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mboeh/symbol-gc.rb

Created March 8, 2015 06:29
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symbol-gc.rb
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symbol-gc.rb
puts "Ruby version: #{RUBY_VERSION}"
def show_a_sym(sym)
puts "sym #{sym} = #{sym.object_id}"
end
def pick_a_sym
a = (1..100_000).map{|s| :"dummy-#{s}" }
sym = a.sample
show_a_sym sym
sym.to_s.gsub(/dummy-/, '').to_i
end
def make_a_sym(i)
show_a_sym :"dummy-#{i}"
end
i = pick_a_sym
make_a_sym i
GC.start
make_a_sym i
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mboeh commented Mar 8, 2015

Garbage-collected symbols get new object IDs in Ruby 2.2.

Ruby version: 2.2.1
sym dummy-23284 = 14517920
sym dummy-23284 = 14517920
sym dummy-23284 = 9494360

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