| /* |
| * Copyright 2003-2004 Sun Microsystems, 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 4892507 |
| * @summary Basic Test for MemoryPool.resetPeakUsage() |
| * @author Mandy Chung |
| * |
| * @build ResetPeakMemoryUsage MemoryUtil |
| * @run main ResetPeakMemoryUsage |
| */ |
| |
| import java.lang.management.*; |
| import java.util.*; |
| |
| public class ResetPeakMemoryUsage { |
| private static MemoryMXBean mbean = ManagementFactory.getMemoryMXBean(); |
| private static List pools = ManagementFactory.getMemoryPoolMXBeans(); |
| private static MemoryPoolMXBean mpool = null; |
| |
| public static void main(String[] argv) { |
| ListIterator iter = pools.listIterator(); |
| while (iter.hasNext()) { |
| MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next(); |
| if (p.getType() == MemoryType.HEAP && |
| p.isUsageThresholdSupported()) { |
| mpool = p; |
| System.out.println("Selected memory pool: "); |
| MemoryUtil.printMemoryPool(mpool); |
| break; |
| } |
| } |
| if (mpool == null) { |
| throw new RuntimeException("No heap pool found with threshold != -1"); |
| } |
| |
| MemoryUsage usage0 = mpool.getUsage(); |
| MemoryUsage peak0 = mpool.getPeakUsage(); |
| final long largeArraySize = (usage0.getMax() - usage0.getUsed()) / 10; |
| |
| System.out.println("Before big object is allocated: "); |
| printMemoryUsage(); |
| |
| // Allocate a big array - need to allocate from the old gen |
| Object[][][] obj = new Object[1][1][(int) largeArraySize]; |
| |
| System.out.println("After the object is allocated: "); |
| printMemoryUsage(); |
| |
| MemoryUsage usage1 = mpool.getUsage(); |
| MemoryUsage peak1 = mpool.getPeakUsage(); |
| |
| if (usage1.getUsed() <= usage0.getUsed()) { |
| throw new RuntimeException( |
| formatSize("Before allocation: used", usage0.getUsed()) + |
| " expected to be > " + |
| formatSize("After allocation: used", usage1.getUsed())); |
| } |
| |
| if (peak1.getUsed() <= peak0.getUsed()) { |
| throw new RuntimeException( |
| formatSize("Before allocation: peak", peak0.getUsed()) + |
| " expected to be > " + |
| formatSize("After allocation: peak", peak1.getUsed())); |
| } |
| |
| |
| // The object is now garbage and do a GC |
| // memory usage should drop |
| obj = null; |
| mbean.gc(); |
| |
| System.out.println("After GC: "); |
| printMemoryUsage(); |
| |
| MemoryUsage usage2 = mpool.getUsage(); |
| MemoryUsage peak2 = mpool.getPeakUsage(); |
| |
| if (usage2.getUsed() >= usage1.getUsed()) { |
| throw new RuntimeException( |
| formatSize("Before GC: used", usage1.getUsed()) + " " + |
| " expected to be > " + |
| formatSize("After GC: used", usage2.getUsed())); |
| } |
| |
| if (peak2.getUsed() != peak1.getUsed()) { |
| throw new RuntimeException( |
| formatSize("Before GC: peak", peak1.getUsed()) + " " + |
| " expected to be equal to " + |
| formatSize("After GC: peak", peak2.getUsed())); |
| } |
| |
| mpool.resetPeakUsage(); |
| |
| System.out.println("After resetPeakUsage: "); |
| printMemoryUsage(); |
| |
| MemoryUsage usage3 = mpool.getUsage(); |
| MemoryUsage peak3 = mpool.getPeakUsage(); |
| |
| if (peak3.getUsed() != usage3.getUsed()) { |
| throw new RuntimeException( |
| formatSize("After resetting peak: peak", peak3.getUsed()) + " " + |
| " expected to be equal to " + |
| formatSize("current used", usage3.getUsed())); |
| } |
| |
| if (peak3.getUsed() >= peak2.getUsed()) { |
| throw new RuntimeException( |
| formatSize("After resetting peak: peak", peak3.getUsed()) + " " + |
| " expected to be < " + |
| formatSize("previous peak", peak2.getUsed())); |
| } |
| |
| System.out.println("Test passed."); |
| } |
| |
| private static String INDENT = " "; |
| private static void printMemoryUsage() { |
| MemoryUsage current = mpool.getUsage(); |
| MemoryUsage peak = mpool.getPeakUsage(); |
| System.out.println("Current Usage: "); |
| MemoryUtil.printMemoryUsage(current); |
| System.out.println("Peak Usage: "); |
| MemoryUtil.printMemoryUsage(peak); |
| |
| } |
| private static String formatSize(String name, long value) { |
| StringBuffer buf = new StringBuffer(name + " = " + value); |
| if (value > 0) { |
| buf.append(" (" + (value >> 10) + "K)"); |
| } |
| return buf.toString(); |
| } |
| } |