nafeez.xyz
hashtable-benchmarks
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nafeez.xyz | hashtable-benchmarks | |
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6 | 8 | |
14 | 29 | |
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8.4 | 4.7 | |
almost 2 years ago | 5 months ago | |
TypeScript | Java | |
GNU General Public License v3.0 or later | Apache License 2.0 |
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.
nafeez.xyz
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Ask HN: Who wants to be hired? (May 2022)
Location: Sri Lanka
Remote: Yes
Willing to relocate: Maybe
Website: https://www.nafeez.xyz/
Email: [email protected]
Technologies: React, Next JS, React Native, Typescript, Redux, Zustand, Graphql, Rest API, Prisma, Typescript, Solidity / Web 3 (beginner)
Résumé/CV: https://drive.google.com/file/d/1FCdSyX5p2iHHJadHOM4CVh7QXnH...
Hello everyone ,
I'm a frontend developer from Sri Lanka, looking for a job opportunity in frontend development.
Some of my projects I worked on:
Eisen Matrix - A prioritization app that uses Eisenhower Matrix, built with React Native. https://github.com/G3root/Eisen-Matrix
Readme Generator - README generator for GitHub profile and projects with a drag and drop interface. https://nxt-readme.vercel.app/
Maxcell.lk - An e-commerce site built with Next JS, Tailwind CSS, Prisma and Trpc.js. https://maxcell.lk
- Ask HN: Who wants to be hired? (April 2022)
- Ask HN: Who wants to be hired? (March 2022)
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Who's Available? [February 2022]
Website: https://www.nafeez.xyz/
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after so much procrastination I'm happy to say I've finally finished my personal site!.
Repo link : https://github.com/G3root/nafeez.xyz
hashtable-benchmarks
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Building a faster hash table for high performance SQL joins
Since the blog post mentioned a PR to replace linear probing with Robin Hood, I just wanted to mention that I found bidirectional linear probing to outperform Robin Hood across the board in my Java integer set benchmarks:
https://github.com/senderista/hashtable-benchmarks/blob/mast...
https://github.com/senderista/hashtable-benchmarks/wiki/64-b...
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Ask HN: Who wants to be hired? (December 2023)
https://homes.cs.washington.edu/~magda/papers/wang-cidr17.pd...
I'm most interested in developing high-performance database engines in low-level languages, but open to any challenging systems programming project. I've been working in C++ for the last 3 years, but have written nontrivial projects in Rust and Java as well (e.g., https://github.com/senderista/rotated-array-set, https://github.com/senderista/hashtable-benchmarks). I would enjoy using Rust or Zig on a new project, but I consider the project itself to be much more important than the language it's written in. I am not interested in cryptocurrency, adtech, or fintech projects.
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Factor is faster than Zig
Thanks for the details on your benchmarks. I would like sometime to extend BLP to a more generic setting; as I said I think any trick used with RH would also work with BLP. I just used an integer set because that's all I needed for my use case and it was easy to implement several different approaches for benchmarking. As you note, it favors use cases where the hash function is cheap (or invertible) and elements are cheap to move around.
About your question on load factors: no, the benchmarks are measuring exactly what they claim to be. The hash table constructor divides max data size by load factor to get the table size (https://github.com/senderista/hashtable-benchmarks/blob/mast...), and the benchmark code instantiates each hash table for exactly the measured data set size and load factor (https://github.com/senderista/hashtable-benchmarks/blob/mast...).
I can't explain the peaks around 1M in many of the plots; I didn't investigate them at the time and I don't have time now. It could be a JVM artifact, but I did try to use JMH "best practices", and there's no dynamic memory allocation or GC happening during the benchmark at all. It would be interesting to port these tables to Rust and repeat the measurements with Criterion. For more informative graphs I might try a log-linear approach: divide the intervals between the logarithmically spaced data sizes into a fixed number of subintervals (say 4).
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Inside boost::unordered_flat_map
I think "bidirectional linear probing" is an underrated approach (and much simpler): https://github.com/senderista/hashtable-benchmarks/blob/master/src/main/java/set/int64/BLPLongHashSet.java
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A fast & densely stored hashmap and hashset based on robin-hood backward shift deletion
I will probably never get around to porting my bidirectional linear probing integer hash set from Java to C++, but I hope someone can try adapting BLP to general C++ hashmaps and hashsets, because it significantly outperforms Robin Hood in my benchmarks.
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Ask HN: Who wants to be hired? (March 2022)
https://homes.cs.washington.edu/~magda/papers/wang-cidr17.pd...
I'm most interested in developing high-performance database engines in low-level languages, but open to any challenging systems programming project. I've been working in C++ for the last 2 years, but have written nontrivial projects in Rust and Java as well (e.g., https://github.com/senderista/rotated-array-set, https://github.com/senderista/hashtable-benchmarks). I would enjoy using Rust or Zig on a new project, but I consider the project itself to be much more important than the language it's written in. I am not interested in cryptocurrency, adtech, or fintech projects.
What are some alternatives?
boden - Purely native C++ cross-platform GUI framework for Android and iOS development. https://www.boden.io
unordered_dense - A fast & densely stored hashmap and hashset based on robin-hood backward shift deletion
platforms - A full-stack Next.js app with multi-tenancy and custom domain support. Built with Next.js App Router and the Vercel Domains API.
myria - Myria is a scalable Analytics-as-a-Service platform based on relational algebra.
resume - My resume, in LaTeX
js2scheme
adventofcode-21
flat_hash_map - A very fast hashtable
Eisen-Matrix - 🎯 Eisen Matrix is a prioritization app that uses Eisenhower matrix technique as workflow to prioritize a list of tasks & built with React Native for learning purposes.
robin-hood-hashing - Fast & memory efficient hashtable based on robin hood hashing for C++11/14/17/20
Personal-Site-Gourav.io - My personal site & blog made with NextJS, Typescript, Tailwind CSS, MDX, Notion as CMS. Deployed on Vercel : https://gourav.io