The R13B03 release.OTP_R13B03

1 files changed, 692 insertions, 0 deletions

diff --git a/lib/megaco/test/megaco_load_test.erl b/lib/megaco/test/megaco_load_test.erl
new file mode 100644
index 0000000000..5a22b7b4ee
--- /dev/null
+++ b/lib/megaco/test/megaco_load_test.erl
@@ -0,0 +1,692 @@
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 2003-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+
+%%
+%%----------------------------------------------------------------------
+%% Purpose: Verify the application specifics of the Megaco application
+%%----------------------------------------------------------------------
+-module(megaco_load_test).
+
+-compile(export_all).
+
+-include("megaco_test_lib.hrl").
+-include_lib("megaco/include/megaco.hrl").
+-include_lib("megaco/include/megaco_message_v1.hrl").
+
+-define(TEST_VERBOSITY, debug).
+-define(MGC_VERBOSITY,  silence).
+-define(MG_VERBOSITY,   silence).
+
+-define(SINGLE_USER_LOAD_NUM_REQUESTS, 1000).
+-define(MULTI_USER_LOAD_NUM_REQUESTS,  1000).
+
+-define(MGC_START(Pid, Mid, ET, Conf, Verb), 
+        megaco_test_mgc:start(Pid, Mid, ET, 
+			      [{megaco_trace, false}] ++ Conf, Verb)).
+-define(MGC_STOP(Pid), megaco_test_mgc:stop(Pid)).
+-define(MGC_USER_INFO(Pid,Tag), megaco_test_mgc:user_info(Pid,Tag)).
+-define(MGC_CONN_INFO(Pid,Tag), megaco_test_mgc:conn_info(Pid,Tag)).
+-define(MGC_SET_VERBOSITY(Pid, V), megaco_test_mgc:verbosity(Pid, V)).
+
+-define(MG_START(Pid, Mid, Enc, Transp, Conf, Verb), 
+        megaco_test_mg:start(Pid, Mid, Enc, Transp, 
+			     [{megaco_trace, false},
+			      {transport_opts, [{serialize, true}]}] ++ Conf, 
+			     Verb)).
+-define(MG_STOP(Pid), megaco_test_mg:stop(Pid)).
+-define(MG_USER_INFO(Pid,Tag), megaco_test_mg:user_info(Pid,Tag)).
+-define(MG_CONN_INFO(Pid,Tag), megaco_test_mg:conn_info(Pid,Tag)).
+-define(MG_SERV_CHANGE(Pid), megaco_test_mg:service_change(Pid)).
+-define(MG_MLOAD(Pid, NL, NR), 
+	timer:tc(megaco_test_mg, apply_multi_load, [Pid, NL, NR])).
+-define(MG_LOAD(Pid, NL, NR), megaco_test_mg:apply_multi_load(Pid, NL, NR)).
+-define(MG_SET_VERBOSITY(Pid, V), megaco_test_mg:verbosity(Pid, V)).
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+
+t()     -> megaco_test_lib:t(?MODULE).
+t(Case) -> megaco_test_lib:t({?MODULE, Case}).
+
+min(M) -> timer:minutes(M).
