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Discussion on: Benchmarking or "How to count words really fast"

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timclicks profile image
Tim McNamara

Really like that you have broken down all of the steps and taken the time to benchmark each of them.

Some other suggestions:

Maybe stream stdin, rather than reading the whole thing at the start? io::stdin().read_to_end(&mut buffer).ok(); feels expensive.

Perhaps pick a specialized hash function that's happy with short strings.

Maybe use Vec::with_capacity(words.len()) rather than the vec![] macro when you construct multiple and single. That'll avoid several allocations. Although it also will probably waste a lot of memory.

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mrcryn profile image
Marc Ryan Riginding Author

Great ideas, i'll update my code and measure.

Im primarily interested in optimizing for runtime, but I think it would be interesting to see how the implementation differs if you optimize for space.