diff options
-rw-r--r-- | erts/emulator/test/receive_SUITE.erl | 55 |
1 files changed, 35 insertions, 20 deletions
diff --git a/erts/emulator/test/receive_SUITE.erl b/erts/emulator/test/receive_SUITE.erl index 83653a7a36..c7d5a3f5a0 100644 --- a/erts/emulator/test/receive_SUITE.erl +++ b/erts/emulator/test/receive_SUITE.erl @@ -39,25 +39,43 @@ groups() -> call_with_huge_message_queue(Config) when is_list(Config) -> Pid = spawn_link(fun echo_loop/0), - - {Time,ok} = tc(fun() -> calls(10, Pid) end), - - [self() ! {msg,N} || N <- lists:seq(1, 500000)], + _WarmUpTime = time_calls(Pid), + Time = time_calls(Pid), + _ = [self() ! {msg,N} || N <- lists:seq(1, 500000)], + io:format("Time for empty message queue: ~p", [Time]), erlang:garbage_collect(), - {NewTime1,ok} = tc(fun() -> calls(10, Pid) end), - {NewTime2,ok} = tc(fun() -> calls(10, Pid) end), + call_with_huge_message_queue_1(Pid, Time, 5). + +call_with_huge_message_queue_1(_Pid, _Time, 0) -> + ct:fail(bad_ratio); +call_with_huge_message_queue_1(Pid, Time, NumTries) -> + HugeTime = time_calls(Pid), + io:format("Time for huge message queue: ~p", [HugeTime]), + + case (HugeTime+1) / (Time+1) of + Q when Q < 10 -> + ok; + Q -> + io:format("Too high ratio: ~p\n", [Q]), + call_with_huge_message_queue_1(Pid, Time, NumTries-1) + end. - io:format("Time for empty message queue: ~p", [Time]), - io:format("Time1 for huge message queue: ~p", [NewTime1]), - io:format("Time2 for huge message queue: ~p", [NewTime2]), - - case hd(lists:sort([(NewTime1+1) / (Time+1), (NewTime2+1) / (Time+1)])) of - Q when Q < 10 -> - ok; - Q -> - ct:fail("Best Q = ~p", [Q]) - end, - ok. +%% Time a number calls. Try to avoid returning a zero time. +time_calls(Pid) -> + time_calls(Pid, 10). + +time_calls(_Pid, 0) -> + 0; +time_calls(Pid, NumTries) -> + case timer:tc(fun() -> calls(Pid) end) of + {0,ok} -> + time_calls(Pid, NumTries-1); + {Time,ok} -> + Time + end. + +calls(Pid) -> + calls(100, Pid). calls(0, _) -> ok; calls(N, Pid) -> @@ -108,6 +126,3 @@ echo_loop() -> Pid ! {Ref,Msg}, echo_loop() end. - -tc(Fun) -> - timer:tc(erlang, apply, [Fun,[]]). |