benchmark with/without return

bm_return.rb

require "benchmark"

def without_return
  0
end

def with_return
  return 0
end

def with_block(&blk)
  blk.call
end

def with_block_without_return
  with_block { 0 }
end

def with_block_with_return
  with_block { return 0 }
end

num = 10000000

Benchmark.bm do |x|
  x.report("without_return") do
    i = 0
    while i < num
      without_return
      i += 1
    end
  end
  x.report("with_return") do
    i = 0
    while i < num
      with_return
      i += 1
    end
  end
  x.report("with_block_without_return") do
    i = 0
    while i < num
      with_block_without_return
      i += 1
    end
  end
  x.report("with_block_with_return") do
    i = 0
    while i < num
      with_block_with_return
      i += 1
    end
  end
end

gistfile1.txt

% ./ruby-trunk -v
ruby 1.9.3dev (2011-04-21 trunk 31316) [i686-linux]
% ./ruby-trunk bm_return.rb
      user     system      total        real
without_return  5.850000   0.000000   5.850000 (  5.905988)
with_return  5.790000   0.000000   5.790000 (  5.810832)
with_block_without_return 38.080000   0.140000  38.220000 ( 38.525464)
with_block_with_return 57.610000   0.340000  57.950000 ( 58.209715)

gistfile2.txt

ruby 1.9.2p94 (2010-12-08 revision 31204) [i686-linux]

      user     system      total        real
without_return  0.870000   0.000000   0.870000 (  0.874565)
with_return  0.850000   0.000000   0.850000 (  0.849621)
with_block_without_return  5.220000   0.000000   5.220000 (  5.219810)
with_block_with_return  9.900000   0.000000   9.900000 (  9.906881)

gistfile3.txt

ruby 1.9.3dev (2011-04-23 trunk 31323) [x86_64-darwin10.7.0]

      user     system      total        real
without_return  0.820000   0.000000   0.820000 (  0.818726)
with_return  0.830000   0.000000   0.830000 (  0.825238)
with_block_without_return 13.280000   0.030000  13.310000 ( 13.291957)
with_block_with_return 15.630000   0.040000  15.670000 ( 15.831282)

gistfile4.txt

ruby 1.8.7 (2010-01-10 patchlevel 249) [i686-darwin10.3.0]

      user     system      total        real
without_return  5.450000   0.000000   5.450000 (  5.453376)
with_return  6.440000   0.000000   6.440000 (  6.436711)
with_block_without_return 35.040000   1.600000  36.640000 ( 36.632049)
with_block_with_return 37.950000   1.640000  39.590000 ( 39.597771)