benchmarks for Bug#13136

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57379 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

benchmark/bm_array_sample_100k_10.rb

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+arr = [*0...100000]
+10_000.times {arr.sample 10}

benchmark/bm_array_sample_100k_11.rb

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+arr = [*0...100000]
+10_000.times {arr.sample 11}

benchmark/bm_array_sample_100k__100.rb

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+arr = [*0...100000]
+10_000.times {arr.sample 100}

benchmark/bm_array_sample_100k__1k.rb

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+arr = [*0...100000]
+10_000.times {arr.sample 1000}

benchmark/bm_array_sample_100k__6k.rb

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+arr = [*0...100000]
+10_000.times {arr.sample 6000}

benchmark/bm_array_sample_100k___10k.rb

@@ -0,0 +1,2 @@
+arr = [*0...100000]
+10_000.times {arr.sample 10_000}

benchmark/bm_array_sample_100k___50k.rb

@@ -0,0 +1,2 @@
+arr = [*0...100000]
+10_000.times {arr.sample 50_000}