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