aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/test/gc_SUITE.erl
blob: 066aa215b2f3ba8bee4f1ff3a34adaeaf655a036 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1997-2009. 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
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% %CopyrightEnd%
%%

%% Test the garbage collector (or Memory Recycler)

-module(gc_SUITE).

-include("test_server.hrl").
-export([all/1]).

-define(default_timeout, ?t:minutes(10)).

-export([grow_heap/1, grow_stack/1, grow_stack_heap/1]).

all(suite) ->
    [grow_heap,grow_stack, grow_stack_heap].

grow_heap(doc) -> ["Produce a growing list of elements, ",
		   "for X calls, then drop one item per call",
		   "until the list is empty."];
grow_heap(Config) when is_list(Config) ->
    ?line Dog=test_server:timetrap(test_server:minutes(40)),
    ?line ok=grow_heap1(256),
    case os:type() of 
	vxworks ->
	    stop_here;
	_ ->
	    ?line ok=grow_heap1(512),
	    ?line ok=grow_heap1(1024),
	    ?line ok=grow_heap1(2048)
    end,
    ?line test_server:timetrap_cancel(Dog),
    ok.

grow_heap1(Len) ->
    io:format("~ngrow_heap with ~p items.",[Len]),
    show_heap("before:"),
    grow_heap1([], Len, 0, up),
    show_heap("after:").

grow_heap1(List, MaxLen, MaxLen, up) ->
    show_heap("top:"),
    grow_heap1(List, MaxLen, MaxLen-1, down);
grow_heap1(List, MaxLen, CurLen, up) ->
    NewList=[make_arbit()|List],
    grow_heap1(NewList, MaxLen, CurLen+1, up);
grow_heap1([], _MaxLen, _, down) ->
    ok;
grow_heap1([_|List], MaxLen, CurLen, down) ->
    ?line {_,_,C}=erlang:now(),
    ?line Num=C rem (length(List))+1,
    ?line Elem=lists:nth(Num, List),
    ?line NewList=lists:delete(Elem, List),
    grow_heap1(NewList, MaxLen, CurLen-1, down).



grow_stack(doc) -> ["Increase and decrease stack size, and ",
		    "drop off some garbage from time to time."];
grow_stack(Config) when is_list(Config) ->
    ?line Dog=test_server:timetrap(test_server:minutes(80)),
    show_heap("before:"),
    case os:type() of
	vxworks ->
	    ?line grow_stack1(25, 0);
	_ ->
	    ?line grow_stack1(200, 0)
    end,
    show_heap("after:"),
    ?line test_server:timetrap_cancel(Dog),
    ok.

grow_stack1(0, _) ->
    ok;
grow_stack1(Recs, 0) ->
%    show_heap("running:"),
    grow_stack1(Recs-1, Recs),
    grow_stack1(0,0);
grow_stack1(Recs, CurRecs) ->
    grow_stack1(Recs, CurRecs-1),
    make_arbit(),
    grow_stack1(1,0),
    ok.


%% Let's see how BEAM handles this one...
grow_stack_heap(doc) -> ["While growing the heap, bounces the size ",
			 "of the stack, and while reducing the heap",
			 "bounces the stack usage."];
grow_stack_heap(Config) when is_list(Config) ->
    case os:type() of 
	vxworks ->
	    {comment, "Takes too long to run on VxWorks/cpu32"};
	_ ->
	    ?line Dog=test_server:timetrap(test_server:minutes(40)),
	    ?line grow_stack_heap1(16),
	    ?line grow_stack_heap1(32),
	    ?line test_server:timetrap_cancel(Dog),
	    ok
    end.

grow_stack_heap1(MaxLen) ->
    io:format("~ngrow_stack_heap with ~p items.",[MaxLen]),
    show_heap("before:"),
    grow_stack_heap1([], MaxLen, 0, up),
    show_heap("after:").

grow_stack_heap1(List, MaxLen, MaxLen, up) ->
    show_heap("top:"),
    grow_stack_heap1(List, MaxLen, MaxLen-1, down);
grow_stack_heap1(List, MaxLen, CurLen, up) ->
    grow_stack1(CurLen*2,0),
    grow_stack_heap1([make_arbit()|List], MaxLen, CurLen+1, up),
    ok;

grow_stack_heap1([], _MaxLen, _, down) -> ok;
grow_stack_heap1([_|List], MaxLen, CurLen, down) ->
    grow_stack1(CurLen*2,0),
    ?line {_,_,C}=erlang:now(),
    ?line Num=C rem (length(List))+1,
    ?line Elem=lists:nth(Num, List),
    ?line NewList=lists:delete(Elem, List),
    grow_stack_heap1(NewList, MaxLen, CurLen-1, down),
    ok.


%% Create an arbitrary element/term.
make_arbit() ->
    {AA,BB,CC}=erlang:now(),
    A=AA+1, B=BB+1, C=CC+1,
    New =
	case C rem 9 of
	    0 -> make_string((B div C) +5);
	    1 -> C;
	    2 -> make_ref();
	    3 -> self();
	    4 -> list_to_binary(make_string((C div B) + 12));
	    5 -> (C*B)/(A+1);
	    6 -> list_to_tuple(make_string((B div C) +5));
	    7 -> list_to_atom(make_string(((C div B) rem 254) + 2));
	    8 -> fun(X) -> {X,AA,make_string((B div C)+10)} end
	end,
    New.

%% Create an arbitrary string of a certain length.
make_string(Length) ->
    Alph="abcdefghjiklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"++
	"0123456789",
    make_string(Alph, Length, []).

make_string(_, 0, Acc) ->
    Acc;
make_string(Alph, Length, Acc) ->
    {_,_,C}=erlang:now(),
    Pos=1+(Length*C rem length(Alph)),
    make_string(Alph, Length-1, 
		[lists:nth(Pos,Alph)|Acc]).

show_heap(String) ->
    garbage_collect(self()),
    receive after 1 -> ok end,
    {heap_size, HSize}=process_info(self(), heap_size),
    {stack_size, SSize}=process_info(self(), stack_size),
    io:format("Heap/Stack "++String++"~p/~p", [HSize, SSize]).