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