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-rw-r--r--erts/emulator/test/scheduler_SUITE.erl64
1 files changed, 62 insertions, 2 deletions
diff --git a/erts/emulator/test/scheduler_SUITE.erl b/erts/emulator/test/scheduler_SUITE.erl
index 8931562828..81539faa09 100644
--- a/erts/emulator/test/scheduler_SUITE.erl
+++ b/erts/emulator/test/scheduler_SUITE.erl
@@ -52,6 +52,7 @@
update_cpu_info/1,
sct_cmd/1,
sbt_cmd/1,
+ scheduler_threads/1,
scheduler_suspend/1,
reader_groups/1]).
@@ -66,7 +67,7 @@ all() ->
equal_with_part_time_max,
equal_and_high_with_part_time_max, equal_with_high,
equal_with_high_max, bound_process,
- {group, scheduler_bind}, scheduler_suspend,
+ {group, scheduler_bind}, scheduler_threads, scheduler_suspend,
reader_groups].
groups() ->
@@ -1039,7 +1040,66 @@ sbt_test(Config, CpuTCmd, ClBt, Bt, LP) ->
tuple_to_list(SB)),
?line stop_node(Node),
?line ok.
-
+
+scheduler_threads(Config) when is_list(Config) ->
+ SmpSupport = erlang:system_info(smp_support),
+ {Sched, SchedOnln, _} = get_sstate(Config, ""),
+ %% Configure half the number of both the scheduler threads and
+ %% the scheduler threads online.
+ {HalfSched, HalfSchedOnln} = case SmpSupport of
+ false -> {1,1};
+ true ->
+ {Sched div 2,
+ SchedOnln div 2}
+ end,
+ {HalfSched, HalfSchedOnln, _} = get_sstate(Config, "+SP 50:50"),
+ %% Use +S to configure 4x the number of scheduler threads and
+ %% 4x the number of scheduler threads online, but alter that
+ %% setting using +SP to 50% scheduler threads and 25% scheduler
+ %% threads online. The result should be 2x scheduler threads and
+ %% 1x scheduler threads online.
+ TwiceSched = case SmpSupport of
+ false -> 1;
+ true -> Sched*2
+ end,
+ FourSched = integer_to_list(Sched*4),
+ FourSchedOnln = integer_to_list(SchedOnln*4),
+ CombinedCmd1 = "+S "++FourSched++":"++FourSchedOnln++" +SP50:25",
+ {TwiceSched, SchedOnln, _} = get_sstate(Config, CombinedCmd1),
+ %% Now do the same test but with the +S and +SP options in the
+ %% opposite order, since order shouldn't matter.
+ CombinedCmd2 = "+SP50:25 +S "++FourSched++":"++FourSchedOnln,
+ {TwiceSched, SchedOnln, _} = get_sstate(Config, CombinedCmd2),
+ %% Apply two +SP options to make sure the second overrides the first
+ TwoCmd = "+SP 25:25 +SP 100:100",
+ {Sched, SchedOnln, _} = get_sstate(Config, TwoCmd),
+ %% Configure 50% of scheduler threads online only
+ {Sched, HalfSchedOnln, _} = get_sstate(Config, "+SP:50"),
+ %% Configure 2x scheduler threads only
+ {TwiceSched, SchedOnln, _} = get_sstate(Config, "+SP 200"),
+ %% Test resetting the scheduler counts
+ ResetCmd = "+S "++FourSched++":"++FourSchedOnln++" +S 0:0",
+ {Sched, SchedOnln, _} = get_sstate(Config, ResetCmd),
+ %% Test negative +S settings, but only for SMP-enabled emulators
+ case SmpSupport of
+ false -> ok;
+ true ->
+ SchedMinus1 = Sched-1,
+ SchedOnlnMinus1 = SchedOnln-1,
+ {SchedMinus1, SchedOnlnMinus1, _} = get_sstate(Config, "+S -1"),
+ {Sched, SchedOnlnMinus1, _} = get_sstate(Config, "+S :-1"),
+ {SchedMinus1, SchedOnlnMinus1, _} = get_sstate(Config, "+S -1:-1")
+ end,
+ ok.
+
+get_sstate(Config, Cmd) ->
+ {ok, Node} = start_node(Config, Cmd),
+ [SState] = mcall(Node, [fun () ->
+ erlang:system_info(schedulers_state)
+ end]),
+ stop_node(Node),
+ SState.
+
scheduler_suspend(Config) when is_list(Config) ->
?line Dog = ?t:timetrap(?t:minutes(5)),
?line lists:foreach(fun (S) -> scheduler_suspend_test(Config, S) end,