ruby.git/benchmark/string_split.yml, branch v3_4_9

Added String#split benchmark for empty regexp

2020-05-12T13:59:58+00:00

|               |compare-ruby|built-ruby|
|:--------------|-----------:|---------:|
|re_chars-1     |    169.230k|  973.855k|
|               |           -|     5.75x|
|re_chars-10    |     25.536k|  107.598k|
|               |           -|     4.21x|
|re_chars-100   |      2.621k|   11.207k|
|               |           -|     4.28x|
|re_chars-1000  |     259.098|    1.133k|
|               |           -|     4.37x|

Optimize String#split

2020-05-12T10:58:58+00:00

Optimized `String#split` with `/ /` (single space regexp) as
simple string splitting.  [ruby-core:98272]

|               |compare-ruby|built-ruby|
|:--------------|-----------:|---------:|
|re_space-1     |    432.786k|    1.539M|
|               |           -|     3.56x|
|re_space-10    |     76.231k|  191.547k|
|               |           -|     2.51x|
|re_space-100   |      8.152k|   19.557k|
|               |           -|     2.40x|
|re_space-1000  |     837.405|    2.022k|
|               |           -|     2.41x|

ruby-core:98272: https://bugs.ruby-lang.org/issues/15771#change-85511

string.c: improve splitting into chars

2019-04-17T05:34:46+00:00

* string.c (rb_str_split_m): improve splitting into chars by an
  empty string, without a regexp.

    Comparison:
                           to_chars-1
              built-ruby:   1273527.6 i/s
            compare-ruby:    189423.3 i/s - 6.72x  slower

                          to_chars-10
              built-ruby:    120993.5 i/s
            compare-ruby:     37075.8 i/s - 3.26x  slower

                         to_chars-100
              built-ruby:     15646.4 i/s
            compare-ruby:      4012.1 i/s - 3.90x  slower

                        to_chars-1000
              built-ruby:      1295.1 i/s
            compare-ruby:       408.5 i/s - 3.17x  slower

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67582 b2dd03c8-39d4-4d8f-98ff-823fe69b080e