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authorSverker Eriksson <[email protected]>2018-01-25 19:05:50 +0100
committerSverker Eriksson <[email protected]>2018-02-12 13:23:15 +0100
commitd1e89f8df4be7197fdab36a3e1662183a7dfe6ae (patch)
tree9e5ade98862227fc30e477a8403f3e313e70723b /erts/emulator/test
parentdefd43985282606e841e2bcb29ad7414080d5a80 (diff)
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erts: Add system_flags(erts_alloc,"+M?sbct *")
to change sbct limit in runtime for chosen allocator type. With great power comes great responsibility.
Diffstat (limited to 'erts/emulator/test')
-rw-r--r--erts/emulator/test/alloc_SUITE.erl78
1 files changed, 78 insertions, 0 deletions
diff --git a/erts/emulator/test/alloc_SUITE.erl b/erts/emulator/test/alloc_SUITE.erl
index 61d2adcbca..e4b4465c60 100644
--- a/erts/emulator/test/alloc_SUITE.erl
+++ b/erts/emulator/test/alloc_SUITE.erl
@@ -31,6 +31,7 @@
mseg_clear_cache/1,
erts_mmap/1,
cpool/1,
+ set_dyn_param/1,
migration/1]).
-include_lib("common_test/include/ct.hrl").
@@ -41,6 +42,7 @@ suite() ->
all() ->
[basic, coalesce, threads, realloc_copy, bucket_index,
+ set_dyn_param,
bucket_mask, rbtree, mseg_clear_cache, erts_mmap, cpool, migration].
init_per_testcase(Case, Config) when is_list(Config) ->
@@ -145,6 +147,82 @@ erts_mmap_do(Config, SCO, SCRPM, SCRFSD) ->
Result.
+%% Test erlang:system_flag(erts_alloc, ...)
+set_dyn_param(_Config) ->
+ {_, _, _, AlcList} = erlang:system_info(allocator),
+
+ {Enabled, Disabled, Others} =
+ lists:foldl(fun({sys_alloc,_}, {Es, Ds, Os}) ->
+ {Es, [sys_alloc | Ds], Os};
+
+ ({AT, Opts}, {Es, Ds, Os}) when is_list(Opts) ->
+ case lists:keyfind(e, 1, Opts) of
+ {e, true} ->
+ {[AT | Es], Ds, Os};
+ {e, false} ->
+ {Es, [AT | Ds], Os};
+ false ->
+ {Es, Ds, [AT | Os]}
+ end;
+
+ (_, Acc) -> Acc
+ end,
+ {[], [], []},
+ AlcList),
+
+ Param = sbct,
+ lists:foreach(fun(AT) -> set_dyn_param_enabled(AT, Param) end,
+ Enabled),
+
+ lists:foreach(fun(AT) ->
+ Tpl = {AT, Param, 12345},
+ io:format("~p\n", [Tpl]),
+ notsup = erlang:system_flag(erts_alloc, Tpl)
+ end,
+ Disabled),
+
+ lists:foreach(fun(AT) ->
+ Tpl = {AT, Param, 12345},
+ io:format("~p\n", [Tpl]),
+ {'EXIT',{badarg,_}} =
+ (catch erlang:system_flag(erts_alloc, Tpl))
+ end,
+ Others),
+ ok.
+
+set_dyn_param_enabled(AT, Param) ->
+ OldVal = get_alc_param(AT, Param),
+
+ Val1 = OldVal div 2,
+ Tuple = {AT, Param, Val1},
+ io:format("~p\n", [Tuple]),
+ ok = erlang:system_flag(erts_alloc, Tuple),
+ Val1 = get_alc_param(AT, Param),
+
+ ok = erlang:system_flag(erts_alloc, {AT, Param, OldVal}),
+ OldVal = get_alc_param(AT, Param),
+ ok.
+
+get_alc_param(AT, Param) ->
+ lists:foldl(fun({instance,_,Istats}, Acc) ->
+ {options,Opts} = lists:keyfind(options, 1, Istats),
+ {Param,Val} = lists:keyfind(Param, 1, Opts),
+ {as,Strategy} = lists:keyfind(as, 1, Opts),
+
+ case {param_for_strat(Param, Strategy), Acc} of
+ {false, _} -> Acc;
+ {true, undefined} -> Val;
+ {true, _} ->
+ Val = Acc
+ end
+ end,
+ undefined,
+ erlang:system_info({allocator, AT})).
+
+param_for_strat(sbct, gf) -> false;
+param_for_strat(_, _) -> true.
+
+
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% %%
%% Internal functions %%