1 /*
2 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 package gc.epsilon;
25
26 /**
27 * @test TestMemoryMXBeans
28 * @key gc
29 * @requires vm.gc.Epsilon & !vm.graal.enabled
30 * @summary Test JMX memory beans
31 * @modules java.base/jdk.internal.misc
32 * java.management
33 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -Xmx1g gc.epsilon.TestMemoryMXBeans -1 1024
34 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -Xms1g -Xmx1g gc.epsilon.TestMemoryMXBeans 1024 1024
35 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -Xms128m -Xmx1g gc.epsilon.TestMemoryMXBeans 128 1024
36 */
37
38 import java.lang.management.*;
39
40 public class TestMemoryMXBeans {
41
42 static volatile Object sink;
43
44 public static void main(String[] args) throws Exception {
45 if (args.length < 2) {
46 throw new IllegalStateException("Should provide expected heap sizes");
47 }
48
49 long initSize = 1L * Integer.parseInt(args[0]) * 1024 * 1024;
50 long maxSize = 1L * Integer.parseInt(args[1]) * 1024 * 1024;
51
52 testMemoryBean(initSize, maxSize);
53 testAllocs();
54 }
55
56 public static void testMemoryBean(long initSize, long maxSize) {
57 MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
58 long heapInit = memoryMXBean.getHeapMemoryUsage().getInit();
59 long heapMax = memoryMXBean.getHeapMemoryUsage().getMax();
60 memoryMXBean.getNonHeapMemoryUsage().getInit(); // value not used
61 memoryMXBean.getNonHeapMemoryUsage().getMax(); // value not used
62
63 if (initSize > 0 && heapInit != initSize) {
64 throw new IllegalStateException("Init heap size is wrong: " + heapInit + " vs " + initSize);
65 }
66 if (maxSize > 0 && heapMax != maxSize) {
67 throw new IllegalStateException("Max heap size is wrong: " + heapMax + " vs " + maxSize);
68 }
69 }
70
71 public static void testAllocs() throws Exception {
72 MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
73
74 // Try multiple times, to capture either APIs we call allocate lazily, or the background threads allocating
75 int maxTries = 10;
76 int tries = 0;
77
78 while (true) {
79 // Compute how much we waste during the calls themselves:
80 long heapUsed1 = memoryMXBean.getHeapMemoryUsage().getUsed();
81 long heapUsed2 = memoryMXBean.getHeapMemoryUsage().getUsed();
82 long adj = heapUsed2 - heapUsed1;
83
84 heapUsed1 = memoryMXBean.getHeapMemoryUsage().getUsed();
85 sink = new int[1024*1024];
86 heapUsed2 = memoryMXBean.getHeapMemoryUsage().getUsed();
87
88 long diff = heapUsed2 - heapUsed1 - adj;
89 long min = 8 + 4*1024*1024;
90 long max = 16 + 4*1024*1024;
91 if ((min <= diff && diff <= max)) {
92 // Success
93 return;
94 }
95
96 if (tries++ > maxTries) {
97 throw new IllegalStateException("Allocation did not change used space right: " + diff + " should be in [" + min + ", " + max + "]");
98 }
99
100 // Wait and try again
101 Thread.sleep(1000);
102 }
103 }
104
105 }