+
+%% Test server callbacks
+init_per_testcase(single_user_light_load = Case, Config) ->
+    C = lists:keydelete(tc_timeout, 1, Config),
+    do_init_per_testcase(Case, [{tc_timeout, min(2)}|C]);
+init_per_testcase(single_user_medium_load = Case, Config) ->
+    C = lists:keydelete(tc_timeout, 1, Config),
+    do_init_per_testcase(Case, [{tc_timeout, min(5)}|C]);
+init_per_testcase(single_user_heavy_load = Case, Config) ->
+    C = lists:keydelete(tc_timeout, 1, Config),
+    do_init_per_testcase(Case, [{tc_timeout, min(10)}|C]);
+init_per_testcase(single_user_extreme_load = Case, Config) ->
+    C = lists:keydelete(tc_timeout, 1, Config),
+    do_init_per_testcase(Case, [{tc_timeout, min(20)}|C]);
+init_per_testcase(multi_user_light_load = Case, Config) ->
+    C = lists:keydelete(tc_timeout, 1, Config),
+    do_init_per_testcase(Case, [{tc_timeout, min(2)}|C]);
+init_per_testcase(multi_user_medium_load = Case, Config) ->
+    C = lists:keydelete(tc_timeout, 1, Config),
+    do_init_per_testcase(Case, [{tc_timeout, min(5)}|C]);
+init_per_testcase(multi_user_heavy_load = Case, Config) ->
+    C = lists:keydelete(tc_timeout, 1, Config),
+    do_init_per_testcase(Case, [{tc_timeout, min(10)}|C]);
+init_per_testcase(multi_user_extreme_load = Case, Config) ->
+    C = lists:keydelete(tc_timeout, 1, Config),
+    do_init_per_testcase(Case, [{tc_timeout, min(20)}|C]);
+init_per_testcase(Case, Config) ->
+    do_init_per_testcase(Case, Config).
+
+do_init_per_testcase(Case, Config) ->
+    process_flag(trap_exit, true),
+    megaco_test_lib:init_per_testcase(Case, Config).
+    
+fin_per_testcase(Case, Config) ->
+    process_flag(trap_exit, false),
+    megaco_test_lib:fin_per_testcase(Case, Config).
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+all(suite) ->
+    Cases = 
+	[
+ 	 single_user_light_load,
+ 	 single_user_medium_load,
+ 	 single_user_heavy_load,
+ 	 single_user_extreme_load,
+ 	 multi_user_light_load,
+ 	 multi_user_medium_load,
+  	 multi_user_heavy_load,
+ 	 multi_user_extreme_load
+	],
+    Cases.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+single_user_light_load(suite) ->
+    [];
+single_user_light_load(doc) ->
+    [];
+single_user_light_load(Config) when is_list(Config) ->
+    put(verbosity, ?TEST_VERBOSITY),
+    put(tc,        single_user_light_load),
+    put(sname,     "TEST"),
+    i("starting"),
+
+    load_controller(Config, 
+		    fun(Env) -> 
+			    populate(Env), 
+			    exit( single_user_load(5) ) 
+		    end),
+
+    i("done", []),
+    ok.
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+single_user_medium_load(suite) ->
+    [];
+single_user_medium_load(doc) ->
+    [];
+single_user_medium_load(Config) when is_list(Config) ->
+    put(verbosity, ?TEST_VERBOSITY),
+    put(tc,        single_user_medium_load),
+    put(sname,     "TEST"),
+    i("starting"),
+
+    load_controller(Config, 
+		    fun(Env) -> 
+			    populate(Env), 
+			    exit( single_user_load(15) ) 
+		    end),
+
+    i("done", []),
+    ok.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+single_user_heavy_load(suite) ->
+    [];
+single_user_heavy_load(doc) ->
+    [];
+single_user_heavy_load(Config) when is_list(Config) ->
+    put(verbosity, ?TEST_VERBOSITY),
+    put(tc,        single_user_heavy_load),
+    put(sname,     "TEST"),
+    i("starting"),
+
+    load_controller(Config, 
+		    fun(Env) -> 
+			    populate(Env), 
+			    exit( single_user_load(25) ) 
+		    end),
+
+    i("done", []),
