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-rw-r--r--erts/emulator/test/statistics_SUITE.erl65
1 files changed, 63 insertions, 2 deletions
diff --git a/erts/emulator/test/statistics_SUITE.erl b/erts/emulator/test/statistics_SUITE.erl
index 56ecf4195a..a6305d453c 100644
--- a/erts/emulator/test/statistics_SUITE.erl
+++ b/erts/emulator/test/statistics_SUITE.erl
@@ -32,7 +32,7 @@
run_queue_one/1,
scheduler_wall_time/1,
reductions/1, reductions_big/1, garbage_collection/1, io/1,
- badarg/1]).
+ badarg/1, run_queues_lengths_active_tasks/1]).
%% Internal exports.
@@ -54,7 +54,8 @@ suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[{group, wall_clock}, {group, runtime}, reductions,
reductions_big, {group, run_queue}, scheduler_wall_time,
- garbage_collection, io, badarg].
+ garbage_collection, io, badarg,
+ run_queues_lengths_active_tasks].
groups() ->
[{wall_clock, [],
@@ -409,3 +410,63 @@ badarg(Config) when is_list(Config) ->
?line case catch statistics(bad_atom) of
{'EXIT', {badarg, _}} -> ok
end.
+
+tok_loop() ->
+ tok_loop().
+
+run_queues_lengths_active_tasks(Config) ->
+ TokLoops = lists:map(fun (_) ->
+ spawn_opt(fun () ->
+ tok_loop()
+ end,
+ [link, {priority, low}])
+ end,
+ lists:seq(1,10)),
+
+ TRQLs0 = statistics(total_run_queue_lengths),
+ TATs0 = statistics(total_active_tasks),
+ true = is_integer(TRQLs0),
+ true = is_integer(TATs0),
+ true = TRQLs0 >= 0,
+ true = TATs0 >= 11,
+
+ NoScheds = erlang:system_info(schedulers),
+ RQLs0 = statistics(run_queue_lengths),
+ ATs0 = statistics(active_tasks),
+ NoScheds = length(RQLs0),
+ NoScheds = length(ATs0),
+ true = lists:sum(RQLs0) >= 0,
+ true = lists:sum(ATs0) >= 11,
+
+ SO = erlang:system_flag(schedulers_online, 1),
+
+ %% Give newly suspended schedulers some time to
+ %% migrate away work from their run queues...
+ receive after 1000 -> ok end,
+
+ TRQLs1 = statistics(total_run_queue_lengths),
+ TATs1 = statistics(total_active_tasks),
+ true = TRQLs1 >= 10,
+ true = TATs1 >= 11,
+ NoScheds = erlang:system_info(schedulers),
+
+ RQLs1 = statistics(run_queue_lengths),
+ ATs1 = statistics(active_tasks),
+ NoScheds = length(RQLs1),
+ NoScheds = length(ATs1),
+ TRQLs2 = lists:sum(RQLs1),
+ TATs2 = lists:sum(ATs1),
+ true = TRQLs2 >= 10,
+ true = TATs2 >= 11,
+ [TRQLs2|_] = RQLs1,
+ [TATs2|_] = ATs1,
+
+ erlang:system_flag(schedulers_online, SO),
+
+ lists:foreach(fun (P) ->
+ unlink(P),
+ exit(P, bang)
+ end,
+ TokLoops),
+
+ ok.