%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2003-2010. 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).
end_per_testcase(Case, Config) ->
process_flag(trap_exit, false),
megaco_test_lib:end_per_testcase(Case, Config).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
all() ->
[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].
groups() ->
[].
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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).
