RoaringBitmap
A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others (by RoaringBitmap)
Primes
Prime Number Projects in C#/C++/Python (by davepl)
| RoaringBitmap | Primes | |
|---|---|---|
| 24 | 45 | |
| 3,388 | 2,362 | |
| 1.7% | 1.4% | |
| 8.5 | 7.0 | |
| 9 days ago | about 2 months ago | |
| Java | C# | |
| Apache License 2.0 | - |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
RoaringBitmap
Posts with mentions or reviews of RoaringBitmap.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-07-18.
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Iterating over Bit Sets Quickly
I was recently reading about Roaring https://roaringbitmap.org/ which is a highly optimized compressed bitset implementation. I reccomend reading about it if you are interested in this sort of thing. The talk at https://roaringbitmap.org/talks/ is especially good.
- Roaring Bitmaps
- Roaring bitmaps are compressed bitmaps, can be 100x faster
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What feature would you like to remove in C++26?
However, I would love compressed (not just packed) bitsets too, which is something different to me. I would make it another class with a similar interface, based on something like roaring. It doesn't need to be in the standard, but it would be nice if the API was a such that one could easily swap implementations.
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Jaccard Index
As an aside if you find yourself having to compute them on the fly, know that the Roaring Bitmaps libraries is the way to go [1]. The bitmaps are compressed, and can be streamed directly into SIMD computations (batching XORs and popcnts 256 bits wide!). The Jaccard index is just intersection_len / union_len [2] away
[1] https://roaringbitmap.org/
[2] https://roaringbitmap.readthedocs.io/en/latest/#roaringbitma...
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Looking for fast, space-efficient key-lookup
Use a two stage approach, with a bloom/cuckoo filter stored as a https://roaringbitmap.org/ in memory. Then a secondary key/value store on disk (bolt or anything else).
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BitSet Vs BigInteger
As an aside, if you're dealing with large bit sets, you might also want to evaluate Roaring Bitmaps.
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Negative Incentives in Academic Research
Sidetracking a bit the conversation. What a coincidence that the author (Lemire) is also represented on Today's #1 "Ask HN: What are some cool but obscure data structures you know about?" as he is the main contributor of RoaringBitmap https://github.com/RoaringBitmap/RoaringBitmap and one of the main authors of the data structure.
- Ask HN: What are some 'cool' but obscure data structures you know about?
- Roaring bitmaps: A better compressed bitset
Primes
Posts with mentions or reviews of Primes.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-05-29.
- Primes – A Software Drag Race
- Is this an efficient way to check if a number is prime number?
- I need some help on a project!!!
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Has anyone solved the prime number problem on SPOJ yet using pure python?
Take a look at Dave Plummer’s Prime Sieve project.
- Top 5 Fastest Programming Languages: Rust, C++, Swift, Java, and 90 more compared!
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Zig wins Dave Plummer's prime sieve benchmark ... but via a problematic metric
There's a dedicated and quite cool website where you can browse the benchmark results: https://github.com/PlummersSoftwareLLC/Primes
- Since when did Python haters spread out everywhere? Maybe DNF5 would be faster because of ditched it, maybe.
- creating a vec takes forever?
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Python vs. Nodejs vs. Lua
Should look into Software Drag Racing https://github.com/PlummersSoftwareLLC/Primes
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We wouldn’t even consider writing back-end code for a website CMS in anything other than C, and we certainly wouldn’t use any of the interpreted languages that have sprung up in the last couple of decades and positioned themselves as the de facto go-to standards for web development.
Compiler WTF??? Can't you just use xxd to turn a hexdump into a binary like a real programmer would do?!?
What are some alternatives?
When comparing RoaringBitmap and Primes you can also consider the following projects:
HyperMinHash-java - Union, intersection, and set cardinality in loglog space
primesieve - 🚀 Fast prime number generator
lucene - Apache Lucene open-source search software
PrimesResult - The results of the Dave Plummer's Primes Drag Race
CQEngine - Ultra-fast SQL-like queries on Java collections
Mudlet - ⚔️ A cross-platform, open source, and super fast MUD client with scripting in Lua
Feign - Feign makes writing java http clients easier
LMRTFY - Let Me Run That For You: A C++20 Thread Pool Library
maven-compiler-plugin - Apache Maven Compiler Plugin
zig - General-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
alexandria - Full text search engine powering Alexandria.org - the open search engine.
nimpylib - Some python standard library functions ported to Nim