anchor.diff:  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   % @doc spawns threads and collect statistics
   -spec run_threads(integer(),
  -                  fun((Parent::comm:erl_local_pid()) -> any())) ->
  -    {Mean::float(), Variance::float(), Min::non_neg_integer(),
  -     Max::non_neg_integer(), Aborts::non_neg_integer()}.
  +                  fun((Parent::comm:erl_local_pid()) -> any())) -> ok.
   run_threads(Threads, Bench) ->
       Self = self(),
       TraceMPath = erlang:get(trace_mpath),
  
positive.code: -export([run_threads/2]).
  
  -record(state,
          {load_pid :: pid() | ok
           }).
  
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  
negative.code:                                                      erlang:put(trace_mpath, TraceMPath),
                                                       Bench(Self)
                                               end) end),
      ok.
  