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-rw-r--r--benchmark/gc/binary_trees.rb63
1 files changed, 62 insertions, 1 deletions
diff --git a/benchmark/gc/binary_trees.rb b/benchmark/gc/binary_trees.rb
index af8ea72..b1693e4 100644
--- a/benchmark/gc/binary_trees.rb
+++ b/benchmark/gc/binary_trees.rb
@@ -1 +1,62 @@
-require_relative '../bm_so_binary_trees.rb'
+# The Computer Language Shootout Benchmarks
+# http://shootout.alioth.debian.org
+#
+# contributed by Jesse Millikan
+
+# disable output
+alias puts_orig puts
+def puts str
+ # disable puts
+end
+
+def item_check(tree)
+ if tree[0] == nil
+ tree[1]
+ else
+ tree[1] + item_check(tree[0]) - item_check(tree[2])
+ 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 = 16 # ARGV[0].to_i
+min_depth = 4
+
+max_depth = min_depth + 2 if min_depth + 2 > max_depth
+
+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
+
+ for i in 1..iterations
+ temp_tree = bottom_up_tree(i, depth)
+ check += item_check(temp_tree)
+
+ temp_tree = bottom_up_tree(-i, depth)
+ check += item_check(temp_tree)
+ 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)}"
+
+undef puts
+alias puts puts_orig