+    ok.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+single_user_extreme_load(suite) ->
+    [];
+single_user_extreme_load(doc) ->
+    [];
+single_user_extreme_load(Config) when is_list(Config) ->
+    put(verbosity, ?TEST_VERBOSITY),
+    put(tc,        single_user_extreme_load),
+    put(sname,     "TEST"),
+    i("starting"),
+
+    load_controller(Config, 
+		    fun(Env) -> 
+			    populate(Env), 
+			    exit( single_user_load(100) ) 
+		    end),
+
+    i("done", []),
+    ok.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+multi_user_light_load(suite) ->
+    [];
+multi_user_light_load(doc) ->
+    [];
+multi_user_light_load(Config) when is_list(Config) ->
+    put(verbosity, ?TEST_VERBOSITY),
+    put(tc,        multi_user_light_load),
+    put(sname,     "TEST"),
+    i("starting"),
+
+    load_controller(Config, 
+		    fun(Env) -> 
+			    populate(Env), 
+			    exit( multi_user_load(3,1) ) 
+		    end),
+
+    i("done", []),
+    ok.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+multi_user_medium_load(suite) ->
+    [];
+multi_user_medium_load(doc) ->
+    [];
+multi_user_medium_load(Config) when is_list(Config) ->
+    put(verbosity, ?TEST_VERBOSITY),
+    put(tc,        multi_user_medium_load),
+    put(sname,     "TEST"),
+    i("starting"),
+
+    load_controller(Config, 
+		    fun(Env) -> 
+			    populate(Env), 
+			    exit( multi_user_load(3,5) ) 
+		    end),
+
+    i("done", []),
+    ok.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+multi_user_heavy_load(suite) ->
+    [];
+multi_user_heavy_load(doc) ->
+    [];
+multi_user_heavy_load(Config) when is_list(Config) ->
+    put(verbosity, ?TEST_VERBOSITY),
+    put(tc,        multi_user_heavy_load),
+    put(sname,     "TEST"),
+    i("starting"),
+
+    load_controller(Config, 
+		    fun(Env) -> 
+			    populate(Env), 
+			    exit( multi_user_load(3,10) ) 
+		    end),
+
+    i("done", []),
+    ok.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+multi_user_extreme_load(suite) ->
+    [];
+multi_user_extreme_load(doc) ->
+    [];
+multi_user_extreme_load(Config) when is_list(Config) ->
+    put(verbosity, ?TEST_VERBOSITY),
+    put(tc,        multi_user_extreme_load),
+    put(sname,     "TEST"),
+    i("starting"),
+
+    load_controller(Config, 
+		    fun(Env) -> 
+			    populate(Env), 
+			    exit( multi_user_load(3,15) ) 
+		    end),
+
+    i("done", []),
+    ok.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+populate([]) ->
+    ok;
+populate([{Key,Val}|Env]) ->
+    put(Key, Val),
+    populate(Env).
+
+load_controller(Config, Fun) when is_list(Config) and is_function(Fun) ->
+    process_flag(trap_exit, true),
+    {value, {tc_timeout, TcTimeout}} = 
+	lists:keysearch(tc_timeout, 1, Config),
+    SkipTimeout = trunc(95*TcTimeout/100), % 95% of TcTimeout
+    Env = get(),
+    Loader = erlang:spawn_link(fun() -> Fun(Env) end),
+    receive
+	{'EXIT', Loader, normal} ->
+	    d("load_controller -> "
+	      "loader [~p] terminated with normal", [Loader]),
+	    ok;
+	{'EXIT', Loader, ok} ->
+	    d("load_controller -> "
+	      "loader [~p] terminated with ok~n", [Loader]),
+	    ok;
+	{'EXIT', Loader, Reason} ->
+	    i("load_controller -> "
+	      "loader [~p] terminated with"
+	      "~n   ~p", [Loader, Reason]),
+	    erlang:error({unexpected_loader_result, Reason})
+    after SkipTimeout ->
+	    i("load_controller -> "
+	      "loader [~p] timeout", [Loader]),
+	    exit(Loader, kill),
