cpu统计时间疑问。。。。
本帖最后由 chishanmingshen 于 2014-12-01 15:41 编辑cat /proc/pid/stat:
cutime=0 累计的该任务的所有的waited-for进程曾经在用户态运行的时间，单位为jiffies
cstime=0 累计的该任务的所有的waited-for进程曾经在核心态运行的时间，单位为jiffies
里面2个字段，网上描述如上，但是不懂。。。请指点，谢谢！
请指点，谢谢！ 回复 1# chishanmingshen
(14) utime%lu
Amount of time that this process has been scheduled
in user mode, measured in clock ticks (divide by
sysconf(_SC_CLK_TCK)).This includes guest time,
guest_time (time spent running a virtual CPU, see
below), so that applications that are not aware of
the guest time field do not lose that time from
their calculations.
(15) stime%lu
Amount of time that this process has been scheduled
in kernel mode, measured in clock ticks (divide by
sysconf(_SC_CLK_TCK)).
(16) cutime%ld
Amount of time that this process's waited-for
children have been scheduled in user mode, measured
in clock ticks (divide by sysconf(_SC_CLK_TCK)).
(See also times(2).)This includes guest time,
cguest_time (time spent running a virtual CPU, see
below).
(17) cstime%ld
Amount of time that this process's waited-for
children have been scheduled in kernel mode,
measured in clock ticks (divide by
sysconf(_SC_CLK_TCK)).
就是被wait for的子进程所花掉的用户态时间和内核态时间呀。和utime、stime的差别是，前者记录的是小孩的，后者记录的是自己的。 waited-for children 应该是指我们在父进程调用wait 函数所等待的子进程的意思（见下面的man说明）。
cutime不仅仅出现在proc接口里，更重要的也是times系统调用的输出（http://linux.die.net/man/2/times）， 为什么要提times？估计你用过time吧（http://linux.die.net/man/1/time）。很经典的一个命令，估计cutime是为它而生的。
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