anchor.diff:      check_memory_inc(PrevMemInfo, NewMemInfo, (End - Start + 1), MyBinSize),
       ok.
   
  +create_ring_100(Config) ->
  +    % stop the initial ring (the ring is needed to initialise atoms etc.)
  +    unittest_helper:stop_ring(),
  +    garbage_collect_all(),
  +
  +    {priv_dir, PrivDir} = lists:keyfind(priv_dir, 1, Config),
  +    OldProcesses = unittest_helper:get_processes(),
  +    PrevMemInfo = get_meminfo(),
  +    util:for_to(
  +      1, 100,
  +      fun(_I) ->
  +              unittest_helper:make_ring(1, [{config, [{log_path, PrivDir}, {monitor_perf_interval, 0}]}]),
  +              unittest_helper:stop_ring()
  +      end),
  +    garbage_collect_all_and_check(10, PrevMemInfo, 0, 0),
  +    NewMemInfo = get_meminfo(),
  +    NewProcesses = unittest_helper:get_processes(),
  +    {_OnlyOld, _Both, OnlyNew} =
  +        util:split_unique(OldProcesses, NewProcesses,
  +                          fun(P1, P2) ->
  +                                  element(1, P1) =< element(1, P2)
  +                          end, fun(_P1, P2) -> P2 end),
  +    ?equals(OnlyNew, []),
  +%%     ct:pal("~p~n", [erlang:memory()]),
  +    check_memory_inc(PrevMemInfo, NewMemInfo, 0, 0),
  +    ok.
  +
  +%% @doc Starts garbage collection for all processes.
   garbage_collect_all() ->
       _ = [erlang:garbage_collect(Pid) || Pid <- processes()],
       % wait a bit for the gc to finish
  
positive.code:     #mem_info{binary = BinSize, atom_used = AtomUSize,
                processes_used = ProcUSize, ets = EtsSize}.
  
  -spec check_memory_inc_bool(PrevMemInfo::#mem_info{}, NewMemInfo::#mem_info{}, NewItems::non_neg_integer(), AddedSize::non_neg_integer()) -> boolean().
  check_memory_inc_bool(PrevMemInfo, NewMemInfo, NewItems, AddedSize) ->
      % assume an entry for an item uses 4 * 1k memory for ets (excluding the binary size)
      EntryEtsSize = 4 * 1000,
  
negative.code:     Config.
  
  end_per_testcase(_TestCase, Config) ->
      ct:pal("Memory after test:~n~p~n", [erlang:memory()]),
      unittest_helper:stop_ring(),
      garbage_collect_all(),
      ct:pal("Memory after unittest_helper:stop_ring/0:~n~p~n", [erlang:memory()]),
  