+	    ?SKIP({timeout, SkipTimeout, TcTimeout})
+    end.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+single_user_load(NumLoaders) ->
+    MgcNode = make_node_name(mgc),
+    MgNode  = make_node_name(mg),
+    d("Nodes: "
+      "~n   MgcNode: ~p"
+      "~n   MgNode:  ~p", [MgcNode, MgNode]),
+    ok = megaco_test_lib:start_nodes([MgcNode, MgNode], ?FILE, ?LINE),
+
+    %% Start the MGC and MGs
+    i("[MGC] start"),
+    MgcMid = {deviceName, "ctrl"},
+    ET     = [{text, tcp, [{serialize, true}]}],
+    DSI = maybe_display_system_info(NumLoaders),
+    {ok, Mgc} = ?MGC_START(MgcNode, MgcMid, ET, DSI, ?MGC_VERBOSITY),
+
+    i("[MG] start"),
+    MgMid = {deviceName, "mg"},
+    {ok, Mg} = ?MG_START(MgNode, MgMid, text, tcp, DSI, ?MG_VERBOSITY),
+
+    d("MG user info: ~p", [?MG_USER_INFO(Mg, all)]),
+
+    i("[MG] connect to the MGC (service change)"),    
+    ServChRes = ?MG_SERV_CHANGE(Mg),
+    d("service change result: ~p", [ServChRes]),
+
+    megaco_test_mg:update_conn_info(Mg,reply_timer,1000),
+    megaco_test_mgc:update_conn_info(Mgc,reply_timer,1000),
+
+    d("MG conn info: ~p", [?MG_CONN_INFO(Mg, all)]),
+
+    d("apply the load"),
+    Res = ?MG_MLOAD(Mg, NumLoaders, ?SINGLE_USER_LOAD_NUM_REQUESTS),
+    case Res of
+	{Time, {ok, Ok, Err}} ->
+	    Sec = Time / 1000000,
+	    io:format("~nmultiple loaders result: ~n"
+		      "   Number of successfull: ~w~n"
+		      "   Number of failure:     ~w~n"
+		      "   Time:                  ~w seconds~n"
+		      "   Calls / seconds        ~w~n~n", 
+		      [Ok, Err, Sec, (NumLoaders * ?SINGLE_USER_LOAD_NUM_REQUESTS)/Sec]);
+	{Time, Error} ->
+	    io:format("SUL: multiple loaders failed: ~p after ~w~n", 
+		      [Error, Time])
+    end,
+
+    i("flush the message queue: ~p", [megaco_test_lib:flush()]),
+    
+    i("verbosity to trace"),
+    ?MGC_SET_VERBOSITY(Mgc, debug),
+    ?MG_SET_VERBOSITY(Mg, debug),
+
+    %% Tell MG to stop
+    i("[MG] stop"),
+    ?MG_STOP(Mg),
+
+    i("flush the message queue: ~p", [megaco_test_lib:flush()]),
+
+    %% Tell Mgc to stop
+    i("[MGC] stop"),
+    ?MGC_STOP(Mgc),
+
+    i("flush the message queue: ~p", [megaco_test_lib:flush()]),
+    
+    ok.
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+multi_user_load(NumUsers, NumLoaders) 
+  when (is_integer(NumUsers) andalso (NumUsers > 1) andalso 
+	is_integer(NumLoaders) andalso (NumLoaders >= 1)) ->
+    MgcNode = make_node_name(mgc),
+    MgNodes = make_node_names(mg, NumUsers),
+    d("Nodes: "
+      "~n   MgcNode: ~p"
+      "~n   MgNodes: ~p", [MgcNode, MgNodes]),
+    ok = megaco_test_lib:start_nodes([MgcNode| MgNodes], ?FILE, ?LINE),
+
+    %% Start the MGC and MGs
+    i("[MGC] start"),
+    MgcMid = {deviceName, "ctrl"},
+    ET     = [{text, tcp, [{serialize, false}]}],
+    DSI = maybe_display_system_info(2 * NumUsers * NumLoaders),
+    {ok, Mgc} = ?MGC_START(MgcNode, MgcMid, ET, DSI, ?MGC_VERBOSITY),
+
+    megaco_test_mgc:update_user_info(Mgc,reply_timer,1000),
+    d("MGC user info: ~p", [?MGC_USER_INFO(Mgc, all)]),
+
+    MgUsers = make_mids(MgNodes),
+
+    d("start MGs, apply the load and stop MGs"),
+    ok = multi_load(MgUsers, DSI, NumLoaders, ?MULTI_USER_LOAD_NUM_REQUESTS),
+
+    i("flush the message queue: ~p", [megaco_test_lib:flush()]),
+
+    ?MGC_SET_VERBOSITY(Mgc, debug),
+
+    %% Tell Mgc to stop
+    i("[MGC] stop"),
+    ?MGC_STOP(Mgc),
+
+    i("flush the message queue: ~p", [megaco_test_lib:flush()]),
+
+    ok.
