Rationalを最適化してみた

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Rationalは有理数を表すRubyクラス。Ruby1.0の頃から存在する歴史あるクラスだが、1.9から組み込みクラスになり、1.9.2からはTimeの内部表現の一つとして採用され、2.1からはリテラル表記が導入されるなど、その重要性は近年それなりに高まり続けている。しかし現状のRationalは、不必要に遅い実装になっている。現状のRationalがなぜ遅いのか、それをどうやって速くしようとしているのか、今年度Ruby開発プロジェクト助成金の対象者として、その技術的な概要を述べる。また、話者がなぜRationalに目を付け、その最適化を試みているのかについても話す。 Moved from: https://niconare.nicovideo.jp/watch/kn856

Software

① How to optimize
Rational
②Let's read CRuby
source code more!

Ruby 1.9.2
Internal
representa-
tion of Time

Ruby-level
method calling
in C extention

Porting speed?
Too lazy to impl
polymorphic in C?

Let's substitute
it with only C-
layer calculation

Ruby
Association
grant project
submit
http://www.ruby.or.jp/ja/news/20150803.html

Ruby
Association
grant project
adopted!!1
http://www.ruby.or.jp/ja/news/20151116.html

●
2015-10-30 Notification of result
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2016-1-4 intermediate reports
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2016-3-4 final reports

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2015-10-30 Notification of result
← HERE! #ragrant2015
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2016-1-4 intermediate reports
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2016-3-4 final reports

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+ fixnum + bignum - fixnum - bignum
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Currently
finished only
four arithmetic
operations

I will do my
best also
rest
github.com/tadd/ruby/commits/ragrant2015development

Ruby Hacking
Guide
http://i.loveruby.net/ja/rhg/book/

Clear purpose
Independent
Could write in
Ruby

230 lines
6 methods
50 commits in
17 years

Find your
interest points
based on their
file names

Another three
months, I'll try
to optimize
Rational
github.com/tadd/ruby/commits/ragrant2015development

OOPs The prime purpose of C++ programming was to add object orientation to the C programming language, which is in itself one of the most powerful programming languages. The core of the pure object-oriented programming is to create an object, in code, that has certain properties and methods. While designing C++ modules, we try to see whole world in the form of objects. For example a car is an object which has certain properties such as color, number of doors, and the like. It also has certain methods such as accelerate, brake, and so on. There are a few principle concepts that form the foundation of object-oriented programming: Object This is the basic unit of object oriented programming. That is both data and function that operate on data are bundled as a unit called as object. Class When you define a class, you define a blueprint for an object. This doesn't actually define any data, but it does define what the class name means, that is, what an object of the class will consist of and what operations can be performed on such an object. Abstraction Data abstraction refers to, providing only essential information to the outside world and hiding their background details, i.e., to represent the needed information in program without presenting the details. For example, a database system hides certain details of how data is stored and created and maintained. Similar way, C++ classes provides different methods to the outside world without giving internal detail about those methods and data. Encapsulation Encapsulation is placing the data and the functions that work on that data in the same place. While working with procedural languages, it is not always clear which functions work on which variables but object-oriented programming provides you framework to place the data and the relevant functions together in the same object. Inheritance One of the most useful aspects of object-oriented programming is code reusability. As the name suggests Inheritance is the process of forming a new class from an existing class that is from the existing class called as base class, new class is formed called as derived class. This is a very important concept of object-oriented programming since this feature helps to reduce the code size. Polymorphism The ability to use an operator or function in different ways in other words giving different meaning or functions to the operators or functions is called polymorphism. Poly refers to many. That is a single function or an operator functioning in many ways different upon the usage is called polymorphism. Overloading The concept of overloading is also a branch of polymorphism. When the exiting operator or function is made to operate on new data type, it is said to be overloaded.

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