118 lines
4.3 KiB
Java
118 lines
4.3 KiB
Java
/*
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* Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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package gc.epsilon;
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/**
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* @test TestMemoryMXBeans
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* @requires vm.gc.Epsilon
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* @summary Test JMX memory beans
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* @modules java.base/jdk.internal.misc
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* java.management
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*
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* @run main/othervm -Xmx256m
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* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
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* gc.epsilon.TestMemoryMXBeans
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* -1 256
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*
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* @run main/othervm -Xms256m -Xmx256m
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* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
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* gc.epsilon.TestMemoryMXBeans
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* 256 256
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*
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* @run main/othervm -Xms64m -Xmx256m
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* -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC
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* gc.epsilon.TestMemoryMXBeans
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* 64 256
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*/
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import java.lang.management.*;
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public class TestMemoryMXBeans {
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static volatile Object sink;
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public static void main(String[] args) throws Exception {
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if (args.length < 2) {
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throw new IllegalStateException("Should provide expected heap sizes");
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}
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long initSize = 1L * Integer.parseInt(args[0]) * 1024 * 1024;
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long maxSize = 1L * Integer.parseInt(args[1]) * 1024 * 1024;
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testMemoryBean(initSize, maxSize);
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testAllocs();
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}
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public static void testMemoryBean(long initSize, long maxSize) {
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MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
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long heapInit = memoryMXBean.getHeapMemoryUsage().getInit();
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long heapMax = memoryMXBean.getHeapMemoryUsage().getMax();
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memoryMXBean.getNonHeapMemoryUsage().getInit(); // value not used
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memoryMXBean.getNonHeapMemoryUsage().getMax(); // value not used
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if (initSize > 0 && heapInit != initSize) {
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throw new IllegalStateException("Init heap size is wrong: " + heapInit + " vs " + initSize);
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}
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if (maxSize > 0 && heapMax != maxSize) {
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throw new IllegalStateException("Max heap size is wrong: " + heapMax + " vs " + maxSize);
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}
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}
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public static void testAllocs() throws Exception {
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MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
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// Try multiple times, to capture either APIs we call allocate lazily, or the background threads allocating
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int maxTries = 10;
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int tries = 0;
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while (true) {
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// Compute how much we waste during the calls themselves:
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long heapUsed1 = memoryMXBean.getHeapMemoryUsage().getUsed();
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long heapUsed2 = memoryMXBean.getHeapMemoryUsage().getUsed();
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long adj = heapUsed2 - heapUsed1;
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heapUsed1 = memoryMXBean.getHeapMemoryUsage().getUsed();
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sink = new int[1024*1024];
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heapUsed2 = memoryMXBean.getHeapMemoryUsage().getUsed();
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long diff = heapUsed2 - heapUsed1 - adj;
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long min = 8 + 4*1024*1024;
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long max = 16 + 4*1024*1024;
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if ((min <= diff && diff <= max)) {
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// Success
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return;
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}
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if (tries++ > maxTries) {
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throw new IllegalStateException("Allocation did not change used space right: " + diff + " should be in [" + min + ", " + max + "]");
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}
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// Wait and try again
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Thread.sleep(1000);
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}
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}
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}
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