From c8c736e24cd92f1ec36645fe69deb48bea56b50b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Fri, 23 Apr 2010 11:46:53 +0200
Subject: erts: Add tests for the receive optimization
---
erts/emulator/test/Makefile | 1 +
erts/emulator/test/receive_SUITE.erl | 113 +++++++++++++++++++++++++++++++++++
2 files changed, 114 insertions(+)
create mode 100644 erts/emulator/test/receive_SUITE.erl
(limited to 'erts/emulator')
diff --git a/erts/emulator/test/Makefile b/erts/emulator/test/Makefile
index df2faf1450..2424fedbed 100644
--- a/erts/emulator/test/Makefile
+++ b/erts/emulator/test/Makefile
@@ -81,6 +81,7 @@ MODULES= \
port_bif_SUITE \
process_SUITE \
pseudoknot_SUITE \
+ receive_SUITE \
ref_SUITE \
register_SUITE \
save_calls_SUITE \
diff --git a/erts/emulator/test/receive_SUITE.erl b/erts/emulator/test/receive_SUITE.erl
new file mode 100644
index 0000000000..40ebf2bd21
--- /dev/null
+++ b/erts/emulator/test/receive_SUITE.erl
@@ -0,0 +1,113 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 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(receive_SUITE).
+
+%% Tests receive after.
+
+-include("test_server.hrl").
+
+-export([all/1,
+ call_with_huge_message_queue/1,receive_in_between/1]).
+
+-export([init_per_testcase/2,fin_per_testcase/2]).
+
+all(suite) ->
+ [call_with_huge_message_queue,receive_in_between].
+
+init_per_testcase(Func, Config) when is_atom(Func), is_list(Config) ->
+ Dog=?t:timetrap(?t:minutes(3)),
+ [{watchdog, Dog}|Config].
+
+fin_per_testcase(_Func, Config) ->
+ Dog=?config(watchdog, Config),
+ ?t:timetrap_cancel(Dog).
+
+call_with_huge_message_queue(Config) when is_list(Config) ->
+ ?line Pid = spawn_link(fun echo_loop/0),
+
+ ?line {Time,ok} = tc(fun() -> calls(10, Pid) end),
+
+ ?line [self() ! {msg,N} || N <- lists:seq(1, 500000)],
+ erlang:garbage_collect(),
+ ?line {NewTime,ok} = tc(fun() -> calls(10, Pid) end),
+ io:format("Time for empty message queue: ~p", [Time]),
+ io:format("Time for huge message queue: ~p", [NewTime]),
+
+ case (NewTime+1) / (Time+1) of
+ Q when Q < 10 ->
+ ok;
+ Q ->
+ io:format("Q = ~p", [Q]),
+ ?line ?t:fail()
+ end,
+ ok.
+
+calls(0, _) -> ok;
+calls(N, Pid) ->
+ {ok,{ultimate_answer,42}} = call(Pid, {ultimate_answer,42}),
+ calls(N-1, Pid).
+
+call(Pid, Msg) ->
+ Mref = erlang:monitor(process, Pid),
+ Pid ! {Mref,{self(),Msg}},
+ receive
+ {Mref, Reply} ->
+ erlang:demonitor(Mref, [flush]),
+ {ok, Reply};
+ {'DOWN', Mref, _, _, Reason} ->
+ exit(Reason)
+ end.
+
+receive_in_between(Config) when is_list(Config) ->
+ ?line Pid = spawn_link(fun echo_loop/0),
+ ?line [{ok,{a,b}} = call2(Pid, {a,b}) || _ <- lists:seq(1, 100000)],
+ ok.
+
+call2(Pid, Msg) ->
+ self() ! dummy,
+ Mref = erlang:monitor(process, Pid),
+ Pid ! {Mref,{self(),Msg}},
+ receive_one(),
+ receive
+ {Mref,Reply} ->
+ erlang:demonitor(Mref, [flush]),
+ {ok,Reply};
+ {'DOWN',Mref,_,_,Reason} ->
+ exit(Reason)
+ end.
+
+receive_one() ->
+ receive
+ dummy -> ok
+ end.
+
+%%%
+%%% Common helpers.
+%%%
+
+echo_loop() ->
+ receive
+ {Ref,{Pid,Msg}} ->
+ Pid ! {Ref,Msg},
+ echo_loop()
+ end.
+
+tc(Fun) ->
+ timer:tc(erlang, apply, [Fun,[]]).
--
cgit v1.2.3