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") | (os.arch == "sparcv9")
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 RuntimeException();
62 boolean throwp = parseThrow(args[0]);
63 int size = parseSize(args[1]);
64 int incr = (args.length > 2 ? parseSize(args[2]) : size);
65
66 Properties p = System.getProperties();
67 if (p.getProperty("sun.nio.MaxDirectMemorySize") != null)
68 throw new RuntimeException("sun.nio.MaxDirectMemorySize defined");
69
70 ByteBuffer [] b = new ByteBuffer[K];
71
72 // Fill up most/all of the direct memory
73 int i = 0;
74 while (size >= incr) {
75 b[i++] = ByteBuffer.allocateDirect(incr);
76 size -= incr;
77 }
78
79 if (throwp) {
80 try {
81 b[i] = ByteBuffer.allocateDirect(incr);
82 throw new RuntimeException("OutOfMemoryError not thrown: "
83 + incr);
84 } catch (OutOfMemoryError e) {
85 e.printStackTrace(System.out);
86 System.out.println("OK - Error thrown as expected ");
87 }
88 } else {
89 b[i] = ByteBuffer.allocateDirect(incr);
90 System.out.println("OK - Error not thrown");
91 }
92 }
93
94 private static boolean parseThrow(String s) {
95 if (s.equals("true")) return true;
96 if (s.equals("false")) return false;
97 throw new RuntimeException("Unrecognized expectation: " + s);
98 }
99
100 private static int parseSize(String size) throws Exception {
101
102 if (size.equals("DEFAULT"))
103 return (int)Runtime.getRuntime().maxMemory();
104 if (size.equals("DEFAULT+1"))
105 return (int)Runtime.getRuntime().maxMemory() + 1;
106 if (size.equals("DEFAULT+1M"))
107 return (int)Runtime.getRuntime().maxMemory() + (1 << 20);
108 if (size.equals("DEFAULT-1"))
109 return (int)Runtime.getRuntime().maxMemory() - 1;
110 if (size.equals("DEFAULT/2"))
111 return (int)Runtime.getRuntime().maxMemory() / 2;
112
113 int idx = 0, len = size.length();
114
115
116 for (int i = 0; i < len; i++) {
117 if (Character.isDigit(size.charAt(i))) idx++;
118 else break;
119 }
120
121 if (idx == 0)
122 throw new RuntimeException("No digits detected: " + size);
123
124 int result = Integer.parseInt(size.substring(0, idx));
125
126 if (idx < len) {
127 for (int i = idx; i < len; i++) {
128 switch(size.charAt(i)) {
129 case 'T': case 't': result *= K; // fall through
130 case 'G': case 'g': result *= K; // fall through
131 case 'M': case 'm': result *= K; // fall through
132 case 'K': case 'k': result *= K;
133 break;
134 default:
135 throw new RuntimeException("Unrecognized size: " + size);
136 }
137 }
138 }
139 return result;
140 }
141 }