perl运行时间如何计算？

seablue

times可以计算运行时间，但是有四个值，具体应该是算哪个？我看了手册还是不明白:confused:

1. 
   
2. times  Print  the  accumulated  user and system times for the shell and
   
3.               for processes run from the shell.  The return status is 0.
   

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777

real time is tital time.
user tiem is the time of the software run on user space
sys time is the time of the software run on kernel.