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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2018. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(counters_SUITE).
-include_lib("common_test/include/ct.hrl").
-export([suite/0, all/0]).
-export([basic/1, bad/1, limits/1, indep/1, write_concurrency/1]).
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[basic, bad, limits, indep, write_concurrency].
basic(Config) when is_list(Config) ->
Size = 10,
[begin
Ref = counters:new(Size,[Type]),
#{size:=Size, memory:=Memory} = counters:info(Ref),
check_memory(Type, Memory, Size),
[basic_do(Ref, Ix) || Ix <- lists:seq(1, Size)]
end
|| Type <- [atomics, write_concurrency]],
ok.
basic_do(Ref, Ix) ->
0 = counters:get(Ref, Ix),
ok = counters:add(Ref, Ix, 3),
3 = counters:get(Ref, Ix),
ok = counters:add(Ref, Ix, 14),
17 = counters:get(Ref, Ix),
ok = counters:add(Ref, Ix, -20),
-3 = counters:get(Ref, Ix),
ok = counters:add(Ref, Ix, 100),
97 = counters:get(Ref, Ix),
ok = counters:sub(Ref, Ix, 20),
77 = counters:get(Ref, Ix),
ok = counters:sub(Ref, Ix, -10),
87 = counters:get(Ref, Ix),
ok = counters:put(Ref, Ix, 0),
0 = counters:get(Ref, Ix),
ok = counters:put(Ref, Ix, 123),
123 = counters:get(Ref, Ix),
ok = counters:put(Ref, Ix, -321),
-321 = counters:get(Ref, Ix),
ok.
check_memory(atomics, Memory, Size) ->
{_,true} = {Memory, Memory > Size*8},
{_,true} = {Memory, Memory < Size*max_atomic_sz() + 100};
check_memory(write_concurrency, Memory, Size) ->
NWords = erlang:system_info(schedulers) + 1,
{_,true} = {Memory, Memory > NWords*Size*8},
{_,true} = {Memory, Memory < NWords*(Size+7)*max_atomic_sz() + 100}.
max_atomic_sz() ->
case erlang:system_info({wordsize, external}) of
4 -> 16;
8 ->
EI = erlang:system_info(ethread_info),
case lists:keyfind("64-bit native atomics", 1, EI) of
{_, "no", _} -> 16;
_ -> 8
end
end.
bad(Config) when is_list(Config) ->
{'EXIT',{badarg,_}} = (catch counters:new(0,[])),
{'EXIT',{badarg,_}} = (catch counters:new(10,[bad])),
{'EXIT',{badarg,_}} = (catch counters:new(10,[atomic, bad])),
{'EXIT',{badarg,_}} = (catch counters:new(10,[write_concurrency | bad])),
Ref = counters:new(10,[]),
{'EXIT',{badarg,_}} = (catch counters:get(1742, 7)),
{'EXIT',{badarg,_}} = (catch counters:get(make_ref(), 7)),
{'EXIT',{badarg,_}} = (catch counters:get(Ref, -1)),
{'EXIT',{badarg,_}} = (catch counters:get(Ref, 0)),
{'EXIT',{badarg,_}} = (catch counters:get(Ref, 11)),
{'EXIT',{badarg,_}} = (catch counters:get(Ref, 7.0)),
ok.
limits(Config) when is_list(Config) ->
limits_do(counters:new(1,[atomics])),
limits_do(counters:new(1,[write_concurrency])),
ok.
limits_do(Ref) ->
Bits = 64,
Max = (1 bsl (Bits-1)) - 1,
Min = -(1 bsl (Bits-1)),
0 = counters:get(Ref, 1),
ok = counters:put(Ref, 1, Max),
Max = counters:get(Ref, 1),
ok = counters:add(Ref, 1, 1),
Min = counters:get(Ref, 1),
ok = counters:sub(Ref, 1, 1),
Max = counters:get(Ref, 1),
ok = counters:put(Ref, 1, Min),
Min = counters:get(Ref, 1),
IncrMax = (Max bsl 1) bor 1,
ok = counters:put(Ref, 1, 0),
ok = counters:add(Ref, 1, IncrMax),
-1 = counters:get(Ref, 1),
{'EXIT',{badarg,_}} = (catch counters:add(Ref, 1, IncrMax+1)),
{'EXIT',{badarg,_}} = (catch counters:add(Ref, 1, Min-1)),
{'EXIT',{badarg,_}} = (catch counters:put(Ref, 1, Max+1)),
{'EXIT',{badarg,_}} = (catch counters:add(Ref, 1, Min-1)),
ok.
