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Whether there is an inconsistency way to calculated [user] time under Windows and Linux? #195

@fyy1996

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@fyy1996

Hi~
If we run a multi-threaded instance under windows and Linux, the result of vvencFFapp output time are quite different. Whether there is an inconsistency way to calculated [user] time under Windows and Linux?
Under Linux, [user] time calculates the CPU time and [elapsed] time calculates the real time, which makes the two results far apart. However, the [user] time is close to the [elapsed] time under windows.
For example, when we encoded the same sequence, the output time under windows shows:
Total Time: 2444.479 sec. [user] 2444.479 sec. [elapsed]
the output time under Linux shows:
Total Time: 8355.226 sec. [user] 2199.891 sec. [elapsed]

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