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-rw-r--r--erts/emulator/test/time_SUITE.erl75
1 files changed, 75 insertions, 0 deletions
diff --git a/erts/emulator/test/time_SUITE.erl b/erts/emulator/test/time_SUITE.erl
index 43f7ac7f7c..d04a95b10e 100644
--- a/erts/emulator/test/time_SUITE.erl
+++ b/erts/emulator/test/time_SUITE.erl
@@ -18,6 +18,7 @@
%%
-module(time_SUITE).
+-compile({nowarn_deprecated_function, {erlang,now,0}}).
%% "Time is on my side." -- The Rolling Stones
@@ -37,6 +38,7 @@
now_unique/1, now_update/1, timestamp/1,
time_warp_modes/1,
monotonic_time_monotonicity/1,
+ monotonic_time_monotonicity_parallel/1,
time_unit_conversion/1,
signed_time_unit_conversion/1,
erlang_timestamp/1]).
@@ -79,6 +81,7 @@ all() ->
{group, now}, timestamp,
time_warp_modes,
monotonic_time_monotonicity,
+ monotonic_time_monotonicity_parallel,
time_unit_conversion,
signed_time_unit_conversion,
erlang_timestamp].
@@ -565,6 +568,78 @@ cmp_times(Done, X0) ->
cmp_times(Done, X5)
end.
+-define(NR_OF_MONOTONIC_CALLS, 100000).
+
+monotonic_time_monotonicity_parallel(Config) when is_list(Config) ->
+ Me = self(),
+ Result = make_ref(),
+ Go = make_ref(),
+ UpAndRunning = make_ref(),
+ NoOnlnScheds = erlang:system_info(schedulers_online),
+ OffsetUI = erlang:unique_integer([monotonic]),
+ OffsetMT = erlang:monotonic_time(),
+ MinHSz = ?NR_OF_MONOTONIC_CALLS*(2
+ + 3
+ + erts_debug:flat_size(OffsetUI)
+ + erts_debug:flat_size(OffsetMT)),
+ Ps = lists:map(
+ fun (Sched) ->
+ spawn_opt(
+ fun () ->
+ Me ! {self(), UpAndRunning},
+ receive Go -> ok end,
+ Res = fetch_monotonic(?NR_OF_MONOTONIC_CALLS, []),
+ Me ! {self(), Result, Sched, Res}
+ end,
+ [{scheduler, Sched},
+ {priority, max},
+ {min_heap_size, MinHSz}])
+ end,
+ lists:seq(1, NoOnlnScheds)),
+ lists:foreach(fun (P) -> receive {P, UpAndRunning} -> ok end end, Ps),
+ lists:foreach(fun (P) -> P ! Go end, Ps),
+ TMs = recv_monotonics(Result, OffsetMT, OffsetUI, NoOnlnScheds, []),
+ true = check_monotonic_result(TMs, OffsetMT, OffsetUI, true).
+
+check_monotonic_result([{_Sched, _PrevUI, _MT, _PostUI}],
+ _OffsetMT, _OffsetUI, Res) ->
+ Res;
+check_monotonic_result([{_ASched, _APrevUI, AMT, APostUI} = A,
+ {_BSched, BPrevUI, BMT, _BPostUI} = B | _] = L,
+ OffsetMT, OffsetUI, Res) ->
+ NewRes = case (AMT =< BMT) orelse (BPrevUI < APostUI) of
+ true ->
+ Res;
+ false ->
+ io:format("INCONSISTENCY: ~p ~p~n", [A, B]),
+ false
+ end,
+ check_monotonic_result(tl(L), OffsetMT, OffsetUI, NewRes).
+
+recv_monotonics(_Result, _OffsetMT, _OffsetUI, 0, Acc) ->
+ lists:keysort(2, Acc);
+recv_monotonics(Result, OffsetMT, OffsetUI, N, Acc) ->
+ receive
+ {_, Result, Sched, Res} ->
+ CRes = convert_monotonic(Sched, OffsetMT, OffsetUI, Res, []),
+ recv_monotonics(Result, OffsetMT, OffsetUI, N-1, CRes ++ Acc)
+ end.
+
+convert_monotonic(_Sched, _OffsetMT, _OffsetUI, [{_MT, _UI}], Acc) ->
+ Acc;
+convert_monotonic(Sched, OffsetMT, OffsetUI,
+ [{MT, UI}, {_PrevMT, PrevUI} | _] = L, Acc) ->
+ convert_monotonic(Sched, OffsetMT, OffsetUI, tl(L),
+ [{Sched, PrevUI-OffsetUI, MT-OffsetMT, UI-OffsetUI}
+ | Acc]).
+
+fetch_monotonic(0, Acc) ->
+ Acc;
+fetch_monotonic(N, Acc) ->
+ MT = erlang:monotonic_time(),
+ UI = erlang:unique_integer([monotonic]),
+ fetch_monotonic(N-1, [{MT, UI} | Acc]).
+
-define(CHK_RES_CONVS_TIMEOUT, 400).
time_unit_conversion(Config) when is_list(Config) ->