%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2008-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
%%----------------------------------------------------------------------
%% megaco_profile: Utility module used for megaco profiling
%%----------------------------------------------------------------------
-module(megaco_profile).
-export([profile/2, prepare/2, analyse/1,
fprof_to_calltree/1, fprof_to_calltree/2, fprof_to_calltree/3]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Execute Fun and profile it with fprof.
profile(Slogan, Fun) when is_function(Fun, 0) ->
Pids = [self()],
{ok, TraceFile} = prepare(Slogan, Pids),
Res = (catch Fun()),
{ok, _DestFile} = analyse(Slogan),
ok = file:delete(TraceFile),
{ok, _TreeFile} = fprof_to_calltree(Slogan),
Res.
%% Prepare for tracing
prepare(Slogan, Pids) ->
TraceFile = lists:concat(["profile_", Slogan, "-fprof.trace"]),
{ok, _Pid} = fprof:start(),
erlang:garbage_collect(),
TraceOpts = [start,
{cpu_time, false},
{procs, Pids},
{file, TraceFile}
],
ok = fprof:trace(TraceOpts),
{ok, TraceFile}.
%% Stop tracing and analyse it
analyse(Slogan) ->
fprof:trace(stop),
TraceFile = lists:concat(["profile_", Slogan, "-fprof.trace"]),
DestFile = lists:concat(["profile_", Slogan, ".fprof"]),
try
case fprof:profile([{file, TraceFile}]) of
ok ->
ok = fprof:analyse([{dest, DestFile}, {totals, false}]),
{ok, DestFile};
{error, Reason} ->
{error, Reason}
end
after
fprof:stop()
end.
fprof_to_calltree(Slogan) ->
fprof_to_calltree(Slogan, 0).
fprof_to_calltree(Slogan, MinPercent) ->
DestFile = lists:concat(["profile_", Slogan, ".fprof"]),
TreeFile = lists:concat(["profile_", Slogan, ".calltree"]),
fprof_to_calltree(DestFile, TreeFile, MinPercent).
%% Create a calltree from an fprof file
fprof_to_calltree(FromFile, ToFile, MinPercent) ->
ReplyTo = self(),
Ref = make_ref(),
spawn_link(fun() ->
ReplyTo ! {Ref, do_fprof_to_calltree(FromFile, ToFile, MinPercent)}
end),
wait_for_reply(Ref).
wait_for_reply(Ref) ->
receive
{Ref, Res} ->
Res;
{'EXIT', normal} ->
wait_for_reply(Ref);
{'EXIT', Reason} ->
exit(Reason)
end.
do_fprof_to_calltree(FromFile, ToFile, MinPercent) ->
{ok, Fd} = file:open(ToFile, [write, raw]),
{ok, ConsultedFromFile} = file:consult(FromFile),
[_AnalysisOpts, [_Totals] | Terms] = ConsultedFromFile,
Processes = split_processes(Terms, [], []),
Indent = "",
Summary = collapse_processes(Processes),
{_Label, _Cnt, Acc, _Own, _Roots, Details} = Summary,
%% log(Fd, Label, Indent, Acc, {Label, Cnt, Acc, Own}, [], 0),
gen_calltree(Fd, Indent, Acc, Summary, MinPercent),
Delim = io_lib:format("\n~80..=c\n\n", [$=]),
Write =
fun(P) ->
file:write(Fd, Delim),
gen_calltree(Fd, Indent, Acc, P, MinPercent)
end,
lists:foreach(Write, Processes),
file:write(Fd, Delim),
gen_details(Fd, Acc, Details),
file:close(Fd),
{ok, ToFile}.
%% Split all fprof terms into a list of processes
split_processes([H | T], ProcAcc, TotalAcc) ->
if
is_tuple(H) ->
split_processes(T, [H | ProcAcc], TotalAcc);
is_list(H), ProcAcc =:= [] ->
split_processes(T, [H], TotalAcc);
is_list(H) ->
ProcAcc2 = rearrange_process(lists:reverse(ProcAcc)),
split_processes(T, [H], [ProcAcc2 | TotalAcc])
end;
split_processes([], [], TotalAcc) ->
lists:reverse(lists:keysort(3, TotalAcc));
split_processes([], ProcAcc, TotalAcc) ->
ProcAcc2 = rearrange_process(lists:reverse(ProcAcc)),
lists:reverse(lists:keysort(3, [ProcAcc2 | TotalAcc])).
