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countwords
Playing with counting word frequencies (and performance) in various languages. (by kimono-koans)
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countwords
Discontinued Playing with counting word frequencies (and performance) in various languages.
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InfluxDB
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This might actually be interesting to you: https://benhoyt.com/writings/count-words/
It benchmarks programs that count the total number of unique words in some input. It's not exactly equivalent to your problem, but it's similarish. All of the programs used some kind of hash map for lookups, but I contributed a program that used a trie. Its performance in my experience varies depending on the CPU interestingly enough. On my old CPU (i7-6900K) it was a little slower, but on my new cpu (i9-12900KS) it was faster.