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
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2017. 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(efile_SUITE).
-export([all/0, suite/0]).
-export([async_dist/1,
iter_max_files/1,
proc_zero_sized_files/1
]).
-export([do_iter_max_files/2, do_async_dist/1]).
-include_lib("common_test/include/ct.hrl").
-include_lib("stdlib/include/assert.hrl").
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[iter_max_files, async_dist, proc_zero_sized_files].
do_async_dist(Dir) ->
X = 100,
AT = erlang:system_info(thread_pool_size),
Keys = file_keys(Dir,AT*X,[],[]),
Tab = ets:new(x,[ordered_set]),
[ ets:insert(Tab,{N,0}) || N <- lists:seq(0,AT-1) ],
[ ets:update_counter(Tab,(N rem AT),1) || N <- Keys ],
Res = [ V || {_,V} <- ets:tab2list(Tab) ],
ets:delete(Tab),
{Res, sdev(Res)/X}.
sdev(List) ->
Len = length(List),
Mean = lists:sum(List)/Len,
math:sqrt(lists:sum([ (X - Mean) * (X - Mean) || X <- List ]) / Len).
file_keys(_,0,FdList,FnList) ->
[ file:close(FD) || FD <- FdList ],
[ file:delete(FN) || FN <- FnList ],
[];
file_keys(Dir,Num,FdList,FnList) ->
Name = "dummy"++integer_to_list(Num),
FN = filename:join([Dir,Name]),
case file:open(FN,[write,raw]) of
{ok,FD} ->
{file_descriptor,prim_file,{Port,_}} = FD,
<<X:32/integer-big>> =
iolist_to_binary(erlang:port_control(Port,$K,[])),
[X | file_keys(Dir,Num-1,[FD|FdList],[FN|FnList])];
{error,_} ->
% Try freeing up FD's if there are any
case FdList of
[] ->
exit({cannot_open_file,FN});
_ ->
[ file:close(FD) || FD <- FdList ],
[ file:delete(F) || F <- FnList ],
file_keys(Dir,Num,[],[])
end
end.
%% Check that the distribution of files over async threads is fair
async_dist(Config) when is_list(Config) ->
DataDir = proplists:get_value(data_dir,Config),
Dir = filename:dirname(code:which(?MODULE)),
AsyncSizes = [7,10,100,255,256,64,63,65],
Max = 0.5,
lists:foreach(fun(Size) ->
{ok,Node} =
test_server:start_node
(test_iter_max_files,slave,
[{args,
"+A "++integer_to_list(Size)++
" -pa " ++ Dir}]),
{Distr,SD} = rpc:call(Node,?MODULE,do_async_dist,
[DataDir]),
test_server:stop_node(Node),
if
SD > Max ->
io:format("Bad async queue distribution for "
"~p async threads:~n"
" Standard deviation is ~p~n"
" Key distribution:~n ~lp~n",
[Size,SD,Distr]),
exit({bad_async_dist,Size,SD,Distr});
true ->
io:format("OK async queue distribution for "
"~p async threads:~n"
" Standard deviation is ~p~n"
" Key distribution:~n ~lp~n",
[Size,SD,Distr]),
ok
end
end, AsyncSizes),
ok.
%%
%% Open as many files as possible. Do this several times and check
%% that we get the same number of files every time.
%%
iter_max_files(Config) when is_list(Config) ->
DataDir = proplists:get_value(data_dir,Config),
TestFile = filename:join(DataDir, "existing_file"),
N = 10,
%% Run on a different node in order to set the max ports
Dir = filename:dirname(code:which(?MODULE)),
{ok,Node} = test_server:start_node(test_iter_max_files,slave,
[{args,"+Q 1524 -pa " ++ Dir}]),
L = rpc:call(Node,?MODULE,do_iter_max_files,[N, TestFile]),
test_server:stop_node(Node),
io:format("Number of files opened in each test:~n~w\n", [L]),
all_equal(L),
Head = hd(L),
if Head >= 2 -> ok;
true -> ct:fail(too_few_files)
end,
{comment, "Max files: " ++ integer_to_list(hd(L))}.
do_iter_max_files(N, Name) when N > 0 ->
[max_files(Name)| do_iter_max_files(N-1, Name)];
do_iter_max_files(_, _) ->
[].
all_equal([E, E| T]) ->
all_equal([E| T]);
all_equal([_]) ->
ok;
all_equal([]) ->
ok.
max_files(Name) ->
Fds = open_files(Name),
N = length(Fds),
close_files(Fds),
N.
close_files([Fd| Fds]) ->
file:close(Fd),
close_files(Fds);
close_files([]) ->
ok.
open_files(Name) ->
case file:open(Name, [read,raw]) of
{ok, Fd} ->
[Fd| open_files(Name)];
{error, _Reason} ->
% io:format("Error reason: ~p", [_Reason]),
[]
end.
%% @doc If /proc filesystem exists (no way to know if it is real proc or just
%% a /proc directory), let's read some zero sized files 500 times each, while
%% ensuring that response isn't empty << >>
proc_zero_sized_files(Config) when is_list(Config) ->
{Type, Flavor} = os:type(),
%% Some files which exist on Linux but might be missing on other systems
Inputs = ["/proc/cpuinfo",
"/proc/meminfo",
"/proc/partitions",
"/proc/swaps",
"/proc/version",
"/proc/uptime",
%% curproc is present on freebsd
"/proc/curproc/cmdline"],
case filelib:is_dir("/proc") of
false -> {skip, "/proc not found"}; % skip the test if no /proc
_ when Type =:= unix andalso Flavor =:= sunos ->
%% SunOS has a /proc, but no zero sized special files
{skip, "sunos does not have any zero sized special files"};
true ->
%% Take away files which do not exist in proc
Inputs1 = lists:filter(fun filelib:is_file/1, Inputs),
%% Fail if none of mentioned files exist in /proc, did we just get
%% a normal /proc directory without any special files?
?assertNotEqual([], Inputs1),
%% For 6 inputs and 500 attempts each this do run anywhere
%% between 500 and 3000 function calls.
lists:foreach(
fun(Filename) -> do_proc_zero_sized(Filename, 500) end,
Inputs1)
end.
%% @doc Test one file N times to also trigger possible leaking fds and memory
do_proc_zero_sized(_Filename, 0) -> ok;
do_proc_zero_sized(Filename, N) ->
Data = file:read_file(Filename),
?assertNotEqual(<<>>, Data),
do_proc_zero_sized(Filename, N-1).
|
