Erlang R15B03, CouchDB branch#1.2.x 1] Why `in_case(single_process)` produces so many `inactive` memory on Mac OS X in case when `<<"medianet:album:10000053">>` document size is 67.19Kb?. besides, `in_case(spawned_processes)` doesn't; 2] moreover, `in_case(spawned_update_processes)` still continue produce an `inactive` memory;

simple_couch_db_doc_behavior.erl

-module(simple_couch_db_doc_behavior).
-compile(export_all).


db_and_doc() ->
     {<<"seed_labeled_prod">>, <<"medianet:album:10000023">>}.

read_write() ->
  {DbName, DocId} = db_and_doc(),
  {ok, Db} = couch_db:open_int(DbName, []),
  {ok, Doc} = couch_db:open_doc(Db, DocId),
  {Body} = couch_doc:to_json_obj(Doc, []),
  couch_db:update_doc(Db, couch_doc:from_json_obj({Body}), []),
  couch_db:close(Db).

write(Body) ->
     {DbName, _DocId} = db_and_doc(),
     {ok, Db} = couch_db:open_int(DbName, []),
     couch_db:update_doc(Db, couch_doc:from_json_obj({Body}), []),
     couch_db:close(Db).

read() ->
     {DbName, DocId} = db_and_doc(),
     {ok, Db} = couch_db:open_int(DbName, []),
     {ok, Doc} = couch_db:open_doc(Db, DocId),
     {Body} = couch_doc:to_json_obj(Doc, []),
     couch_db:close(Db),
     Body.


run(Scenario) ->
   spawn(fun() -> in_case(Scenario) end).

% simple_couch_db_doc_behavior:in_case(single_process).
in_case(single_process) ->
    Seq = lists:seq(1, 30000),
    Try = fun(_) -> read_write() end,
    lists:foreach(Try, Seq);

% simple_couch_db_doc_behavior:in_case(spawned_processes).
in_case(spawned_processes) ->
    Seq = lists:seq(1, 5000),
    Try = fun(_) ->
         spawn(fun() -> read_write() end)
    end,
    lists:foreach(Try, Seq);

% simple_couch_db_doc_behavior:in_case(spawned_update_processes).
in_case(spawned_update_processes) ->
    Seq = lists:seq(1, 30000),
    Try = fun(_) ->
         Doc = read(),
         spawn(fun() -> write(Doc) end)
    end,
    lists:foreach(Try, Seq).