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require 'benchmark'

total = (ENV['TOTAL'] || 1_000).to_i

Benchmark.bmbm do |x|
  x.report("loop") do
    times = 0
    while times < total
      Dir['']
      times += 1
    end
  end

  x.report("Dir[]") do
    times = 0
    while times < total
      Dir["spec/**/*_spec.rb"]
      times += 1
    end
  end
end

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euler:rubinius brian$ TOTAL=10 ruby glob.rb 
Rehearsal -----------------------------------------
loop    0.000000   0.000000   0.000000 (  0.000029)
Dir[]   0.100000   0.300000   0.400000 (  0.412668)
-------------------------------- total: 0.400000sec

            user     system      total        real
loop    0.000000   0.000000   0.000000 (  0.000017)
Dir[]   0.100000   0.310000   0.410000 (  0.431814)

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euler:rubinius brian$ TOTAL=10 shotgun/rubinius glob.rb 
Rehearsal -----------------------------------------
loop    0.000821   0.000000   0.000821 (  0.000830)
Dir[]  95.112058   0.000000  95.112058 ( 95.112051)
------------------------------- total: 95.112879sec

            user     system      total        real
loop    0.004152   0.000000   0.004152 (  0.004164)
Dir[]  95.648290   0.000000  95.648290 ( 95.648307)