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I got a result from linux time command.
real 119m10.626s
user 133m0.952s
sys 20m32.155s
From the information I searched, it seems that user+sys should less than real, but it is not the case here.
Does somebody know why?
Multiple CPUs.
A multi-threaded application can run simultaneously on multiple CPU cores, (and thus accumulating CPU Time as multiples of real time)