https://github.com/ana06/ruby-tabulation

Project in which I analyze if the Ruby Hashing algorithm could be improved using Tabulation Hashing
https://github.com/ana06/ruby-tabulation

benchmarks c columbia-university report ruby tabulation

Last synced: 30 days ago
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Project in which I analyze if the Ruby Hashing algorithm could be improved using Tabulation Hashing

• Host: GitHub
• URL: https://github.com/ana06/ruby-tabulation
• Owner: Ana06
• License: gpl-3.0
• Created: 2020-05-10T17:03:00.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-05-14T21:41:39.000Z (over 4 years ago)
• Last Synced: 2024-11-30T20:17:04.249Z (about 1 month ago)
• Topics: benchmarks, c, columbia-university, report, ruby, tabulation
• Language: TeX
• Homepage: https://bugs.ruby-lang.org/issues/16851
• Size: 360 KB
• Stars: 6
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# ruby-tabulation

Analyze if the Ruby hashing algorithm could be improved using Tabulation Hashing.

This is a project for my [Advanced Algorithms course](http://www.cs.columbia.edu/~andoni/advancedS20/index.html) by [Alexandr Andoni](http://www.cs.columbia.edu/~andoni) at Columbia University.

The written C code for the project is in the [tabulation_project branch](https://github.com/Ana06/ruby/compare/master...Ana06:tabulation_project) of my fork of the Ruby project (MRI) in GitHub.

Ruby issue: https://bugs.ruby-lang.org/issues/16851

## Results

[benchmark_tabulation.rb](benchmark_tabulation.rb) benchmarks the insertion of 600000 elements (by hashing their 64 bits ids) in an empty hash 100 times.

Below are the times (in seconds) I got executing this code for different versions of the Ruby code:

- master (without Simple Tabulation): 29.68

- master with Linear Probing (without Simple Tabulation): 99.76

- master with Quadratic Probing (without Simple Tabulation): 29.97

- master with Simple Tabulation: 15.76

- master with Linear Probing and Simple Tabulation: 24.23

- master with Quadratic Probing and Simple Tabulation: 13.73

`master` refers to ruby 2.8.0dev:

(2020-05-07T16:22:38Z master 7ded8fd) [x86_64-linux].

I tried with 8 x Intel i5-8265U.

This prove the potential of Simple Tabulation to improve current Ruby implementation.

For more details check the project report: [latex/RubyTabulation_Project.pdf](latex/RubyTabulation_Project.pdf).

## License

Code published under GNU GENERAL PUBLIC LICENSE v3 (see [LICENSE](LICENSE)).