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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1996-2009. 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%
+%%
+
+%%
+-module(mnesia_cost).
+-compile(export_all).
+
+%% This code exercises the mnesia system and produces a bunch
+%% of measurements on what various things cost
+
+-define(TIMES, 1000). %% set to at least 1000 when running for real !!
+
+%% This is the record we perform all ops on in this test
+
+-record(item, {a = 1234,
+ b = foobar,
+ c = "1.2.3.4",
+ d = {'Lennart', 'Hyland'},
+ e = true
+ }).
+
+go() ->
+ go([node() | nodes()]).
+
+go(Nodes) when hd(Nodes) == node() ->
+ {ok, Out} = file:open("MNESIA_COST", write),
+ put(out, Out),
+
+ rpc:multicall(Nodes, mnesia, lkill, []),
+ ok = mnesia:delete_schema(Nodes),
+ ok = mnesia:create_schema(Nodes),
+ rpc:multicall(Nodes, mnesia, start, []),
+ TabDef = [{attributes, record_info(fields, item)}],
+ {atomic, ok} = mnesia:create_table(item, TabDef),
+
+ round("single ram copy", "no index"),
+ {atomic, ok} = mnesia:add_table_index(item, #item.e),
+ round("single ram copy", "One index"),
+
+ {atomic, ok} = mnesia:add_table_index(item, #item.c),
+ round("single ram copy", "Two indexes"),
+
+ {atomic, ok} = mnesia:del_table_index(item, #item.e),
+ {atomic, ok} = mnesia:del_table_index(item, #item.c),
+
+ {atomic, ok} = mnesia:change_table_copy_type(item, node(), disc_copies),
+ round("single disc copy", "no index"),
+
+ {atomic, ok} = mnesia:change_table_copy_type(item, node(), ram_copies),
+
+ case length(Nodes) of
+ Len when Len < 2 ->
+ format("<WARNING> replication skipped. Too few nodes.", []);
+ _Len ->
+ N2 = lists:nth(2, Nodes),
+ {atomic, ok} = mnesia:add_table_copy(item, N2, ram_copies),
+ round("2 replicated ram copy", "no index")
+ end,
+ file:close(Out),
+ erase(out),
+ ok.
+
+round(Replication, Index) ->
+ run(Replication, Index, [write],
+ fun() -> mnesia:write(#item{}) end),
+
+
+ run(Replication, Index, [read],
+ fun() -> mnesia:read({item, 1234}) end),
+
+ run(Replication, Index, [read, write],
+ fun() -> mnesia:read({item, 1234}),
+ mnesia:write(#item{}) end),
+
+ run(Replication, Index, [wread, write],
+ fun() -> mnesia:wread({item, 1234}),
+ mnesia:write(#item{}) end),
+
+
+ run(Replication, Index, [match, write, write, write],
+ fun() -> mnesia:match_object({item, 1, '_', '_', '_', true}),
+ mnesia:write(#item{a =1}),
+ mnesia:write(#item{a =2}),
+ mnesia:write(#item{a =3}) end).
+
+
+format(F, As) ->
+ io:format(get(out), F, As).
+
+run(What, OtherInfo, Ops, F) ->
+ run(t, What, OtherInfo, Ops, F).
+
+run(How, What, OtherInfo, Ops, F) ->
+ T1 = erlang:now(),
+ statistics(runtime),
+ do_times(How, ?TIMES, F),
+ {_, RunTime} = statistics(runtime),
+ T2 = erlang:now(),
+ RealTime = subtr(T1, T2),
+ report(How, What, OtherInfo, Ops, RunTime, RealTime).
+
+report(t, What, OtherInfo, Ops, RunTime, RealTime) ->
+ format("~s, ~s, transaction call ", [What, OtherInfo]),
+ format("Ops is ", []),
+ lists:foreach(fun(Op) -> format("~w-", [Op]) end, Ops),
+
+ format("~n ~w/~w Millisecs/Trans ~w/~w MilliSecs/Operation ~n~n",
+ [RunTime/?TIMES,
+ RealTime/?TIMES,
+ RunTime/(?TIMES*length(Ops)),
+ RealTime/(?TIMES*length(Ops))]);
+
+report(dirty, What, OtherInfo, Ops, RunTime, RealTime) ->
+ format("~s, ~s, dirty calls ", [What, OtherInfo]),
+ format("Ops is ", []),
+ lists:foreach(fun(Op) -> format("~w-", [Op]) end, Ops),
+
+ format("~n ~w/~w Millisecs/Bunch ~w/~w MilliSecs/Operation ~n~n",
+ [RunTime/?TIMES,
+ RealTime/?TIMES,
+ RunTime/(?TIMES*length(Ops)),
+ RealTime/(?TIMES*length(Ops))]).
