jruby_9k_results.txt

empty            0.960000   0.240000   1.200000 (  0.706804)
empty - dup      0.820000   0.080000   0.900000 (  0.660550)
1char            0.710000   0.130000   0.840000 (  0.514980)
1char - dup      0.630000   0.000000   0.630000 (  0.613213)
5 chars          0.930000   0.010000   0.940000 (  0.853446)
5 chars - dup    1.370000   0.000000   1.370000 (  1.107195)
10 chars         1.080000   0.000000   1.080000 (  0.917764)
10 chars - dup   1.260000   0.030000   1.290000 (  1.120841)
20 chars         1.050000   0.010000   1.060000 (  0.972268)
20 chars - dup   1.490000   0.000000   1.490000 (  1.333460)
---------------------------------------- total: 10.800000sec

                     user     system      total        real
empty            0.550000   0.000000   0.550000 (  0.486022)
empty - dup      0.880000   0.000000   0.880000 (  0.686752)
1char            0.600000   0.000000   0.600000 (  0.508257)
1char - dup      0.640000   0.000000   0.640000 (  0.633246)
5 chars          1.140000   0.000000   1.140000 (  0.922640)
5 chars - dup    1.410000   0.000000   1.410000 (  1.157144)
10 chars         1.140000   0.000000   1.140000 (  0.982482)
10 chars - dup   1.240000   0.000000   1.240000 (  1.139877)
20 chars         1.090000   0.000000   1.090000 (  0.994289)
20 chars - dup   1.440000   0.010000   1.450000 (  1.303840)

mri_results.txt

Rehearsal --------------------------------------------------
empty            1.140000   0.000000   1.140000 (  1.136569)
empty - dup      2.530000   0.000000   2.530000 (  2.540167)
1char            1.050000   0.000000   1.050000 (  1.051799)
1char - dup      2.530000   0.000000   2.530000 (  2.523234)
5 chars          1.050000   0.000000   1.050000 (  1.054948)
5 chars - dup    2.550000   0.000000   2.550000 (  2.547925)
10 chars         1.080000   0.000000   1.080000 (  1.082971)
10 chars - dup   2.570000   0.000000   2.570000 (  2.567220)
20 chars         1.150000   0.000000   1.150000 (  1.152727)
20 chars - dup   2.650000   0.000000   2.650000 (  2.657810)
---------------------------------------- total: 18.300000sec

                     user     system      total        real
empty            1.060000   0.000000   1.060000 (  1.057698)
empty - dup      2.540000   0.000000   2.540000 (  2.542187)
1char            1.060000   0.000000   1.060000 (  1.057650)
1char - dup      2.560000   0.000000   2.560000 (  2.560202)
5 chars          1.060000   0.000000   1.060000 (  1.060847)
5 chars - dup    2.600000   0.000000   2.600000 (  2.592937)
10 chars         1.080000   0.000000   1.080000 (  1.089204)
10 chars - dup   2.580000   0.000000   2.580000 (  2.587015)
20 chars         1.150000   0.000000   1.150000 (  1.150635)
20 chars - dup   2.640000   0.000000   2.640000 (  2.634209

reverse.rb

```
str0 = ""
str1 = "a"
str2 = "abcde"
str3 = str2 * 2
str4 = str3 * 2

require 'benchmark'

CYCLES = 10_000_000

Benchmark.bmbm do |x|
  x.report("empty") { CYCLES.times { str0.reverse } }
  x.report("empty - dup") { CYCLES.times { str0.dup.reverse! } }

  x.report("1char") { CYCLES.times { str1.reverse } }
  x.report("1char - dup") { CYCLES.times { str1.dup.reverse! } }

  x.report("5 chars") { CYCLES.times { str2.reverse } }
  x.report("5 chars - dup") { CYCLES.times { str2.dup.reverse! } }

  x.report("10 chars") { CYCLES.times { str3.reverse } }
  x.report("10 chars - dup") { CYCLES.times { str3.dup.reverse! } }

  x.report("20 chars") { CYCLES.times { str4.reverse } }
  x.report("20 chars - dup") { CYCLES.times { str4.dup.reverse! } }
end
```