mackuba.eu
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README.md
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README.md
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There seems to be some kind of performance regression in Ruby 4.0 which showed up in my project, which I think is centered around regexp matching. I extracted some minimal code from the project, which runs significantly slower on Ruby 4.0 than on 3.4.
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#### First version (commit 20923f0028e2c023bd5e48be5118c5f97f4f243a)
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Running on my server, with 1000 loops:
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```
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$ RUBYOPT="--enable-yjit" ruby test.rb 1000
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1000 * 940 = 940000 records in 13.457106019 -> 69851.57125706079 records/s
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```
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#### Minimal version (commit ccc62810ac635f3250bebe12a08d79ad5d9dd7f5)
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With 2,000,000 loops:
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```
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$ /tmp/ruby34/bin/ruby test.rb 2000000 0
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2000000 loops in 0.752061 -> 2659358.748824896 loops/s
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$ /tmp/ruby4/bin/ruby test.rb 2000000 0
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2000000 loops in 2.711216 -> 737676.3784220808 loops/s
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```
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test.rb
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test.rb
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require 'json'
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REGEXPS = [
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/linux/i, /debian/i, /ubuntu/i, /\bredhat\b/i, /\bRHEL\b/, /\bSUSE\b/, /\bCentOS\b/, /\bopensuse\b/i,
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/\bslackware\b/i, /\bKDE\b/, /\bGTK\d?\b/, /#GNOME\b/, /\bGNOME\s?\d+/, /\bkde plasma\b/i,
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/apt\-get/, /\bflatpak\b/i, /\b[Xx]org\b/
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]
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regexp = /\bslackware\b/i
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test_post = "This isn’t a very long string – but it includes some non-ASCII™ characters…"
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posts = JSON.load(File.read(File.join(__dir__, 'atprotocoldev.json')))
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loops = ARGV[0].to_i
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if loops <= 0
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time_start = Time.now
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loops.times do
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posts.each do |text|
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match = REGEXPS.any? { |r| text =~ r }
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end
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test_post =~ regexp
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end
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time_end = Time.now
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total = loops * posts.length
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total_time = time_end - time_start
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puts "#{loops} * #{posts.length} = #{total} records in #{total_time} -> #{total / total_time} records/s"
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puts "#{loops} loops in #{total_time} -> #{loops / total_time} loops/s"