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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```