Benchmarking of String#delete and String#tr on Rubinius and MRI using Rubinius' benchmark code

gistfile1.txt

$ uname -a
Darwin [redacted] 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386

$ ruby --version
rubinius 2.0.0.n215 (1.9.3 0849828f 2013-08-03 JI) [x86_64-apple-darwin10.8.0]
$ bin/benchmark --target r benchmark/core/string/bench_delete.rb 
=== ruby ===
Empty string delete!   544648.6 (±0.7%) i/s -    2733378 in   5.018887s (cycle=23977)
Long string delete! with empty argument
                         8720.7 (±2.3%) i/s -      44000 in   5.048465s (cycle=800)
Long string delete! with non match
                         8665.7 (±1.9%) i/s -      43904 in   5.068472s (cycle=784)
Long string delete! with match
                        13123.1 (±1.0%) i/s -      65615 in   5.000482s (cycle=1193)
Huge string delete! with empty argument
                            8.1 (±0.0%) i/s -         41 in   5.083104s (cycle=1)
Huge string delete! with non match
                            8.1 (±0.0%) i/s -         41 in   5.087086s (cycle=1)
Huge string delete! with match
                           12.9 (±0.0%) i/s -         65 in   5.035324s (cycle=1)
 Empty string delete   490889.9 (±1.3%) i/s -    2469933 in   5.032542s (cycle=30493)
$ bin/benchmark --target r benchmark/core/string/bench_tr.rb 
=== ruby ===
    Empty string tr!   439106.0 (±0.9%) i/s -    2200000 in   5.010629s (cycle=17600)
Medium string tr! with empty arguments
                        71723.9 (±1.2%) i/s -     359464 in   5.012466s (cycle=6419)
Medium string tr! with non match
                        37008.1 (±1.4%) i/s -     185614 in   5.016581s (cycle=3146)
Medium string tr! with match
                         5011.3 (±1.9%) i/s -      25200 in   5.030537s (cycle=360)
Medium string tr! with a long from_str
                         4755.4 (±3.1%) i/s -      23766 in   5.003597s (cycle=466)
Medium string tr! with a long non matching from_str
                        57733.8 (±2.6%) i/s -     288408 in   4.999672s (cycle=4728)
Long string tr! with empty arguments
                         8588.5 (±0.9%) i/s -      43707 in   5.089496s (cycle=857)
Long string tr! with non match
                         4204.4 (±1.2%) i/s -      21165 in   5.034696s (cycle=415)
Long string tr! with match
                          122.9 (±0.8%) i/s -        624 in   5.076925s (cycle=12)
Long string tr! with a long from_str
                          123.1 (±0.8%) i/s -        624 in   5.067661s (cycle=12)
Long string tr! with a long non matching from_str
                         8385.3 (±1.2%) i/s -      42687 in   5.091500s (cycle=837)
     Empty string tr   425751.1 (±1.0%) i/s -    2139164 in   5.024929s (cycle=24874)

$ ruby --version
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin10.8.0]
$ bin/benchmark --target r benchmark/core/string/bench_delete.rb
=== ruby ===
Empty string delete!  2689389.5 (±3.1%) i/s -   13447226 in   5.005897s (cycle=67574)
Long string delete! with empty argument
                       167854.3 (±3.6%) i/s -     844285 in   5.036253s (cycle=12989)
Long string delete! with non match
                       166098.6 (±4.3%) i/s -     835770 in   5.041591s (cycle=12858)
Long string delete! with match
                       236891.0 (±2.0%) i/s -    1185203 in   5.005154s (cycle=16693)
Huge string delete! with empty argument
                          235.8 (±3.4%) i/s -       1196 in   5.077594s (cycle=23)
Huge string delete! with non match
                          223.7 (±5.8%) i/s -       1122 in   5.035159s (cycle=22)
Huge string delete! with match
                          407.0 (±1.5%) i/s -       2040 in   5.012839s (cycle=40)
 Empty string delete  5828576.0 (±4.3%) i/s -   29067868 in   4.998667s (cycle=79204)
$ bin/benchmark --target r benchmark/core/string/bench_tr.rb 
=== ruby ===
    Empty string tr!  2562335.9 (±2.6%) i/s -   12844468 in   5.016828s (cycle=65533)
Medium string tr! with empty arguments
                       602978.2 (±4.0%) i/s -    3020600 in   5.017684s (cycle=34325)
Medium string tr! with non match
                       738441.6 (±4.6%) i/s -    3706752 in   5.030952s (cycle=37824)
Medium string tr! with match
                       708790.4 (±4.1%) i/s -    3554080 in   5.022608s (cycle=36640)
Medium string tr! with a long from_str
                       513521.5 (±3.5%) i/s -    2565032 in   5.000990s (cycle=30904)
Medium string tr! with a long non matching from_str
                       523037.0 (±3.1%) i/s -    2637852 in   5.048163s (cycle=31403)
Long string tr! with empty arguments
                       171039.6 (±4.3%) i/s -     854896 in   5.007490s (cycle=12572)
Long string tr! with non match
                       182388.7 (±3.3%) i/s -     917631 in   5.036479s (cycle=13299)
Long string tr! with match
                       161643.0 (±3.8%) i/s -     816684 in   5.059639s (cycle=12374)
Long string tr! with a long from_str
                       149637.6 (±4.2%) i/s -     753675 in   5.045669s (cycle=11595)
Long string tr! with a long non matching from_str
                       164289.9 (±3.9%) i/s -     825574 in   5.032716s (cycle=12322)
     Empty string tr  5675181.4 (±4.0%) i/s -   28385462 in   5.011226s (cycle=79289)