Garbage collection Example with Ruby Version

garbage.rb

# This script shows how garbage collection is done for symbols Ruby 2.2.1 onwards


# Ruby 2.1

100_000.times do |i|
  "sym_#{i}".to_sym
end
# => 100000

before = Symbol.all_symbols.size

# => 103318

GC.start
# => nil

after = Symbol.all_symbols.size

# => 103318



# Ruby 2.2.1

before = Symbol.all_symbols.size

# => 3892 

100_000.times do |i|
  "sym_#{i}".to_sym
end

# => 100000

before = Symbol.all_symbols.size

# => 5535

GC.start

# => nil

after = Symbol.all_symbols.size

# => 3892