+
+
+multi_load(MGs, DSI, NumLoaders, NumReqs) ->
+    d("multi_load -> entry with"
+      "~n   MGs:        ~p"
+      "~n   DSI:        ~p"
+      "~n   NumLoaders: ~p"
+      "~n   NumReqs:    ~p", [MGs, DSI, NumLoaders, NumReqs]),
+
+    Pids = multi_load_collector_start(MGs, DSI, NumLoaders, NumReqs, []),
+    case timer:tc(?MODULE, do_multi_load, [Pids, NumLoaders, NumReqs]) of
+	{Time, {ok, OKs, []}} ->
+	    Sec = Time / 1000000,
+	    multi_load_collector_calc(Sec, OKs);
+	{Time, Error} ->
+	    Sec = Time/1000000,
+	    io:format("~nmulti load failed after ~.1f:~n~p~n~n", [Sec,Error]),
+	    {error, Error}
+    end.
+
+do_multi_load(Pids, _NumLoaders, _NumReqs) ->
+    Fun = 
+	fun({P,_}) -> 
+		d("apply multi load for ~p", [P]),
+		P ! {apply_multi_load, self()} 
+	end,
+    lists:foreach(Fun, Pids),
+    await_multi_load_collectors(Pids, [], []).
+
+multi_load_collector_start([], _DSI, _NumLoaders, _NumReqs, Pids) ->
+    Pids;
+multi_load_collector_start([{Mid, Node}|MGs], DSI, NumLoaders, NumReqs, Pids) ->
+    Env = get(),
+    Pid = spawn_link(?MODULE, multi_load_collector, 
+		     [self(), Node, Mid, DSI, NumLoaders, NumReqs, Env]),
+    multi_load_collector_start(MGs, DSI, NumLoaders, NumReqs, [{Pid,Mid}|Pids]).
+
+get_env(Key, Env) ->
+    case lists:keysearch(Key, 1, Env) of
+	{value, {Key, Val}} ->
+	    Val;
+	_ ->
+	    undefined
+    end.
+
+multi_load_collector(Parent, Node, Mid, DSI, NumLoaders, NumReqs, Env) ->
+    put(verbosity, get_env(verbosity, Env)),
+    put(tc, get_env(tc, Env)),
+    put(sname, get_env(sname, Env) ++ "-loader"),
+    case ?MG_START(Node, Mid, text, tcp, DSI, ?MG_VERBOSITY) of
+	{ok, Pid} ->
+	    d("MG ~p user info: ~n~p", [Mid, ?MG_USER_INFO(Pid,all)]),
+	    ServChRes = ?MG_SERV_CHANGE(Pid),
+	    d("service change result: ~p", [ServChRes]),
+	    megaco_test_mg:update_conn_info(Pid,reply_timer,1000),
+	    d("MG ~p conn info: ~p", [Mid, ?MG_CONN_INFO(Pid,all)]),
+	    multi_load_collector_loop(Parent, Pid, Mid, NumLoaders, NumReqs);
+	Else ->
+	    Parent ! {load_start_failed, self(), Mid, Else}
+    end.