%% Verify that independent workers, using different counters
%% within the same array, do not interfere with each other.
indep(Config) when is_list(Config) ->
NScheds = erlang:system_info(schedulers),
Ref = counters:new(NScheds,[write_concurrency]),
Rounds = 100,
Papa = self(),
Pids = [spawn_opt(fun () ->
Val = I*197,
counters:put(Ref, I, Val),
indep_looper(Rounds, Ref, I, Val),
Papa ! {self(), done}
end,
[link, {scheduler, I}])
|| I <- lists:seq(1, NScheds)],
[receive {P,done} -> ok end || P <- Pids],
ok.
indep_looper(0, _, _ , _) ->
ok;
indep_looper(N, Ref, I, Val0) ->
%%io:format("Val0 = ~p\n", [Val0]),
Val0 = counters:get(Ref, I),
Val1 = indep_adder(Ref, I, Val0),
indep_subber(Ref, I, Val1),
Val2 = N*7 + I,
counters:put(Ref, I, Val2),
indep_looper(N-1, Ref, I, Val2).
indep_adder(Ref, I, Val) when Val < (1 bsl 62) ->
%%io:format("adder Val = ~p\n", [Val]),
Incr = abs(Val div 2) + I + 984735,
counters:add(Ref, I, Incr),
Res = Val + Incr,
Res = counters:get(Ref, I),
indep_adder(Ref, I, Res);
indep_adder(_Ref, _I, Val) ->
Val.
indep_subber(Ref, I, Val) when Val > -(1 bsl 62) ->
%%io:format("subber Val = ~p\n", [Val]),
Decr = (abs(Val div 2) + I + 725634),
counters:sub(Ref, I, Decr),
Res = Val - Decr,
Res = counters:get(Ref, I),
indep_subber(Ref, I, Res);
indep_subber(_Ref, _I, Val) ->
Val.
%% Verify write_concurrency yields correct results.
write_concurrency(Config) when is_list(Config) ->
rand:seed(exs1024s),
io:format("*** SEED: ~p ***\n", [rand:export_seed()]),
NScheds = erlang:system_info(schedulers),
Size = 100,
Ref = counters:new(Size,[write_concurrency]),
Rounds = 1000,
Papa = self(),
Pids = [spawn_opt(fun Worker() ->
receive
{go, Ix, Incr} ->
wc_looper(Rounds, Ref, Ix, Incr),
Papa ! {self(), done, Rounds*Incr},
Worker();
stop ->
ok
end
end,
[link, {scheduler, N}])
|| N <- lists:seq(1, NScheds)],
[begin
Base = rand_log64(),
counters:put(Ref, Index, Base),
SendList = [{P,{go, Index, rand_log64()}} || P <- Pids],
[P ! Msg || {P,Msg} <- SendList],
Added = lists:sum([receive {P,done,Contrib} -> Contrib end || P <- Pids]),
Result = mask_sint64(Base+Added),
{_,Result} = {Result, counters:get(Ref, Index)}
end
|| Index <- lists:seq(1, Size)],
[begin unlink(P), P ! stop end || P <- Pids],
ok.
wc_looper(0, _, _, _) ->
ok;
wc_looper(N, Ref, Ix, Incr) ->
counters:add(Ref, Ix, Incr),
wc_looper(N-1, Ref, Ix, Incr).
mask_sint64(X) ->
SMask = 1 bsl 63,
UMask = SMask - 1,
(X band UMask) - (X band SMask).
%% A random signed 64-bit integer
%% with a uniformly distributed number of significant bits.
rand_log64() ->
Uint = round(math:pow(2, rand:uniform()*63)),
case rand:uniform(2) of
1 -> -Uint;
2 -> Uint
end.
|
