Performance comparison: counting words in Python, Go, C++, C, AWK, Forth, and Rust

• countwords

  9 209 5.9 Rust

  Playing with counting word frequencies (and performance) in various languages.

  Thanks -- good call. I definitely wasn't too focused on testing/hardening for this article. Someone submitted a PR to fix the no-NUL issue: https://github.com/benhoyt/countwords/pull/29

• abseil-cpp

  21 10,371 9.0 C++

  Abseil Common Libraries (C++)

  

  For those looking for a performant hash map in C++, absl::flat_hash_map is a good choice. It's very nearly a drop in replacement for std::unordered_map. I know there are some other goods one out there as well, this is just the one I use at work.

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• parallel-hashmap

  11 1,383 8.3 C++

  A family of header-only, very fast and memory-friendly hashmap and btree containers.

  The use of unordered_map and the unnecessary copy stood out to me also. I changed the copy to a move, and replaced std::unordered_map with phmap::flat_hash_map(a drop in, header-only replacement, link). I got 1.56s for the original version, and 1.29s for the new version. Scaling the results so my 1.56s corresponds to his 1.75s, the new version would land at ~1.45s on his computer, about on par with the Rust results.

• wordcount

  0 116 0.0 Java

  Counting words in different programming languages.

  Another similar experiment. And has Java included :)

• llfio

  9 455 8.3 C++

  P1031 low level file i/o and filesystem library for the C++ standard

  I'm using stdio instead of iostream, because why not. Further improvements possible with llfio.

• Klib

  7 3,553 0.6 C

  A standalone and lightweight C library

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