+
+
+subtr(Before, After) ->
+ E =(element(1,After)*1000000000000
+ +element(2,After)*1000000+element(3,After)) -
+ (element(1,Before)*1000000000000
+ +element(2,Before)*1000000+element(3,Before)),
+ E div 1000.
+
+do_times(t, I, F) ->
+ do_trans_times(I, F);
+do_times(dirty, I, F) ->
+ do_dirty(I, F).
+
+do_trans_times(I, F) when I /= 0 ->
+ {atomic, _} = mnesia:transaction(F),
+ do_trans_times(I-1, F);
+do_trans_times(_,_) -> ok.
+
+do_dirty(I, F) when I /= 0 ->
+ F(),
+ do_dirty(I-1, F);
+do_dirty(_,_) -> ok.
+
+
+
+table_load([N1,N2| _ ] = Ns) ->
+ Nodes = [N1,N2],
+ rpc:multicall(Ns, mnesia, lkill, []),
+ ok = mnesia:delete_schema(Ns),
+ ok = mnesia:create_schema(Nodes),
+ rpc:multicall(Nodes, mnesia, start, []),
+ TabDef = [{disc_copies,[N1]},{ram_copies,[N2]},
+ {attributes,record_info(fields,item)},{record_name,item}],
+ Tabs = [list_to_atom("tab" ++ integer_to_list(I)) || I <- lists:seq(1,400)],
+
+ [mnesia:create_table(Tab,TabDef) || Tab <- Tabs],
+
+%% InitTab = fun(Tab) ->
+%% mnesia:write_lock_table(Tab),
+%% InitRec = fun(Key) -> mnesia:write(Tab,#item{a=Key},write) end,
+%% lists:foreach(InitRec, lists:seq(1,100))
+%% end,
+%%
+%% {Time,{atomic,ok}} = timer:tc(mnesia,transaction, [fun() ->lists:foreach(InitTab, Tabs) end]),
+ mnesia:dump_log(),
+%% io:format("Init took ~p msec ~n", [Time/1000]),
+ rpc:call(N2, mnesia, stop, []), timer:sleep(1000),
+ mnesia:stop(), timer:sleep(500),
+ %% Warmup
+ ok = mnesia:start([{no_table_loaders, 1}]),
+ timer:tc(mnesia, wait_for_tables, [Tabs, infinity]),
+ mnesia:dump_log(),
+ rpc:call(N2, mnesia, dump_log, []),
+ io:format("Initialized ~n",[]),
+
+ mnesia:stop(), timer:sleep(1000),
+ ok = mnesia:start([{no_table_loaders, 1}]),
+ {T1, ok} = timer:tc(mnesia, wait_for_tables, [Tabs, infinity]),
+ io:format("Loading from disc with 1 loader ~p msec~n",[T1/1000]),
+ mnesia:stop(), timer:sleep(1000),
+ ok = mnesia:start([{no_table_loaders, 4}]),
+ {T2, ok} = timer:tc(mnesia, wait_for_tables, [Tabs, infinity]),
+ io:format("Loading from disc with 4 loader ~p msec~n",[T2/1000]),
+
+ %% Warmup
+ rpc:call(N2, ?MODULE, remote_load, [Tabs,4]),
+ io:format("Initialized ~n",[]),
+
+
+ T3 = rpc:call(N2, ?MODULE, remote_load, [Tabs,1]),
+ io:format("Loading from net with 1 loader ~p msec~n",[T3/1000]),
+
+ T4 = rpc:call(N2, ?MODULE, remote_load, [Tabs,4]),
+ io:format("Loading from net with 4 loader ~p msec~n",[T4/1000]),
+
+ ok.
+
+remote_load(Tabs,Loaders) ->
+ ok = mnesia:start([{no_table_loaders, Loaders}]),
+%% io:format("~p ~n", [mnesia_controller:get_info(500)]),
+ {Time, ok} = timer:tc(mnesia, wait_for_tables, [Tabs, infinity]),
+ timer:sleep(1000), mnesia:stop(), timer:sleep(1000),
+ Time.
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