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