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Ruby sum benchmark
require 'benchmark'
huge_array = (1..10000000).to_a
Benchmark.bmbm do |x|
puts "Adding all numbers"
x.report(:sum) { huge_array.sum }
x.report(:plus_equal) { sum = 0; huge_array.each {|i| sum += i }; sum}
x.report(:inject) { huge_array.inject(:+) }
x.report(:inject_block) { huge_array.inject(0) {|memo, i| memo + i} }
end
Benchmark.bmbm do |x|
puts "Adding only even numbers"
x.report(:sum) { huge_array.sum {|i| i.even? ? i : 0} }
x.report(:plus_equal) { sum = 0; huge_array.each {|i| sum += i if i.even? }; sum}
x.report(:inject) { huge_array.inject(0) {|memo, i| i.even? ? memo + i : memo} }
end
Adding all numbers
Rehearsal ------------------------------------------------
sum 0.025731 0.000095 0.025826 ( 0.025985)
plus_equal 0.484651 0.003383 0.488034 ( 0.504850)
inject 0.021083 0.000081 0.021164 ( 0.021441)
inject_block 0.585306 0.002565 0.587871 ( 0.602357)
--------------------------------------- total: 1.122895sec
user system total real
sum 0.024194 0.000061 0.024255 ( 0.024360)
plus_equal 0.460036 0.001802 0.461838 ( 0.470530)
inject 0.023195 0.000122 0.023317 ( 0.023391)
inject_block 0.621789 0.002185 0.623974 ( 0.635282)
Adding only even numbers
Rehearsal ----------------------------------------------
sum 0.672182 0.004191 0.676373 ( 0.701799)
plus_equal 0.695669 0.005810 0.701479 ( 0.721717)
inject 0.992774 0.008890 1.001664 ( 1.064697)
------------------------------------- total: 2.379516sec
user system total real
sum 0.756707 0.005589 0.762296 ( 0.801659)
plus_equal 0.705938 0.003404 0.709342 ( 0.725457)
inject 0.839872 0.006637 0.846509 ( 0.874628)
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