performance measurements

Each table row shows performance measurements for this Ruby program with a particular command-line input value N.

 N  CPU secs Elapsed secs Memory KB Code B ≈ CPU Load
120.421.256,900402  26% 27% 31% 36%
168.038.0430,612402  97% 1% 4% 1%
20165.89166.03265,052402  0% 0% 100% 1%

Read the ↓ make, command line, and program output logs to see how this program was run.

Read binary-trees benchmark to see what this program should do.

 notes

ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-linux]

 binary-trees Ruby #4 program source code

# The Computer Language Benchmarks Game
# http://benchmarksgame.alioth.debian.org
#
# contributed by Jesse Millikan
# Modified by Wesley Moxam
# Modified by Scott Leggett

def item_check(left, item, right)
    if left
        item + item_check(*left) - item_check(*right)
    else
        item
    end
end

def bottom_up_tree(item, depth)
    if depth > 0
        item_item = 2 * item
        depth -= 1
        [bottom_up_tree(item_item - 1, depth), item, bottom_up_tree(item_item, depth)]
    else
        [nil, item, nil]
    end
end

max_depth = ARGV[0].to_i
min_depth = 4

max_depth = [min_depth + 2, max_depth].max

stretch_depth = max_depth + 1
stretch_tree = bottom_up_tree(0, stretch_depth)

puts "stretch tree of depth #{stretch_depth}\t check: #{item_check(*stretch_tree)}"
stretch_tree = nil

long_lived_tree = bottom_up_tree(0, max_depth)

min_depth.step(max_depth + 1, 2) do |depth|
  iterations = 2**(max_depth - depth + min_depth)

  check = 0

  (1..iterations).each do |i|
    check += item_check(*bottom_up_tree(i, depth))
    check += item_check(*bottom_up_tree(-i, depth))
  end

  puts "#{iterations * 2}\t trees of depth #{depth}\t check: #{check}"
end

puts "long lived tree of depth #{max_depth}\t check: #{item_check(*long_lived_tree)}"

 make, command-line, and program output logs

Mon, 17 Nov 2014 18:55:20 GMT

COMMAND LINE:
/usr/local/src/ruby/bin/ruby binarytrees.yarv-4.yarv 20

PROGRAM OUTPUT:
stretch tree of depth 21	 check: -1
2097152	 trees of depth 4	 check: -2097152
524288	 trees of depth 6	 check: -524288
131072	 trees of depth 8	 check: -131072
32768	 trees of depth 10	 check: -32768
8192	 trees of depth 12	 check: -8192
2048	 trees of depth 14	 check: -2048
512	 trees of depth 16	 check: -512
128	 trees of depth 18	 check: -128
32	 trees of depth 20	 check: -32
long lived tree of depth 20	 check: -1

Revised BSD license

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