%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2010. 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%
%%
%%
-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.
