当我在 Linux 机器上执行 ps -ef 时,我得到: UID PID PPID C STIME TTY TIME CMD
请帮我解释一下C,TIME 的含义。 TIME 是分配给进程的实际CPU 时间吗?
答案1
如果您运行man ps
然后输入/SpaceShift+CSpaceEnter,您应该看到这一行。
C pcpu cpu utilization
但这是在OBSOLETE SORT KEYS
标题下,所以不是我们要找的。
按n
查找下一个匹配项:
c C processor utilization. Currently, this is the
integer value of the percent usage over the
lifetime of the process.
(see %cpu).
听起来不错。欲了解更多详情,我们搜索%cpu
并找到:
%cpu %CPU cpu utilization of the process in "##.#" format.
Currently, it is the CPU time used divided by the
time the process has been running cputime/realtime
ratio), expressed as a percentage. ...
(alias pcpu).
并且TIME
有两个匹配项,但只有一个匹配hh:mm:ss
格式:
cputime TIME cumulative CPU time, "[DD-]hh:mm:ss" format. (alias time).
累积 CPU 时间是处理器运行进程所花费的时间量,即实际使用 CPU 周期,而不是休眠、等待运行或等待 I/O 的时间。
它是通过对中描述的utime
和值求和来确定的stime
proc(5) 手册页。
utime %lu Amount of time that this process has been scheduled in user mode...
stime %lu Amount of time that this process has been scheduled in kernel mode...