1 /* 2 * Copyright (c) 2017, 2018, Red Hat, Inc. 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 package gc.epsilon; 26 27 /** 28 * @test TestMemoryMXBeans 29 * @requires vm.gc.Epsilon 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 }