+
+multi_load_collector_loop(Parent, Pid, Mid, NumLoaders, NumReqs) ->
+    d("multi_load_collector_loop -> entry with"
+      "~n   Parent:     ~p"
+      "~n   Pid:        ~p"
+      "~n   Mid:        ~p"
+      "~n   NumLoaders: ~p"
+      "~n   NumReqs:    ~p"
+      "~nwhen"
+      "~n   self():     ~p"
+      "~n   node():     ~p", 
+      [Parent, Pid, Mid, NumLoaders, NumReqs, self(), node()]),
+    receive
+	{apply_multi_load, Parent} ->
+	    Res = ?MG_LOAD(Pid, NumLoaders, NumReqs),
+	    Parent ! {load_complete, self(), Mid, Res},
+	    ?MG_SET_VERBOSITY(Pid, debug),
+	    ?MG_STOP(Pid),
+	    exit(normal)
+    end.    
+    
+
+await_multi_load_collectors([], Oks, Errs) ->
+    i("await_multi_load_collectors -> done"),
+    {ok, Oks, Errs};
+await_multi_load_collectors(Pids, Oks, Errs) ->
+    receive
+	{load_complete, Pid, Mg, {ok, Ok, Err}} ->
+	    i("await_multi_load_collectors -> "
+	      "received ok complete from "
+	      "~n   ~p [~p]", [Pid, Mg]),
+	    Pids2 = lists:keydelete(Pid, 1, Pids),
+	    Oks2  = [{Mg, Ok, Err}|Oks],
+	    await_multi_load_collectors(Pids2, Oks2, Errs);
+	{load_complete, Pid, Mg, Error} ->
+	    i("await_multi_load_collectors -> "
+	      "received error complete from "
+	      "~n   ~p [~p]: "
+	      "~n   ~p", [Pid, Mg, Error]),
+	    Pids2 = lists:keydelete(Pid, 1, Pids),
+	    Errs2 = [{Mg, Error}|Errs],
+	    await_multi_load_collectors(Pids2, Oks, Errs2);
+
+	{'EXIT', Pid, normal} ->
+	    %% This is assumed to be one of the collectors
+	    i("await_multi_load_collectors -> "
+	      "received (normal) exit signal from ~p", [Pid]),
+	    await_multi_load_collectors(Pids, Oks, Errs);
+
+	{'EXIT', Pid, Reason} ->
+	    i("await_multi_load_collectors -> "
+	      "received unexpected exit from ~p:"
+	      "~n   ~p", [Pid, Reason]),
+	    case lists:keydelete(Pid, 1, Pids) of
+		Pids ->
+		    %% Not one of my procs, or a proc I have already
+		    %% received a complete from.
+		    await_multi_load_collectors(Pids, Oks, Errs);
+		Pids2 ->
+		    [{Pid,Mg}] = Pids -- Pids2,
+		    Errs2 = [{Mg, {unexpected_exit, Reason}}|Errs],
+		    await_multi_load_collectors(Pids, Oks, Errs2)
+	    end;
+
+	Else ->
+	    i("await_multi_load_collectors -> received unexpected message:"
+	      "~n~p", [Else]),
+	    await_multi_load_collectors(Pids, Oks, Errs)
+    after 
+	5000 ->
+	    i("await_multi_load_collectors -> still awaiting reply from:"
+	      "~n~p", [Pids]),
+	    await_multi_load_collectors(Pids, Oks, Errs)
+    end.
+	    
+		
+%% Note that this is an approximation...we run all the
+%% MGs in parrallel, so it should be "accurate"...
+multi_load_collector_calc(Sec, Oks) ->
+    Succs = lists:sum([Ok   || {_, Ok,   _} <- Oks]),
+    Fails = lists:sum([Err  || {_,  _, Err} <- Oks]),
+    io:format("~ntotal multiple loaders result: ~n"
+	      "   Number of successfull: ~w~n"
+	      "   Number of failure:     ~w~n"
+	      "   Total Calls / seconds: ~.2f~n~n", 
+	      [Succs, Fails, Sec]),
+    ok.
