adding an smoothed bandwidth (average) option

[chrispvm]

I'd like to be able to see a smoothed bandwidth, e.g. we can imagine that by calling by calling nethogs -a n, either of the following happens:
Instead of printing the current bandwidth it prints:

• average bandwidth across past n seconds (or time the program is open, if this is smaller than n)
• exponential moving average that approximates average across past n seconds.

Let me know if you'd accept a pull request if I implemented either of these.

[raboof]

I think the easiest way to achieve this would be to make the PERIOD constant a command-line option instead (that'd give you '1').

I think right now we don't treat 'partial windows' any differently from 'full windows' - i.e., if we've only seen 2 seconds of a connection, we'll still average it out over 5 seconds, which depending how you look at it could under-represent the connection bandwidth. That is somewhat fine since 5 seconds is pretty short, but if we want to allow users to make that window larger perhaps we should think about whether that is still reasonable.

[raboof]

shorter answer: yes, that sounds worth exploring, but I can't promise beforehand that it'll work out and get merged ;)