How do we want to handle units?
E.g. some of the measures are in seconds, others in microseconds or dimension-less (e.g. ops per second).
Added units to command-line output (pretty hard-coded yet)
More units come from callgrind: #cpu-cycles!
And potentially many, many more, like memory-footprint, cache-misses, ...
We clearly need an abstraction for all this stuff! And it should define some ordering, like 'smaller=better' or 'bigger=better'.
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