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Making `wc` 20x faster with parallel state machines

aarol.dev · published 20 July 2026

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https://github.com/robertdavidgraham/wc2
github.com
https://en.wikipedia.org/wiki/ASCII
en.wikipedia.org
https://ziglang.org/
ziglang.org
https://github.com/apple-oss-distributions/text_cmds/blob/main/wc/wc.c
github.com
https://github.com/coreutils/coreutils/blob/master/src/wc.c
github.com
https://github.com/uutils/coreutils/blob/main/src/uu/wc/src/wc.rs
github.com
https://github.com/robertdavidgraham/wc2/blob/master/wc2o.c
github.com
https://en.wikipedia.org/wiki/CPU_cache
en.wikipedia.org
https://joegm.github.io/blog/inside-zigs-new-writer-interface/
joegm.github.io
Linklog | sharkdp/hyperfine Read at the source ↗
github.com
https://en.wikipedia.org/wiki/Branch_predictor
en.wikipedia.org
https://en.wikipedia.org/wiki/Whitespace_character
en.wikipedia.org
https://www.man7.org/linux/man-pages/man3/mbrtowc.3.html
man7.org
https://www.man7.org/linux/man-pages/man3/iswspace.3.html
man7.org
https://github.com/apple-oss-distributions/text_cmds/blob/3342f27ec601d0988968cfb95904b6471632d821/wc/wc.c
github.com
https://github.com/robertdavidgraham/wc2/blob/master/wc2.c
github.com
https://github.com/aarol/wc-dfa-zig/blob/8249c5c043a033e87a9652de30123b6621140507/src/dfa.zig
github.com
https://en.wikipedia.org/wiki/Producer%E2%80%93consumer_problem
en.wikipedia.org
https://en.wikipedia.org/wiki/Monitor_(synchronization
en.wikipedia.org
https://andrew128.github.io/ProducerConsumer/
andrew128.github.io
https://numbat.dev
numbat.dev
https://github.com/aarol/zwc
github.com
https://ziglang.org/download/0.15.1/release-notes.html
ziglang.org
https://github.com/D-Berg/crap
github.com
https://en.wikipedia.org/wiki/UTF-8
en.wikipedia.org
https://zig.godbolt.org/z/jhhdWW8Es
zig.godbolt.org