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authorBjörn Gustavsson <bjorn@erlang.org>2010-12-15 15:20:50 +0100
committerBjörn Gustavsson <bjorn@erlang.org>2011-01-17 15:23:36 +0100
commite993388497b70f923d57b59a718ee37c4d964612 (patch)
tree5ccaefc053d8ebbd3a59e7d54634babc02672ac1 /erts/emulator
parent6ce5ab74806d044070768175f48605bab7fa079d (diff)
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Add utils/count for counting the static instruction frequency
Diffstat (limited to 'erts/emulator')
-rwxr-xr-xerts/emulator/utils/count127
1 files changed, 127 insertions, 0 deletions
diff --git a/erts/emulator/utils/count b/erts/emulator/utils/count
new file mode 100755
index 0000000000..617f5c25e8
--- /dev/null
+++ b/erts/emulator/utils/count
@@ -0,0 +1,127 @@
+%% -*- erlang -*-
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1998-2010. 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%
+%%
+
+-mode(compile).
+
+main(_) ->
+ DisDir = "./dis",
+ ok = filelib:ensure_dir(filename:join(DisDir, "dummy")),
+ io:format("Dissambling to ~s\n", [DisDir]),
+ ok = file:set_cwd(DisDir),
+ Path = code:get_path() -- ["."],
+ Beams0 = [filelib:wildcard(filename:join(Dir, "*.beam")) ||
+ Dir <- Path],
+ Beams = lists:append(Beams0),
+ Mods0 = [list_to_atom(filename:rootname(filename:basename(F))) ||
+ F <- Beams],
+ Mods = lists:usort(Mods0),
+ start_sem(),
+ Ps = [begin
+ {_,Ref} = spawn_monitor(fun() -> count(M) end),
+ Ref
+ end || M <- Mods],
+ [put(list_to_atom(I), 0) || I <- erts_debug:instructions()],
+ Res = wait_for_all(Ps, 1),
+ OutFile = "count",
+ {ok,Out} = file:open(OutFile, [write]),
+ [io:format(Out, "~s ~p\n", [I,C]) || {I,C} <- Res],
+ ok = file:close(Out),
+ io:format("\nResult written to ~s\n",
+ [filename:join(DisDir, OutFile)]),
+ ok.
+
+wait_for_all([], _) ->
+ lists:reverse(lists:keysort(2, get()));
+wait_for_all([_|_]=Ps, I) ->
+ receive
+ {'DOWN',Ref,process,_,Result} ->
+ io:format("\r~p", [I]),
+ [increment(Key, Count) || {Key,Count} <- Result],
+ wait_for_all(Ps -- [Ref], I+1)
+ end.
+
+count(M) ->
+ down(),
+ erts_debug:df(M),
+ {ok,Fd} = file:open(atom_to_list(M) ++ ".dis", [read,raw]),
+ count_is(Fd),
+ ok = file:close(Fd),
+ exit(get()).
+
+count_is(Fd) ->
+ case file:read_line(Fd) of
+ {ok,Line} ->
+ count_instr(Line),
+ count_is(Fd);
+ eof ->
+ ok
+ end.
+
+count_instr([$\s|T]) ->
+ count_instr_1(T, []);
+count_instr([_|T]) ->
+ count_instr(T);
+count_instr([]) ->
+ %% Empty line.
+ ok.
+
+count_instr_1([$\s|_], Acc) ->
+ Instr = list_to_atom(lists:reverse(Acc)),
+ increment(Instr, 1);
+count_instr_1([H|T], Acc) ->
+ count_instr_1(T, [H|Acc]).
+
+increment(Key, Inc) ->
+ case get(Key) of
+ undefined ->
+ put(Key, Inc);
+ Count ->
+ put(Key, Count+Inc)
+ end.
+
+%%%
+%%% Counting sempahore to limit the number of processes that
+%%% can run concurrently.
+%%%
+
+down() ->
+ sem ! {down,self()},
+ receive
+ sem_taken -> ok
+ end.
+
+start_sem() ->
+ spawn(fun() ->
+ register(sem, self()),
+ process_flag(trap_exit, true),
+ do_sem(erlang:system_info(schedulers)+1) end).
+
+do_sem(0) ->
+ receive
+ {'EXIT',_,_} ->
+ do_sem(1)
+ end;
+do_sem(C) ->
+ receive
+ {down,Pid} ->
+ link(Pid),
+ Pid ! sem_taken,
+ do_sem(C-1)
+ end.