%% Rearrange the raw process list into a more useful format
rearrange_process([[{Label, _Cnt, _Acc, _Own} | _ ] | Details]) ->
do_rearrange_process(Details, Details, Label, [], []).
do_rearrange_process([{CalledBy, Current, _Calls} | T], Orig, Label, Roots, Undefs) ->
case [{undefined, Cnt, safe_max(Acc, Own), Own} ||
{undefined, Cnt, Acc, Own} <- CalledBy] of
[] ->
do_rearrange_process(T, Orig, Label, Roots, Undefs);
NewUndefs ->
do_rearrange_process(T, Orig, Label, [Current | Roots], NewUndefs ++ Undefs)
end;
do_rearrange_process([], Details, Label, Roots, Undefs) ->
[{undefined, Cnt, Acc, Own}] = collapse_calls(Undefs, []),
Details2 = sort_details(3, Details),
{Label, Cnt, Acc, Own, lists:reverse(lists:keysort(3, Roots)), Details2}.
%% Compute a summary of the rearranged process info
collapse_processes(Processes) ->
Headers = lists:map(fun({_L, C, A, O, _R, _D}) -> {"SUMMARY", C, A, O} end,
Processes),
[{Label, Cnt, Acc, Own}] = collapse_calls(Headers, []),
Details = lists:flatmap(fun({_L, _C, _A, _O, _R, D}) -> D end, Processes),
Details2 = do_collapse_processes(sort_details(1, Details), []),
Roots = lists:flatmap(fun({_L, _C, _A, _O, R, _D}) -> R end, Processes),
RootMFAs = lists:usort([MFA || {MFA, _, _, _} <- Roots]),
Roots2 = [R || RootMFA <- RootMFAs,
{_, {MFA, _, _, _} = R, _} <- Details2,
MFA =:= RootMFA],
Roots3 = collapse_calls(Roots2, []),
{Label, Cnt, Acc, Own, Roots3, Details2}.
do_collapse_processes([{CalledBy1, {MFA, Cnt1, Acc1, Own1}, Calls1} | T1],
[{CalledBy2, {MFA, Cnt2, Acc2, Own2}, Calls2} | T2]) ->
Cnt = Cnt1 + Cnt2,
Acc = Acc1 + Acc2,
Own = Own1 + Own2,
Current = {MFA, Cnt, Acc, Own},
CalledBy0 = CalledBy1 ++ CalledBy2,
Calls0 = Calls1 ++ Calls2,
CalledBy = collapse_calls(lists:keysort(3, CalledBy0), []),
Calls = collapse_calls(lists:keysort(3, Calls0), []),
do_collapse_processes(T1, [{CalledBy, Current, Calls} | T2]);
do_collapse_processes([{CalledBy, Current, Calls} | T1],
T2) ->
do_collapse_processes(T1, [{CalledBy, Current, Calls} | T2]);
do_collapse_processes([],
T2) ->
sort_details(3, T2).
%% Reverse sort on acc field
sort_details(Pos, Details) ->
Pivot = fun({_CalledBy1, Current1, _Calls1},
{_CalledBy2, Current2, _Calls2}) ->
element(Pos, Current1) =< element(Pos, Current2)
end,
lists:reverse(lists:sort(Pivot, Details)).
%% Compute a summary from a list of call tuples
collapse_calls([{MFA, Cnt1, Acc1, Own1} | T1],
[{MFA, Cnt2, Acc2, Own2} | T2]) ->
Cnt = Cnt1 + Cnt2,
Acc = safe_sum(Acc1, Acc2),
Own = Own1 + Own2,
collapse_calls(T1, [{MFA, Cnt, Acc, Own} | T2]);
collapse_calls([{MFA, Cnt, Acc, Own} | T1],
T2) ->
collapse_calls(T1, [{MFA, Cnt, Acc, Own} | T2]);
collapse_calls([],
T2) ->
lists:reverse(lists:keysort(3, T2)).
safe_sum(Int1, Int2) ->
if
Int1 =:= undefined -> Int2;
Int2 =:= undefined -> Int1;
true -> Int1 + Int2
end.
safe_max(Int1, Int2) ->
if
Int1 =:= undefined ->
io:format("111\n", []),
Int2;
Int2 =:= undefined ->
io:format("222\n", []),
Int1;
Int2 > Int1 -> Int2;
true -> Int1
end.
