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

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fyy1996 opened this issue Sep 9, 2022 · 1 comment
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app Concerns the application bug Something isn't working help wanted Extra attention is needed

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@fyy1996
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fyy1996 commented Sep 9, 2022

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]

@adamjw24
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Yes. On Linux the one output reports CPU time and the other the wallclock time. The former will be larger than the latter in multi-threading encoding. On Windows both outputs report the wallclock time.

If someone knows a fix this would be highly appreciated.

@adamjw24 adamjw24 added bug Something isn't working help wanted Extra attention is needed app Concerns the application labels Sep 10, 2022
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