anchor.diff:    node_stats   % dict of the node stats
   }).
   
  +-define(PROCNET, "/proc/net/dev").
   -define(SERVER, ?MODULE).
   
   %%====================================================================
  
positive.code:   node_stat/1,
    node_dump/0,
    node_dump/1,
    node_dump/2
  ]).
  
  %% gen_server callbacks
  
negative.code: node_dump() -> gen_server:call(?SERVER, {node_dump}).
  node_dump(Key) -> gen_server:call(?SERVER, {node_dump, Key}).
  node_dump(Key, Range) -> gen_server:call(?SERVER, {node_dump, Key, Range}).
  
  get_avg_cpu_load()-> gen_server:call(?SERVER, {get_avg_cpu}).
  get_free_memory() -> gen_server:call(?SERVER, {get_free_mem}).
  get_net_stat() -> gen_server:call(?SERVER,{get_net_stat}).
  
  %%--------------------------------------------------------------------
  %% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
  