1 /*
2 * Copyright (c) 2002, 2017, 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 /*
25 * @test
26 * @bug 4627316 6743526
27 * @summary Test option to limit direct memory allocation
28 * @requires (os.arch == "x86_64") | (os.arch == "amd64")
29 * @library /test/lib
30 *
31 * @summary Test: memory is properly limited using multiple buffers
32 * @run main/othervm -XX:MaxDirectMemorySize=10 LimitDirectMemory true 10 1
33 * @run main/othervm -XX:MaxDirectMemorySize=1k LimitDirectMemory true 1k 100
34 * @run main/othervm -XX:MaxDirectMemorySize=10m LimitDirectMemory true 10m 10m
35 *
36 * @summary Test: We can increase the amount of available memory
37 * @run main/othervm -XX:MaxDirectMemorySize=65M LimitDirectMemory false 64M 65M
38 *
39 * @summary Test: Exactly the default amount of memory is available
40 * @run main/othervm LimitDirectMemory false 10 1
41 * @run main/othervm -Xmx64m LimitDirectMemory false 0 DEFAULT
42 * @run main/othervm -Xmx64m LimitDirectMemory true 0 DEFAULT+1
43 *
44 * @summary Test: We should be able to eliminate direct memory allocation entirely
45 * @run main/othervm -XX:MaxDirectMemorySize=0 LimitDirectMemory true 0 1
46 *
47 * @summary Test: Setting the system property should not work so we should be able
48 * to allocate the default amount
49 * @run main/othervm -Dsun.nio.MaxDirectMemorySize=1K -Xmx64m
50 * LimitDirectMemory false DEFAULT-1 DEFAULT/2
51 */
52
53 import java.nio.ByteBuffer;
54 import java.util.Properties;
55
56 public class LimitDirectMemory {
57 private static final int K = 1024;
58
59 public static void main(String [] args) throws Exception {
60 if (args.length < 2) {
61 throw new IllegalArgumentException("Usage: "
62 + "java LimitDirectMemory"
63 + " <OOME_expected(true|false)>"
64 + " <fill_direct_memory>"
65 + " <size_per_buffer>");
66 }
67 boolean throwp = parseThrow(args[0]);
68 int size = parseSize(args[1]);
69 int incr = (args.length > 2 ? parseSize(args[2]) : size);
70
71 Properties p = System.getProperties();
72 if (p.getProperty("sun.nio.MaxDirectMemorySize") != null)
73 throw new RuntimeException("sun.nio.MaxDirectMemorySize defined");
74
75 ByteBuffer [] b = new ByteBuffer[K];
76
77 // Fill up most/all of the direct memory
78 int i = 0;
79 while (size >= incr) {
80 b[i++] = ByteBuffer.allocateDirect(incr);
81 size -= incr;
82 }
83
84 if (throwp) {
85 try {
86 b[i] = ByteBuffer.allocateDirect(incr);
87 throw new RuntimeException("OutOfMemoryError not thrown: "
88 + incr);
89 } catch (OutOfMemoryError e) {
90 e.printStackTrace(System.out);
91 System.out.println("OK - Error thrown as expected ");
92 }
93 } else {
94 b[i] = ByteBuffer.allocateDirect(incr);
95 System.out.println("OK - Error not thrown");
96 }
97 }
98
99 private static boolean parseThrow(String s) {
100 if (s.equals("true")) return true;
101 if (s.equals("false")) return false;
102 throw new RuntimeException("Unrecognized expectation: " + s);
103 }
104
105 private static int parseSize(String size) throws Exception {
106
107 if (size.equals("DEFAULT"))
108 return (int)Runtime.getRuntime().maxMemory();
109 if (size.equals("DEFAULT+1"))
110 return (int)Runtime.getRuntime().maxMemory() + 1;
111 if (size.equals("DEFAULT+1M"))
112 return (int)Runtime.getRuntime().maxMemory() + (1 << 20);
113 if (size.equals("DEFAULT-1"))
114 return (int)Runtime.getRuntime().maxMemory() - 1;
115 if (size.equals("DEFAULT/2"))
116 return (int)Runtime.getRuntime().maxMemory() / 2;
117
118 int idx = 0, len = size.length();
119
120
121 for (int i = 0; i < len; i++) {
122 if (Character.isDigit(size.charAt(i))) idx++;
123 else break;
124 }
125
126 if (idx == 0)
127 throw new RuntimeException("No digits detected: " + size);
128
129 int result = Integer.parseInt(size.substring(0, idx));
130
131 if (idx < len) {
132 for (int i = idx; i < len; i++) {
133 switch(size.charAt(i)) {
134 case 'T': case 't': result *= K; // fall through
135 case 'G': case 'g': result *= K; // fall through
136 case 'M': case 'm': result *= K; // fall through
137 case 'K': case 'k': result *= K;
138 break;
139 default:
140 throw new RuntimeException("Unrecognized size: " + size);
141 }
142 }
143 }
144 return result;
145 }
146 }