+    
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+make_node_names(Name, Num) ->
+    make_node_names(Name, Num, []).
+
+make_node_names(_, 0, Names) ->
+    Names;
+make_node_names(BaseName, N, Names) ->
+    Name = lists:flatten(io_lib:format("~p~w", [BaseName,N])),
+    make_node_names(BaseName, N-1, [make_node_name(Name)|Names]).
+
+make_node_name(Name) when is_atom(Name) ->
+    make_node_name(atom_to_list(Name));
+make_node_name(Name) when is_list(Name) ->
+    case string:tokens(atom_to_list(node()), [$@]) of
+	[_,Host] ->
+	    list_to_atom(lists:concat([Name ++ "@" ++ Host]));
+	_ ->
+	    exit("Test node must be started with '-sname'")
+     end.
+
+make_mids(MgNodes) when is_list(MgNodes) andalso (length(MgNodes) > 0) ->
+    make_mids(MgNodes, []).
+
+make_mids([], Mids) ->
+    lists:reverse(Mids);
+make_mids([MgNode|MgNodes], Mids) ->
+    case string:tokens(atom_to_list(MgNode), [$@]) of
+	[Name, _] ->
+	    Mid = {deviceName, Name},
+	    make_mids(MgNodes, [{Mid, MgNode}|Mids]);
+	_Else ->
+	    exit("Test node must be started with '-sname'")
+    end.
+
+tim() ->
+    {A,B,C} = erlang:now(),
+    A*1000000000+B*1000+(C div 1000).
+
+sleep(X) -> receive after X -> ok end.
+
+error_msg(F,A) -> error_logger:error_msg(F ++ "~n",A).
+
+maybe_display_system_info(NumLoaders) when NumLoaders > 50 ->
+    [{display_system_info, timer:seconds(2)}];
+maybe_display_system_info(NumLoaders) when NumLoaders > 10 ->
+    [{display_system_info, timer:seconds(1)}];
+maybe_display_system_info(_) ->
+    [].
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+i(F) ->
+    i(F, []).
+
+i(F, A) ->
+    print(info, get(verbosity), now(), get(tc), "INF", F, A).
+
+d(F) ->
+    d(F, []).
+
+d(F, A) ->
+    print(debug, get(verbosity), now(), get(tc), "DBG", F, A).
+
+printable(_, debug)   -> true;
+printable(info, info) -> true;
+printable(_,_)        -> false.
+
+print(Severity, Verbosity, Ts, Tc, P, F, A) ->
+    print(printable(Severity,Verbosity), Ts, Tc, P, F, A).
+
+print(true, Ts, Tc, P, F, A) ->
+    io:format("*** [~s] ~s ~p ~s:~w ***"
+              "~n   " ++ F ++ "~n", 
+              [format_timestamp(Ts), P, self(), get(sname), Tc | A]);
+print(_, _, _, _, _, _) ->
+    ok.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+random_init() ->
+    {A,B,C} = now(),
+    random:seed(A,B,C).
+
+random() ->
+    10 * random:uniform(50).
+
+apply_load_timer() ->
+    erlang:send_after(random(), self(), apply_load_timeout).
+
+format_timestamp({_N1, _N2, N3} = Now) ->
+    {Date, Time}   = calendar:now_to_datetime(Now),
+    {YYYY,MM,DD}   = Date,
+    {Hour,Min,Sec} = Time,
+    FormatDate = 
+        io_lib:format("~.4w:~.2.0w:~.2.0w ~.2.0w:~.2.0w:~.2.0w 4~w",
+                      [YYYY,MM,DD,Hour,Min,Sec,round(N3/1000)]),  
+    lists:flatten(FormatDate).