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[Feature #13884] Reduce number of memory allocations for "and", "or" and "diff" operations on small arrays Very often, arrays are used to filter parameters and to select interesting items from 2 collections and very often these collections are small enough, for example: ```ruby SAFE_COLUMNS = [:id, :title, :created_at] def columns @all_columns & SAFE_COLUMNS end ``` In this patch, I got rid of unnecessary memory allocations for small arrays when "and", "or" and "diff" operations are performed. name | HEAD | PATCH -----------------+------:+------: array_small_and | 0.615 | 0.263 array_small_diff | 0.676 | 0.282 array_small_or | 0.953 | 0.463 name | PATCH -----------------+------: array_small_and | 2.343 array_small_diff | 2.392 array_small_or | 2.056 name | HEAD | PATCH -----------------+------:+------: array_small_and | 1.429 | 1.005 array_small_diff | 1.493 | 0.878 array_small_or | 1.672 | 1.152 name | PATCH -----------------+------: array_small_and | 1.422 array_small_diff | 1.700 array_small_or | 1.452 Author: Dmitry Bochkarev <dimabochkarev@gmail.com> git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60057 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
17 lines
442 B
Ruby
17 lines
442 B
Ruby
MIN_SIZE = ENV.fetch('SMALL_ARRAY_MIN', 0).to_i
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MAX_SIZE = ENV.fetch('SMALL_ARRAY_MAX', 16).to_i
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ITERATIONS = ENV.fetch('SMALL_ARRAY_ITERATIONS', 100).to_i
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ARRAYS = (MIN_SIZE..MAX_SIZE).map do |size1|
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(MIN_SIZE..MAX_SIZE).map do |size2|
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[Array.new(size1) { rand(MAX_SIZE) }, Array.new(size2) { rand(MAX_SIZE) }]
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end
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end
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ITERATIONS.times do
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ARRAYS.each do |group|
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group.each do |arr1, arr2|
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arr1 | arr2
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end
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end
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end
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