Top 23 Generic Open-Source Projects

• Klib

  23 4,027 4.0 C

  A standalone and lightweight C library

Project mention: Factor is faster than Zig | news.ycombinator.com | 2023-11-10

In my example the table stores the hash codes themselves instead of the keys (because the hash function is invertible)

Oh, I see, right. If determining the home bucket is trivial, then the back-shifting method is great. The issue is just that it’s not as much of a general-purpose solution as it may initially seem.

“With a different algorithm (Robin Hood or bidirectional linear probing), the load factor can be kept well over 90% with good performance, as the benchmarks in the same repo demonstrate.”

I’ve seen the 90% claim made several times in literature on Robin Hood hash tables. In my experience, the claim is a bit exaggerated, although I suppose it depends on what our idea of “good performance” is. See these benchmarks, which again go up to a maximum load factor of 0.95 (Although boost and Absl forcibly grow/rehash at 0.85-0.9):

https://strong-starlight-4ea0ed.netlify.app/

Tsl, Martinus, and CC are all Robin Hood tables (https://github.com/Tessil/robin-map, https://github.com/martinus/robin-hood-hashing, and https://github.com/JacksonAllan/CC, respectively). Absl and Boost are the well-known SIMD-based hash tables. Khash (https://github.com/attractivechaos/klib/blob/master/khash.h) is, I think, an ordinary open-addressing table using quadratic probing. Fastmap is a new, yet-to-be-published design that is fundamentally similar to bytell (https://www.youtube.com/watch?v=M2fKMP47slQ) but also incorporates some aspects of the aforementioned SIMD maps (it caches a 4-bit fragment of the hash code to avoid most key comparisons).

As you can see, all the Robin Hood maps spike upwards dramatically as the load factor gets high, becoming as much as 5-6 times slower at 0.95 vs 0.5 in one of the benchmarks (uint64_t key, 256-bit struct value: Total time to erase 1000 existing elements with N elements in map). Only the SIMD maps (with Boost being the better performer) and Fastmap appear mostly immune to load factor in all benchmarks, although the SIMD maps do - I believe - use tombstones for deletion.

I’ve only read briefly about bi-directional linear probing – never experimented with it.

• sc

  17 2,168 6.3 C

  Common libraries and data structures for C.

Project mention: A simple hash table in C | news.ycombinator.com | 2023-06-13

• InfluxDB

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  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• frunk

  7 1,199 5.9 Rust

  Funktional generic type-level programming in Rust: HList, Coproduct, Generic, LabelledGeneric, Validated, Monoid and friends.

Project mention: Apply generic function to every tuple element | /r/learnrust | 2023-05-22

So rust doesn't support variadics, but I have heard some murmurings around the topic. In the meantime, you can still do a lot with recursive tras. The frunk crate makes working with them a lot easier: In this case

• lane

  2 860 0.0 Go

  Generic PriorityQueues, Queues, Stacks, and Deque data structures for Go

• mlib

  8 792 9.0 C

  Library of generic and type safe containers in pure C language (C99 or C11) for a wide collection of container (comparable to the C++ STL).

Project mention: preprocessor stuff - compile time pasting into other files | /r/C_Programming | 2023-12-09

This uses the preprocessing library

• lwrb

  2 770 7.5 C

  Lightweight generic ring buffer manager library

• TableKit

  0 704 0.0 Swift

  Type-safe declarative table views.

• SaaSHub

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• generic-records

  0 435 3.9 Haskell

  Generically derive traversals, lenses, and prisms.

• Observable

  1 369 1.8 Swift

  The easiest way to observe values in Swift. (by roberthein)

• genesis

  8 330 8.3 Go

  All generic functions for Go you ever need! (by life4)

  

• tst-reflect

  1 321 2.7 TypeScript

  Advanced TypeScript runtime reflection system

• queue

  7 239 5.4 Go

  ⏪️ Go package providing multiple queue implementations. Developed in a thread-safe generic way. (by adrianbrad)

Project mention: Hello, announcing v1.3.0 of my queue package: A Linked Queue implementation was added, complementing the Circular, Blocking, and Priority queues. All structures align with the standard Queue interface. Looking forward to your feedback! | /r/golang | 2023-10-26

• remark-directive

  4 223 6.4 JavaScript

  remark plugin to support directives

  

• scroll

  1 145 6.1 Rust

  Scroll - making scrolling through buffers fun since 2016 (by m4b)

• GenericDataSource

  0 133 0.0 Swift

  A generic small reusable components for data source implementation for UITableView/UICollectionView in Swift.

  

• AAFOptimusDCHAudio-Generic

  4 125 0.0

  OFFICIAL Repository for "AAF DCH Optimus Audio" Mods - Based in Microsoft Generic Driver

• imcache

  2 115 7.1 Go

  A zero-dependency generic in-memory cache Go library

• c-iterators

  3 90 4.4 C

  :books: A demonstration of implementing a "type-safe" lazy iterator interface in pure C99

• SimpleSIMD

  1 90 0.0 C#

  Easy to use SIMD accelerated Array and Span methods

• be

  7 90 6.5 Go

  The Go test helper for minimalists

Project mention: New version of minimal test helper "be" with golden file support | /r/golang | 2023-06-02

• generic-random

  0 81 1.3 Haskell

  Generic random generators (by Lysxia)

• test

  2 116 7.3 Go

  A modern generic testing assertions library for Go (by shoenig)

• graphlite

  1 73 0.0 C++

  A lightweight C++ graph library

• SaaSHub

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• Go Testing By Example (GopherCon Australia 2023)

  1 project | /r/golang | 6 Dec 2023

• Hello, announcing v1.3.0 of my queue package: A Linked Queue implementation was added, complementing the Circular, Blocking, and Priority queues. All structures align with the standard Queue interface. Looking forward to your feedback!

  1 project | /r/golang | 26 Oct 2023

• Seeking Insights: Tools Used in GitHub Actions for Security Code Checks and Vulnerability Detection

  2 projects | /r/golang | 6 Jul 2023

• A simple hash table in C

  7 projects | news.ycombinator.com | 13 Jun 2023

• New version of minimal test helper "be" with golden file support

  1 project | /r/golang | 2 Jun 2023

• Apply generic function to every tuple element

  1 project | /r/learnrust | 22 May 2023

• Introduction to the Gkit concurrent component

  1 project | /r/golang | 26 Apr 2023
• A note from our sponsor - SaaSHub
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