File: vm_gc_wb_obj.yml

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prelude: |
  class C
    attr_accessor :foo
  end
  short_lived_obj = C.new

  if RUBY_VERSION >= "2.2.0"
    GC.start(full_mark: false, immediate_mark: true, immediate_sweep: true)
  end

  short_lived = ''
benchmark:
  vm_gc_wb_obj: |
    short_lived_obj.foo = short_lived # write barrier
loop_count: 30000000