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
|
/*
* Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 4607272 6999915 7185340
* @summary Unit test for AsynchronousSocketChannel
* @modules java.management
* @run main/othervm -XX:+DisableExplicitGC -XX:MaxDirectMemorySize=75m Leaky
*/
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.net.*;
import java.util.List;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import java.lang.management.BufferPoolMXBean;
import java.lang.management.ManagementFactory;
/**
* Heap buffers must be substituted with direct buffers when doing I/O. This
* test creates a scenario on Windows that challenges the per-thread buffer
* cache and quickly leads to an OutOfMemoryError if temporary buffers are
* not returned to the native heap.
*/
public class Leaky {
static final int K = 1024;
static class Connection {
private final AsynchronousSocketChannel client;
private final SocketChannel peer;
private final ByteBuffer dst;
private Future<Integer> readResult;
Connection(AsynchronousChannelGroup group) throws Exception {
ServerSocketChannel ssc =
ServerSocketChannel.open().bind(new InetSocketAddress(0));
InetAddress lh = InetAddress.getLocalHost();
int port = ((InetSocketAddress)(ssc.getLocalAddress())).getPort();
SocketAddress remote = new InetSocketAddress(lh, port);
client = AsynchronousSocketChannel.open(group);
client.connect(remote).get();
peer = ssc.accept();
ssc.close();
dst = ByteBuffer.allocate(K*K);
}
void startRead() {
dst.clear();
readResult = client.read(dst);
}
void write() throws Exception {
peer.write(ByteBuffer.wrap("X".getBytes()));
}
void finishRead() throws Exception {
readResult.get();
}
}
public static void main(String[] args) throws Exception {
ThreadFactory threadFactory = new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r);
t.setDaemon(true);
return t;
}
};
AsynchronousChannelGroup group =
AsynchronousChannelGroup.withFixedThreadPool(4, threadFactory);
final int CONNECTION_COUNT = 10;
Connection[] connections = new Connection[CONNECTION_COUNT];
for (int i=0; i<CONNECTION_COUNT; i++) {
connections[i] = new Connection(group);
}
for (int i=0; i<1024; i++) {
// initiate reads
for (Connection conn: connections) {
conn.startRead();
}
// write data so that the read can complete
for (Connection conn: connections) {
conn.write();
}
// complete read
for (Connection conn: connections) {
conn.finishRead();
}
}
// print summary of buffer pool usage
List<BufferPoolMXBean> pools =
ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
for (BufferPoolMXBean pool: pools)
System.out.format(" %8s ", pool.getName());
System.out.println();
for (int i=0; i<pools.size(); i++)
System.out.format("%6s %10s %10s ", "Count", "Capacity", "Memory");
System.out.println();
for (BufferPoolMXBean pool: pools) {
System.out.format("%6d %10d %10d ",
pool.getCount(), pool.getTotalCapacity(), pool.getMemoryUsed());
}
System.out.println();
}
}
|
