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bench_case.rb
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bench_case.rb
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require 'benchmark'
class BenchCase
def do_case1
case 1;
when 1;
end
case 1;
when 1;
end
case 1;
when 1;
end
case 1;
when 1;
end
case 1;
when 1;
end
end
def do_case2
case 1;
when 3,2,1;
end
case 1;
when 3,2,1;
end
case 1;
when 3,2,1;
end
case 1;
when 3,2,1;
end
case 1;
when 3,2,1;
end
end
def do_case3
case 1
when 10
when 9
when 8
when 7
when 6
when 5
when 4
when 3
when 2
when 1
end
case 1
when 10
when 9
when 8
when 7
when 6
when 5
when 4
when 3
when 2
when 1
end
case 1
when 10
when 9
when 8
when 7
when 6
when 5
when 4
when 3
when 2
when 1
end
case 1
when 10
when 9
when 8
when 7
when 6
when 5
when 4
when 3
when 2
when 1
end
case 1
when 10
when 9
when 8
when 7
when 6
when 5
when 4
when 3
when 2
when 1
end
end
end
def bench_case(bm)
bc = BenchCase.new
bm.report "1m x5 cases with 1 when" do
a = 0
while a < 1_000_000
bc.do_case1
a += 1
end
end
bm.report "1m x5 cases with 1 3-arg when" do
a = 0
while a < 1_000_000
bc.do_case2
a += 1
end
end
bm.report "1m x5 cases with 10 whens" do
a = 0
while a < 1_000_000
bc.do_case3
a += 1
end
end
end
if $0 == __FILE__
(ARGV[0] || 10).to_i.times { Benchmark.bm(40) {|bm| bench_case(bm)} }
end