number of minor faults cmin_flt number of minor faults with child's maj_flt number of major faults cmaj_flt number of major faults with child's utime user mode jiffies stime kernel mode jiffies cutime user mode jiffies with child's cstime kernel mode jiffies with child's
您可能在
utime和/或之后
stime。您还需要从中读取
cpu行
/proc/stat，如下所示：
cpu 192369 7119 480152 122044337 14142 9937 26747 0 0
这将告诉您已在各种类别中以累计量为单位使用的累计CPU时间。您需要对这条线上的值求和才能得到
time_total度量。
同时读取
utime并
stime进行过程中，你有兴趣，并阅读
time_total来自
/proc/stat。然后睡一秒钟左右，然后再次阅读它们。现在，您可以使用以下命令计算采样时间内该进程的CPU使用率：
user_util = 100 * (utime_after - utime_before) / (time_total_after - time_total_before);sys_util = 100 * (stime_after - stime_before) / (time_total_after - time_total_before);
合理？
