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35b7652058
When every element is a String sharing one ASCII-compatible fast-path encoding (UTF-8/US-ASCII/ASCII-8BIT) and the separator is compatible, build the result with a single memcpy pass instead of appending element by element through rb_str_buf_append. Other cases fall back to the existing path.
35 lines
1.3 KiB
YAML
35 lines
1.3 KiB
YAML
prelude: |
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# All elements are 7-bit ASCII Strings (the dominant real-world join case).
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# Distinct objects so large-N cases exercise realistic heap/cache behavior.
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a100_1 = Array.new(100) { "a" * 1 }
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a100_8 = Array.new(100) { "a" * 8 }
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a100_40 = Array.new(100) { "a" * 40 }
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a1k_1 = Array.new(1000) { "a" * 1 }
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a1k_8 = Array.new(1000) { "a" * 8 }
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a1k_40 = Array.new(1000) { "a" * 40 }
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a100k_1 = Array.new(100000) { "a" * 1 }
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a100k_8 = Array.new(100000) { "a" * 8 }
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a100k_40 = Array.new(100000) { "a" * 40 }
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benchmark:
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# separator " " (space)
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join_sp_n100_e1: a100_1.join(" ")
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join_sp_n100_e8: a100_8.join(" ")
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join_sp_n100_e40: a100_40.join(" ")
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join_sp_n1k_e1: a1k_1.join(" ")
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join_sp_n1k_e8: a1k_8.join(" ")
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join_sp_n1k_e40: a1k_40.join(" ")
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join_sp_n100k_e1: a100k_1.join(" ")
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join_sp_n100k_e8: a100k_8.join(" ")
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join_sp_n100k_e40: a100k_40.join(" ")
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# separator "\n" (newline)
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join_nl_n100_e1: a100_1.join("\n")
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join_nl_n100_e8: a100_8.join("\n")
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join_nl_n100_e40: a100_40.join("\n")
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join_nl_n1k_e1: a1k_1.join("\n")
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join_nl_n1k_e8: a1k_8.join("\n")
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join_nl_n1k_e40: a1k_40.join("\n")
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join_nl_n100k_e1: a100k_1.join("\n")
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join_nl_n100k_e8: a100k_8.join("\n")
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join_nl_n100k_e40: a100k_40.join("\n")
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