performance measurements

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

 N  CPU secs Elapsed secs Memory KB Code B ≈ CPU Load
126.406.42145,048402  0% 2% 1% 100%
1611.3411.38609,240402  1% 0% 1% 100%
20166.86167.03903,012402  1% 1% 1% 100%

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

jruby 1.7.16.1 (1.9.3p392) 2014-10-28 4e93f31 on Java HotSpot(TM) Server VM 1.8.0_25-b17 +jit [linux-i386]

 binary-trees Ruby JRuby #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

Fri, 21 Nov 2014 20:16:43 GMT

MAKE:
mv binarytrees.jruby-4.jruby binarytrees.rb
0.01s to complete and log all make actions

COMMAND LINE:
/usr/local/src/jruby-1.7.16.1/bin/jruby -Xcompile.invokedynamic=true -J-server -J-Xmn512m -J-Xms768m -J-Xmx768m binarytrees.rb 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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