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added an argument (-w, --warmup) to do a warmup run of every command#65

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SuSonicTH wants to merge 1 commit intoandrewrk:mainfrom
SuSonicTH:main
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added an argument (-w, --warmup) to do a warmup run of every command#65
SuSonicTH wants to merge 1 commit intoandrewrk:mainfrom
SuSonicTH:main

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To get more accurate wall_time for long running commands (i.e. just 3 samples) where file system cache might have a huge impact on the wall_time I added a --warmup argument to run each argument once before mesuring.

This improves my current wall_time mesurement from a delta of -5.1% ± 9.8% to -0.2% ± 0.9% (for the same executable)

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