Shaughnessy String Creation Benchmarks Across VMs

new-string-benchmark.rb

#!/usr/bin/env ruby
require 'benchmark'

def run str, bench
  bench.report "#{str.length + 1} chars" do
    1_000_000.times do
      new_string = str + 'x'
    end
  end
end

Benchmark.bm do |bench|
  run '12345678901234567890', bench
  run '123456789012345678901', bench
  run '1234567890123456789012', bench
  run '12345678901234567890123', bench
  run '123456789012345678901234', bench
  run '1234567890123456789012345', bench
end

#=>

=begin

Ruby 1.9.3-p194
       user     system      total        real
21 chars  0.200000   0.000000   0.200000 (  0.201233)
22 chars  0.200000   0.000000   0.200000 (  0.201134)
23 chars  0.200000   0.000000   0.200000 (  0.201519)
24 chars  0.350000   0.000000   0.350000 (  0.346913)
25 chars  0.340000   0.000000   0.340000 (  0.341198)
26 chars  0.340000   0.000000   0.340000 (  0.343886)

Jruby 1.7.0-preview1
       user     system      total        real
21 chars  0.480000   0.020000   0.500000 (  0.238000)
22 chars  0.150000   0.010000   0.160000 (  0.108000)
23 chars  0.110000   0.000000   0.110000 (  0.103000)
24 chars  0.110000   0.010000   0.120000 (  0.109000)
25 chars  0.110000   0.010000   0.120000 (  0.104000)
26 chars  0.100000   0.010000   0.110000 (  0.103000)

RBX 2.0.0-testing
      user     system      total        real
21 chars  1.868204   0.003903   1.872107 (  1.715648)
22 chars  1.614931   0.000488   1.615419 (  1.609778)
23 chars  1.494799   0.000220   1.495019 (  1.494987)
24 chars  1.543366   0.000240   1.543606 (  1.543594)
25 chars  1.498119   0.000201   1.498320 (  1.498287)
26 chars  1.497441   0.000201   1.497642 (  1.497627)

Maglev 1.0.0
      user     system      total        real
21 chars  0.110000   0.000000   0.110000 (  0.111422)
22 chars  0.110000   0.000000   0.110000 (  0.110823)
23 chars  0.110000   0.000000   0.110000 (  0.111872)
24 chars  0.110000   0.000000   0.110000 (  0.112523)
25 chars  0.120000   0.000000   0.120000 (  0.111724)
26 chars  0.110000   0.000000   0.110000 (  0.113601)

MacRuby 0.12
      user     system      total        real
21 chars  1.650000   0.040000   1.690000 (  1.331783)
22 chars  1.660000   0.040000   1.700000 (  1.349648)
23 chars  1.690000   0.040000   1.730000 (  1.380626)
24 chars  1.790000   0.040000   1.830000 (  1.482177)
25 chars  1.920000   0.050000   1.970000 (  1.594381)
26 chars  1.930000   0.040000   1.970000 (  1.618617)

http://patshaughnessy.net/2012/1/4/never-create-ruby-strings-longer-than-23-characters

=end