packed_simd
aho-corasick
packed_simd | aho-corasick | |
---|---|---|
4 | 21 | |
578 | 955 | |
1.4% | - | |
4.9 | 7.2 | |
13 days ago | about 2 months ago | |
Rust | Rust | |
Apache License 2.0 | The Unlicense |
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packed_simd
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The Unicode Consortium announces ICU4X 1.0, its new high-performance internationalization library. It's written in Rust, with official C++ and JavaScript wrappers available.
Oh, and the "fix" was to replace crate with pub(crate) all over the code: https://github.com/rust-lang/packed_simd/pull/344
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OctaSine, a FM-based VST2 synthesizer written in Rust
At some point, I decided that I wanted to accelerate the synthesis with SIMD. I started out with using packed_simd, but switched to simdeez to abstract over vector widths and enable runtime detection. However, I wanted more flexibility and the option of splitting SIMD code into multiple functions. My solution was to skip frameworks and instead use custom traits and the duplicate crate to abstract over Rust simd instrinsics for different instruction sets. I use sleef for fast sines.
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uwuify - fastest test uwuifier in the west: simd vectorized and multithreaded command-line tool for text uwu-ing at the speed of simply copying a file
The packed_simd crate abstracts over various SIMD instruction sets.
aho-corasick
- Aho-Corasick Algorithm
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Identifying Rust's collect:<Vec<_>>() memory leak footgun
You can't build the contiguous variant directly from a sequence of patterns. You need some kind of intermediate data structure to incrementally build a trie in memory. The contiguous NFA needs to know the complete picture of each state in order to compress it into memory. It makes decisions like, "if the number of transitions of this state is less than N, then use this representation" or "use the most significant N bits of the state pointer to indicate its representation." It is difficult to do this in an online fashion, and likely impossible to do without some sort of compromise. For example, you don't know how many transitions each state has until you've completed construction of the trie. But how do you build the trie if the state representation needs to know the number of transitions?
Note that the conversion from a non-contiguous NFA to a contiguous NFA is, relatively speaking, pretty cheap. The only real reason to not use a contiguous NFA is that it can't represent as many patterns as a non-contiguous NFA. (Because of the compression tricks it uses.)
The interesting bits start here: https://github.com/BurntSushi/aho-corasick/blob/f227162f7c56...
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Ask HN: What's the fastest programming language with a large standard library?
Right. I pointed it out because it isn't just about having portable SIMD that makes SIMD optimizations possible. Therefore, the lack of one in Rust doesn't have much explanatory power for why Rust's standard library doesn't contain SIMD. (It does have some.) It's good enough for things like memchr (well, kinda, NEON doesn't have `movemask`[1,2]), but not for things like Teddy that do multi-substring search. When you do want to write SIMD across platforms, it's not too hard to define your own bespoke portable API[3].
I'm basically just pointing out that a portable API is somewhat oversold, because it's not uncommon to need to abandon it, especially for string related ops that make creative use of ISA extensions. And additionally, that Rust unfortunately has other reasons for why std doesn't make as much use of SIMD as it probably should (the core/alloc/std split).
[1]: https://github.com/BurntSushi/memchr/blob/c6b885b870b6f1b9bf...
[2]: https://github.com/BurntSushi/memchr/blob/c6b885b870b6f1b9bf...
[3]: https://github.com/BurntSushi/aho-corasick/blob/f227162f7c56...
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Ripgrep is faster than {grep, ag, Git grep, ucg, pt, sift}
Oh I see. Yes, that's what is commonly used in academic publications. But I've yet to see it used in the wild.
I mentioned exactly that paper (I believe) in my write-up on Teddy: https://github.com/BurntSushi/aho-corasick/tree/master/src/p...
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how to get the index of substring in source string, support unicode in rust.
The byte offset (or equivalently in this case, the UTF-8 code unit offset) is almost certainly what you want. See: https://github.com/BurntSushi/aho-corasick/issues/72
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Aho Corasick Algorithm For Efficient String Matching (Python & Golang Code Examples)
This is an implementation of the algorithm in Rust as well if someone is curious. Though this code is written for production and not teaching.
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When counting lines in Ruby randomly failed our deployments
A similar fix for the aho-corasick Rust crate was made in response
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Aho-corasick (and the regex crate) now uses SIMD on aarch64
Teddy is a SIMD accelerated multiple substring matching algorithm. There's a nice description of Teddy here: https://github.com/BurntSushi/aho-corasick/tree/f9d633f970bb...
It's used in the aho-corasick and regex crates. It now supports SIMD acceleration on aarch64 (including Apple's M1 and M2). There are some nice benchmarks included in the PR demonstrating 2-10x speedups for some searches!
- Stringzilla: Fastest string sort, search, split, and shuffle using SIMD
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ripgrep is faster than {grep, ag, git grep, ucg, pt, sift}
Even putting aside all of that, it might be really hard to add some of the improvements ripgrep has to their engine. The single substring search is probably the lowest hanging fruit, because you can probably isolate that code path pretty well. The multi-substring search is next, but the algorithm is very complicated and not formally described anywhere. The best description of it, Teddy, is probably my own. (I did not invent it.)
What are some alternatives?
OctaSine - Frequency modulation synthesizer plugin (VST2, CLAP). Runs on macOS, Windows and Linux.
ripgrep - ripgrep recursively searches directories for a regex pattern while respecting your gitignore
duplicate - Easy code duplicate with substitution for Rust
uwu - fastest text uwuifier in the west
simdeez - easy simd
perf-book - The Rust Performance Book
iced_baseview - A baseview backend for the Iced GUI library
bat - A cat(1) clone with wings.
baseview - low-level window system interface for audio plugin UIs
fzf - :cherry_blossom: A command-line fuzzy finder
fd - A simple, fast and user-friendly alternative to 'find'