Add -E and --show-elapsed flag to show the elapsed time.

[jooris-hadeler]

Changes

• add the -E and --show-elapsed flags to optionally enable a elapsed time counter

Origin

Recently when I was benchmarking software for my university course, I found that hyperfine gives you very little information about how long the current run has been running. This is very unfortunate because you can't tell if your program has possibly deadlocked. This pull request adds the -E and --show-elapsed flags which will show you for how long the current run is running.

[sharkdp]

Thank you. Did you see #416 and #581? How does this compare to previous approaches? Also, do you think we should make this enabled by default?

[jooris-hadeler]

I must say I completely forgot to check if someone had already proposed this. Compared to #416 it is quite similar, although in comparison to #581 this would always show the time for the current run, regardless of it being the initial or a followup run. I think this feature is only really necessary in some specific cases (e.g. the mentioned long runs where it might crash), I think it would be wise to hide this behind a flag.