%% Compute a calltree and write it to file
gen_calltree(Fd, Indent, TotalAcc, {Label, Cnt, Acc, Own, Roots, Details}, MinPercent) ->
Header = {Label, Cnt, Acc, Own},
MetaLabel = "Process",
Diff = length(Label) - length(MetaLabel),
IoList = io_lib:format("~s~s Lvl Pct Cnt Acc Own Calls => MFA\n",
[MetaLabel, lists:duplicate(Diff, $\ )]),
file:write(Fd, IoList),
log(Fd, Label, Indent, TotalAcc, Header, Roots, MinPercent),
NewIndent = " " ++ Indent,
Fun = fun({MFA, _C, _A, _O}) ->
[put_detail(Label, D) || D <- Details],
gen_calls(Fd, Label, NewIndent, TotalAcc, MFA, MinPercent)
end,
lists:foreach(Fun, Roots).
gen_calls(Fd, Label, Indent, TotalAcc, MFA, MinPercent) ->
case get_detail(Label, MFA) of
{read, {_CalledBy, Current, _Calls}} ->
log(Fd, Label, Indent, TotalAcc, Current, -1, MinPercent);
{unread, {_CalledBy, Current, Calls}} ->
log(Fd, Label, Indent, TotalAcc, Current, Calls, MinPercent),
NewIndent = " " ++ Indent,
Fun = fun({NextMFA, _, _, _}) ->
gen_calls(Fd, Label, NewIndent, TotalAcc,
NextMFA, MinPercent)
end,
lists:foreach(Fun, Calls)
end.
put_detail(Label, {_, {MFA, _, _, _}, _} = Detail) ->
put({Label, MFA}, {unread, Detail}).
get_detail(Label, MFA) ->
Val = get({Label, MFA}),
case Val of
{unread, Detail} ->
put({Label, MFA}, {read, Detail}),
Val;
{read, _Detail} ->
Val
end.
gen_details(Fd, Total, Details) ->
IoList = io_lib:format("Pct Cnt Acc Own MFA\n", []),
file:write(Fd, IoList),
do_gen_details(Fd, Total, Details).
do_gen_details(Fd, Total, [{_CalledBy, {MFA, Cnt, Acc, Own}, _Calls} | Details]) ->
MFAStr = io_lib:format("~p", [MFA]),
{_, Percent} = calc_percent(Acc, Own, Total),
IoList = io_lib:format("~3.. B% ~10.3B ~10.3f ~10.3f => ~s\n",
[Percent, Cnt, Acc, Own, MFAStr]),
file:write(Fd, IoList),
do_gen_details(Fd, Total, Details);
do_gen_details(_Fd, _Total, []) ->
ok.
log(Fd, Label, Indent, Acc, Current, Calls, MinPercent) when is_list(Calls) ->
log(Fd, Label, Indent, Acc, Current, length(Calls), MinPercent);
log(Fd, Label, Indent, Total, {MFA, Cnt, Acc, Own}, N, MinPercent) ->
{Max, Percent} = calc_percent(Acc, Own, Total),
if
Percent >= MinPercent ->
do_log(Fd, Label, Indent, Percent, MFA, Cnt, Max, Own, N);
true ->
ok
end.
do_log(Fd, Label, Indent, Percent, MFA, Cnt, Acc, Own, N) ->
MFAStr = io_lib:format("~p", [MFA]),
CallsStr = io_lib:format(" ~5.. s ", [lists:concat([N])]),
IoList = io_lib:format("~s ~3.. B "
"~s~3.. B% ~10.. B ~10.. B ~10.. B ~s => ~s\n",
[Label, length(Indent) div 2,
Indent, Percent, Cnt,
round(Acc), round(Own), CallsStr, MFAStr]),
file:write(Fd, IoList).
calc_percent(Acc, Own, Total) ->
Max = safe_max(Acc, Own),
{Max, round((Max * 100) / Total)}.
