106 lines
3.5 KiB
Java
106 lines
3.5 KiB
Java
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. 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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package utils;
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import java.lang.management.ManagementFactory;
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import java.lang.management.MemoryPoolMXBean;
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/**
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* Utility to obtain memory pools statistics
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*
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*/
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public class Pools {
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private static final String EDEN_SPACE_POOL = "Eden Space";
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private static final String OLD_GEN_POOL = "Old Gen";
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private static final String METASPACE_POOL = "Metaspace";
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private static final String SURVIVOR_SPACE = "Survivor Space";
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public static long getNGMaxSize() {
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// NewGen is consists of Eden and two Survivor spaces
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return getPoolMaxSize(EDEN_SPACE_POOL) + 2 * getPoolMaxSize(SURVIVOR_SPACE);
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}
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public static long getHeapCommittedSize() {
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return ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getCommitted() / 1024;
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}
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public static long getEdenCommittedSize() {
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return getPoolCommittedSize(EDEN_SPACE_POOL);
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}
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public static long getOldGenCommittedSize() {
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return getPoolCommittedSize(OLD_GEN_POOL);
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}
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public static long getMetaspaceCommittedSize() {
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return getPoolCommittedSize(METASPACE_POOL);
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}
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private static long getPoolMaxSize(String poolName) {
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long result;
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MemoryPoolMXBean pool = findPool(poolName);
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if (pool != null) {
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if (pool.getUsage().getMax() == -1) {
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result = -1;
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} else {
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result = pool.getUsage().getCommitted() / 1024;
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}
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} else {
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throw new RuntimeException("Pool '" + poolName + "' wasn't found");
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}
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log("Max size of the pool '" + poolName + "' is " + result);
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return result;
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}
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private static long getPoolCommittedSize(String poolName) {
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long result;
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MemoryPoolMXBean pool = findPool(poolName);
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if (pool != null) {
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if (pool.getUsage().getCommitted() == -1) {
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result = -1;
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} else {
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result = pool.getUsage().getCommitted() / 1024;
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}
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} else {
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throw new RuntimeException("Pool '" + poolName + "' wasn't found");
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}
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log("Committed size of the pool '" + poolName + "' is " + result);
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return result;
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}
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private static MemoryPoolMXBean findPool(String poolName) {
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for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
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if (pool.getName().contains(poolName)) {
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return pool;
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}
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}
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return null;
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}
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private static void log(String s) {
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System.out.println(s);
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}
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}
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