BigReadWrite.java revision 2485:8a4557c5dfa1 
1/*
2 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/* @test
25 * @bug 4863423
26 * @summary Test Util caching policy
27 */
28
29import java.io.*;
30import java.nio.*;
31import java.nio.channels.*;
32
33public class BigReadWrite {
34
35    static int testSize = 15;
36
37    public static void main(String[] args) throws Exception {
38        // One platform suffices to check for this bug
39        String osName = System.getProperty("os.name");
40        if (!osName.startsWith("SunOS"))
41            return;
42
43        FileOutputStream fos = new FileOutputStream("/dev/zero");
44        FileChannel fc = fos.getChannel();
45
46        // Three small writes to fill up the Util cache
47        ByteBuffer buf = ByteBuffer.allocate(900);
48        fc.write(buf);
49        buf = ByteBuffer.allocate(950);
50        fc.write(buf);
51        buf = ByteBuffer.allocate(975);
52        fc.write(buf);
53        buf = ByteBuffer.allocate(4419000);
54
55        // Now initiate large write to create larger direct buffers
56        long iterations = 0;
57        while (iterations < 50) {
58            fc.write(buf);
59            buf.rewind();
60            iterations++;
61        }
62        // Clean up
63        fc.close();
64    }
65}
66