Created
January 18, 2012 13:28
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Couting occurrencies in an Enumerable
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| require 'benchmark' | |
| # create some data | |
| DAT = (3..7).map do |i| | |
| Array.new(10 ** i) { rand 100 } | |
| end | |
| 2.times do | |
| Benchmark.bm 15 do |b| | |
| DAT.each do |ar| | |
| n = [1000000 / ar.size, 10].max | |
| printf "Size %10d n=%10d\n", ar.size, n | |
| b.report("Ralph Shneiver:"){ n.times { result = Hash.new(0); ar.each { |x| result[x] += 1 }; result} } | |
| b.report("Sigurd:") { n.times { ar.inject(Hash.new(0)) {|res, x| res[x] += 1; res } } } | |
| b.report("Keinich #1") { n.times { Hash[ar.group_by{|n|n}.map{|k,v|[k, v.size]}] } } | |
| b.report("RK #1") { n.times { ar.group_by{|n|n}.tap {|h|h.each{|k,v|h[k]=v.size}} } } | |
| b.report("Keinich #2") { n.times { Hash.new(0).tap{|h|ar.each{|n|h[n] += 1}} } } | |
| b.report("Magnus Holm:") { n.times { ar.each_with_object(Hash.new(0)) { |x, res| res[x] += 1 } } } | |
| b.report("Abinoam #1:") { n.times { Hash[ar.sort.chunk {|n| n}.map {|ix, els| [ix, els.size] } ] } } | |
| end | |
| end | |
| end |
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| $ ruby19 bm.rb | |
| user system total real | |
| Size 1000 n= 1000 | |
| Ralph Shneiver: 0.344000 0.000000 0.344000 ( 0.347000) | |
| Sigurd: 0.422000 0.000000 0.422000 ( 0.410000) | |
| Keinich #1 1.765000 0.000000 1.765000 ( 1.767000) | |
| RK #1 1.188000 0.000000 1.188000 ( 1.194000) | |
| Keinich #2 0.390000 0.000000 0.390000 ( 0.395000) | |
| Magnus Holm: 0.500000 0.000000 0.500000 ( 0.492000) | |
| Abinoam #1: 2.360000 0.000000 2.360000 ( 2.354000) | |
| Size 10000 n= 100 | |
| Ralph Shneiver: 0.359000 0.000000 0.359000 ( 0.365000) | |
| Sigurd: 0.375000 0.000000 0.375000 ( 0.374000) | |
| Keinich #1 0.375000 0.000000 0.375000 ( 0.381000) | |
| RK #1 0.438000 0.000000 0.438000 ( 0.428000) | |
| Keinich #2 0.312000 0.000000 0.312000 ( 0.316000) | |
| Magnus Holm: 0.375000 0.000000 0.375000 ( 0.378000) | |
| Abinoam #1: 0.625000 0.000000 0.625000 ( 0.619000) | |
| Size 100000 n= 10 | |
| Ralph Shneiver: 0.313000 0.000000 0.313000 ( 0.310000) | |
| Sigurd: 0.375000 0.000000 0.375000 ( 0.371000) | |
| Keinich #1 0.343000 0.000000 0.343000 ( 0.357000) | |
| RK #1 0.313000 0.000000 0.313000 ( 0.306000) | |
| Keinich #2 0.312000 0.000000 0.312000 ( 0.317000) | |
| Magnus Holm: 0.391000 0.000000 0.391000 ( 0.383000) | |
| Abinoam #1: 0.484000 0.000000 0.484000 ( 0.486000) | |
| Size 1000000 n= 10 | |
| Ralph Shneiver: 3.125000 0.000000 3.125000 ( 3.126000) | |
| Sigurd: 3.750000 0.000000 3.750000 ( 3.748000) | |
| Keinich #1 2.797000 0.016000 2.813000 ( 2.814000) | |
| RK #1 2.797000 0.000000 2.797000 ( 2.792000) | |
