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authorIngela Anderton Andin <[email protected]>2011-02-15 16:51:38 +0100
committerIngela Anderton Andin <[email protected]>2011-02-22 11:56:36 +0100
commita51fea68bbcf341bf7857a6bd3f0c17ffd0402bb (patch)
tree78c4f9132cf5de3d2e68d56546d754e25fc36889 /lib/stdlib
parent937e33952a41fed5357d19338a81f4f026930f52 (diff)
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Do not save parameter list for any temporary processes
Previous commit changed the supervisor to not save parameter lists for temporary processes supervised by simple-one-for-one supervisors. But it is unnecessary to save them for any temporary processes as they should not be restarted. Proably the biggest gain is in the simple-one-for-one case. Also changed the test case count_children_memory so it does not test that which_children will produce garbage that must be reclaimed later. This is a strange thing to test and it is no longer true for all invocations of which_children.
Diffstat (limited to 'lib/stdlib')
-rw-r--r--lib/stdlib/src/supervisor.erl25
-rw-r--r--lib/stdlib/test/supervisor_SUITE.erl20
2 files changed, 20 insertions, 25 deletions
diff --git a/lib/stdlib/src/supervisor.erl b/lib/stdlib/src/supervisor.erl
index bfa7c96eca..469063689d 100644
--- a/lib/stdlib/src/supervisor.erl
+++ b/lib/stdlib/src/supervisor.erl
@@ -562,15 +562,11 @@ handle_start_child(Child, State) ->
false ->
case do_start_child(State#state.name, Child) of
{ok, Pid} ->
- Children = State#state.children,
{{ok, Pid},
- State#state{children =
- [Child#child{pid = Pid}|Children]}};
+ save_child(Child#child{pid = Pid}, State)};
{ok, Pid, Extra} ->
- Children = State#state.children,
{{ok, Pid, Extra},
- State#state{children =
- [Child#child{pid = Pid}|Children]}};
+ save_child(Child#child{pid = Pid}, State)};
{error, What} ->
{{error, {What, Child}}, State}
end;
@@ -593,13 +589,13 @@ restart_child(Pid, Reason, #state{children = [Child]} = State) when ?is_simple(S
NChild = Child#child{pid = Pid, mfargs = {M, F, Args}},
do_restart(RestartType, Reason, NChild, State);
error ->
- {ok, State}
+ {ok, State}
end;
+
restart_child(Pid, Reason, State) ->
Children = State#state.children,
case lists:keyfind(Pid, #child.pid, Children) of
- #child{} = Child ->
- RestartType = Child#child.restart_type,
+ #child{restart_type = RestartType} = Child ->
do_restart(RestartType, Reason, Child, State);
false ->
{ok, State}
@@ -783,6 +779,17 @@ monitor_child(Pid) ->
%% Child/State manipulating functions.
%%-----------------------------------------------------------------
+%% Note we do not want to save the parameter list for temporary processes as
+%% they will not be restarted, and hence we do not need this information.
+%% Especially for dynamic children to simple_one_for_one supervisors
+%% it could become very costly as it is not uncommon to spawn
+%% very many such processes.
+save_child(#child{restart_type = temporary,
+ mfargs = {M, F, _}} = Child, #state{children = Children} = State) ->
+ State#state{children = [Child#child{mfargs = {M, F, undefined}} |Children]};
+save_child(Child, #state{children = Children} = State) ->
+ State#state{children = [Child |Children]}.
+
save_dynamic_child(temporary, Pid, _, #state{dynamics = Dynamics} = State) ->
State#state{dynamics = [Pid | dynamics_db(temporary, Dynamics)]};
save_dynamic_child(RestartType, Pid, Args, #state{dynamics = Dynamics} = State) ->
diff --git a/lib/stdlib/test/supervisor_SUITE.erl b/lib/stdlib/test/supervisor_SUITE.erl
index 039ea298c4..4708658a6d 100644
--- a/lib/stdlib/test/supervisor_SUITE.erl
+++ b/lib/stdlib/test/supervisor_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1996-2010. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -1279,7 +1279,7 @@ count_children_allocator_test(MemoryState) ->
lists:all(fun(State) -> State == {e, true} end, AllocStates).
count_children_memory(doc) ->
- ["Test that which_children eats memory, but count_children does not."];
+ ["Test that count_children does not eat memory."];
count_children_memory(suite) ->
MemoryState = erlang:system_info(allocator),
case count_children_allocator_test(MemoryState) of
@@ -1323,8 +1323,8 @@ count_children_memory(Config) when is_list(Config) ->
?line ChildCount3 = ChildCount2,
%% count_children consumes memory using an accumulator function,
- %% but the space can be reclaimed incrementally, whereas
- %% which_children generates a return list.
+ %% but the space can be reclaimed incrementally,
+ %% which_children may generate garbage that will reclaimed later.
case (Size5 =< Size4) of
true -> ok;
false ->
@@ -1336,19 +1336,7 @@ count_children_memory(Config) when is_list(Config) ->
?line test_server:fail({count_children, used_more_memory})
end,
- case Size4 > Size3 of
- true -> ok;
- false ->
- ?line test_server:fail({which_children, used_no_memory})
- end,
- case Size6 > Size5 of
- true -> ok;
- false ->
- ?line test_server:fail({which_children, used_no_memory})
- end,
-
[exit(Pid, kill) || {undefined, Pid, worker, _Modules} <- Children3],
test_server:sleep(100),
?line [1,0,0,0] = get_child_counts(sup_test),
-
ok.