请教perl Benchmark输出解释

20 wallclock secs ( 6.34 usr +  3.98 sys = 10.32 CPU)
大牛给菜鸟我解释一下，是该程序一共运行了20秒， 用户用的cpu百分比+系统用的cpu百分比吗

刚刚查到的：http://perladvent.pm.org/2002/13th/

What you need to be concerned about is the usr and sys times. These are the amount of time your process was running on the processor and the amount of time the operating system was doing stuff on behalf of your program (memory operations mainly) respectively. These are the figures that count.