| Keinich #2 3.172000 0.000000 3.172000 ( 3.182000) | |
| Magnus Holm: 3.844000 0.000000 3.844000 ( 3.845000) | |
| Abinoam #1: 4.718000 0.016000 4.734000 ( 4.730000) | |
| Size 10000000 n= 10 | |
| Ralph Shneiver: 31.329000 0.000000 31.329000 ( 31.324000) | |
| Sigurd: 37.640000 0.000000 37.640000 ( 37.679000) | |
| Keinich #1 26.438000 0.375000 26.813000 ( 26.846000) | |
| RK #1 26.343000 0.203000 26.546000 ( 26.591000) | |
| Keinich #2 31.718000 0.000000 31.718000 ( 31.709000) | |
| Magnus Holm: 38.641000 0.000000 38.641000 ( 38.661000) | |
| Abinoam #1: 44.531000 0.344000 44.875000 ( 44.869000) | |
| user system total real | |
| Size 1000 n= 1000 | |
| Ralph Shneiver: 0.344000 0.000000 0.344000 ( 0.343000) | |
| Sigurd: 0.406000 0.000000 0.406000 ( 0.409000) | |
| Keinich #1 1.703000 0.016000 1.719000 ( 1.728000) | |
| RK #1 1.250000 0.000000 1.250000 ( 1.245000) | |
| Keinich #2 0.344000 0.000000 0.344000 ( 0.349000) | |
| Magnus Holm: 0.422000 0.000000 0.422000 ( 0.410000) | |
| Abinoam #1: 2.406000 0.000000 2.406000 ( 2.415000) | |
| Size 10000 n= 100 | |
| Ralph Shneiver: 0.313000 0.000000 0.313000 ( 0.313000) | |
| Sigurd: 0.375000 0.000000 0.375000 ( 0.374000) | |
| Keinich #1 0.437000 0.000000 0.437000 ( 0.438000) | |
| RK #1 0.328000 0.000000 0.328000 ( 0.333000) | |
| Keinich #2 0.329000 0.000000 0.329000 ( 0.317000) | |
| Magnus Holm: 0.375000 0.000000 0.375000 ( 0.378000) | |
| Abinoam #1: 0.671000 0.000000 0.671000 ( 0.667000) | |
| Size 100000 n= 10 | |
| Ralph Shneiver: 0.313000 0.000000 0.313000 ( 0.315000) | |
| Sigurd: 0.375000 0.000000 0.375000 ( 0.376000) | |
| Keinich #1 0.297000 0.000000 0.297000 ( 0.306000) | |
| RK #1 0.265000 0.000000 0.265000 ( 0.257000) | |
| Keinich #2 0.313000 0.000000 0.313000 ( 0.319000) | |
| Magnus Holm: 0.391000 0.000000 0.391000 ( 0.381000) | |
| Abinoam #1: 0.421000 0.000000 0.421000 ( 0.432000) | |
| Size 1000000 n= 10 | |
| Ralph Shneiver: 3.110000 0.000000 3.110000 ( 3.104000) | |
| Sigurd: 3.734000 0.000000 3.734000 ( 3.730000) | |
| Keinich #1 2.594000 0.015000 2.609000 ( 2.608000) | |
| RK #1 2.609000 0.000000 2.609000 ( 2.607000) | |
| Keinich #2 3.172000 0.000000 3.172000 ( 3.175000) | |
| Magnus Holm: 3.844000 0.000000 3.844000 ( 3.844000) | |
| Abinoam #1: 4.391000 0.000000 4.391000 ( 4.392000) | |
| Size 10000000 n= 10 | |
| Ralph Shneiver: 31.296000 0.000000 31.296000 ( 31.304000) | |
| Sigurd: 37.407000 0.000000 37.407000 ( 37.402000) | |
| Keinich #1 26.187000 0.125000 26.312000 ( 26.313000) | |
| RK #1 26.063000 0.203000 26.266000 ( 26.277000) | |
| Keinich #2 31.734000 0.000000 31.734000 ( 31.798000) | |
| Magnus Holm: 38.281000 0.000000 38.281000 ( 38.275000) | |
| Abinoam #1: 43.688000 0.594000 44.282000 ( 44.387000) |
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