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ruby--ruby/benchmark/string_concat.yml

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vm_opt_ltlt: call rb_str_buf_append directly if RHS is a String `rb_str_concat` does a lot of type checking we can easily bypass. ``` | |compare-ruby|built-ruby| |:--------------|-----------:|---------:| |string_concat | 362.007k| 398.965k| | | -| 1.10x| ```
2022-07-06 06:31:54 -04:00
prelude: |
CHUNK = "a" * 64
rb_str_buf_append: fastpath to str_buf_cat If the LHS is ASCII compatible and the RHS is 7BIT we can directly concat without being concerned about anything else. Benchmark: ``` compare-ruby: ruby 3.2.0dev (2022-07-12T15:01:11Z master 71aec68566) [arm64-darwin21] built-ruby: ruby 3.2.0dev (2022-07-13T10:13:53Z faster-buffer-conc.. a04c10476d) [arm64-darwin21] warming up... | |compare-ruby|built-ruby| |:---------------------|-----------:|---------:| |binary_append_utf8 | 385.315k| 573.663k| | | -| 1.49x| |binary_append_binary | 446.579k| 574.898k| | | -| 1.29x| |utf8_append_utf8 | 430.936k| 573.394k| | | -| 1.33x| ``` Note that in the benchmark, the RHS always have a precomputed coderange. So the benchmark never enter the slowpath of having to scan the RHS. However it's extremly likely that we'll end up scanning it anyway in rb_enc_cr_str_buf_cat
2022-06-29 04:35:41 -04:00
BCHUNK = "a".b * 64
vm_opt_ltlt: call rb_str_buf_append directly if RHS is a String `rb_str_concat` does a lot of type checking we can easily bypass. ``` | |compare-ruby|built-ruby| |:--------------|-----------:|---------:| |string_concat | 362.007k| 398.965k| | | -| 1.10x| ```
2022-07-06 06:31:54 -04:00
benchmark:
rb_str_buf_append: fastpath to str_buf_cat If the LHS is ASCII compatible and the RHS is 7BIT we can directly concat without being concerned about anything else. Benchmark: ``` compare-ruby: ruby 3.2.0dev (2022-07-12T15:01:11Z master 71aec68566) [arm64-darwin21] built-ruby: ruby 3.2.0dev (2022-07-13T10:13:53Z faster-buffer-conc.. a04c10476d) [arm64-darwin21] warming up... | |compare-ruby|built-ruby| |:---------------------|-----------:|---------:| |binary_append_utf8 | 385.315k| 573.663k| | | -| 1.49x| |binary_append_binary | 446.579k| 574.898k| | | -| 1.29x| |utf8_append_utf8 | 430.936k| 573.394k| | | -| 1.33x| ``` Note that in the benchmark, the RHS always have a precomputed coderange. So the benchmark never enter the slowpath of having to scan the RHS. However it's extremly likely that we'll end up scanning it anyway in rb_enc_cr_str_buf_cat
2022-06-29 04:35:41 -04:00
binary_concat_utf8: |
buffer = String.new(capacity: 4096, encoding: Encoding::BINARY)
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
binary_concat_binary: |
buffer = String.new(capacity: 4096, encoding: Encoding::BINARY)
buffer << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK
buffer << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK
buffer << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK
buffer << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK
buffer << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK
buffer << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK
buffer << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK
buffer << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK << BCHUNK
utf8_concat_utf8: |
buffer = String.new(capacity: 4096, encoding: Encoding::UTF_8)
vm_opt_ltlt: call rb_str_buf_append directly if RHS is a String `rb_str_concat` does a lot of type checking we can easily bypass. ``` | |compare-ruby|built-ruby| |:--------------|-----------:|---------:| |string_concat | 362.007k| 398.965k| | | -| 1.10x| ```
2022-07-06 06:31:54 -04:00
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
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