benchmark showing that symbols live forever

results.txt

100000 Strings
After Block: 3318
After Forced GC: 31

100000 Symobls
After Block: 1519
After Forced GC: 98619

sym_never_die.rb

N = 100_000

puts "#{N} Strings"
GC.start
start = ObjectSpace.count_objects[:T_STRING]
N.times {|i| "#{i}" }
pre_gc_count = ObjectSpace.count_objects[:T_STRING] - start
GC.start
post_gc_count = ObjectSpace.count_objects[:T_STRING] - start
puts "After Block: #{pre_gc_count}"
puts "After Forced GC: #{post_gc_count}"

puts

puts "#{N} Symbols"
GC.start
pre_gc_count = Symbol.all_symbols.count
N.times {|i| "#{i}".intern }
diff = Symbol.all_symbols.count - start
GC.start
post_gc_count = Symbol.all_symbols.count - start
puts "After Block: #{pre_gc_count}"
puts "After Forced GC: #{post_gc_count}"