diff options
Diffstat (limited to 'erts/emulator/test')
| -rw-r--r-- | erts/emulator/test/scheduler_SUITE.erl | 64 |
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, |