1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test TestStressG1Humongous 26 * @key gc 27 * @key stress 28 * @summary Stress G1 by humongous allocations in situation near OOM 29 * @requires vm.gc.G1 30 * @requires !vm.flightRecorder 31 * @run main/othervm/timeout=200 -Xlog:gc=debug -Xmx1g -XX:+UseG1GC -XX:G1HeapRegionSize=4m 32 * -Dtimeout=120 -Dthreads=3 -Dhumongoussize=1.1 -Dregionsize=4 TestStressG1Humongous 33 * @run main/othervm/timeout=200 -Xlog:gc=debug -Xmx1g -XX:+UseG1GC -XX:G1HeapRegionSize=16m 34 * -Dtimeout=120 -Dthreads=5 -Dhumongoussize=2.1 -Dregionsize=16 TestStressG1Humongous 35 * @run main/othervm/timeout=200 -Xlog:gc=debug -Xmx1g -XX:+UseG1GC -XX:G1HeapRegionSize=32m 36 * -Dtimeout=120 -Dthreads=4 -Dhumongoussize=0.6 -Dregionsize=32 TestStressG1Humongous 37 * @run main/othervm/timeout=700 -Xlog:gc=debug -Xmx1g -XX:+UseG1GC -XX:G1HeapRegionSize=1m 38 * -Dtimeout=600 -Dthreads=7 -Dhumongoussize=0.6 -Dregionsize=1 TestStressG1Humongous 39 */ 40 41 import java.util.ArrayList; 42 import java.util.List; 43 import java.util.Collections; 44 import java.util.concurrent.CountDownLatch; 45 import java.util.concurrent.ExecutorService; 46 import java.util.concurrent.Executors; 47 import java.util.concurrent.atomic.AtomicInteger; 48 49 public class TestStressG1Humongous { 50 51 // Timeout in seconds 52 private static final int TIMEOUT = Integer.getInteger("timeout", 60); 53 private static final int THREAD_COUNT = Integer.getInteger("threads", 2); 54 private static final int REGION_SIZE = Integer.getInteger("regionsize", 1) * 1024 * 1024; 55 private static final int HUMONGOUS_SIZE = (int) (REGION_SIZE * Double.parseDouble(System.getProperty("humongoussize", "1.5"))); 56 57 private volatile boolean isRunning; 58 private final ExecutorService threadExecutor; 59 private final AtomicInteger alocatedObjectsCount; 60 private CountDownLatch countDownLatch; 61 public static final List<Object> GARBAGE = Collections.synchronizedList(new ArrayList<>()); 62 63 public static void main(String[] args) throws InterruptedException { 64 new TestStressG1Humongous().run(); 65 } 66 67 public TestStressG1Humongous() { 68 isRunning = true; 69 threadExecutor = Executors.newFixedThreadPool(THREAD_COUNT + 1); 70 alocatedObjectsCount = new AtomicInteger(0); 71 } 72 73 private void run() throws InterruptedException { 74 threadExecutor.submit(new Timer()); 75 int checkedAmountOfHObjects = getExpectedAmountOfObjects(); 76 while (isRunning()) { 77 countDownLatch = new CountDownLatch(THREAD_COUNT); 78 startAllocationThreads(checkedAmountOfHObjects); 79 countDownLatch.await(); 80 GARBAGE.clear(); 81 System.out.println("Allocated " + alocatedObjectsCount.get() + " objects."); 82 alocatedObjectsCount.set(0); 83 } 84 threadExecutor.shutdown(); 85 System.out.println("Done!"); 86 } 87 88 /** 89 * Tries to fill available memory with humongous objects to get expected amount. 90 * @return expected amount of humongous objects 91 */ 92 private int getExpectedAmountOfObjects() { 93 long maxMem = Runtime.getRuntime().maxMemory(); 94 int expectedHObjects = (int) (maxMem / HUMONGOUS_SIZE); 95 // Will allocate 2 region less to give some free space for VM. 96 int checkedAmountOfHObjects = checkHeapCapacity(expectedHObjects) - 2; 97 return checkedAmountOfHObjects; 98 } 99 100 /** 101 * Starts several threads to allocate the requested amount of humongous objects. 102 * @param totalObjects total amount of object that will be created 103 */ 104 private void startAllocationThreads(int totalObjects) { 105 int objectsPerThread = totalObjects / THREAD_COUNT; 106 int objectsForLastThread = objectsPerThread + totalObjects % THREAD_COUNT; 107 for (int i = 0; i < THREAD_COUNT - 1; ++i) { 108 threadExecutor.submit(new AllocationThread(countDownLatch, objectsPerThread, alocatedObjectsCount)); 109 } 110 threadExecutor.submit(new AllocationThread(countDownLatch, objectsForLastThread, alocatedObjectsCount)); 111 } 112 113 /** 114 * Creates a humongous object of the predefined size. 115 */ 116 private void createObject() { 117 GARBAGE.add(new byte[HUMONGOUS_SIZE]); 118 } 119 120 /** 121 * Tries to create the requested amount of humongous objects. 122 * In case of OOME, stops creating and cleans the created garbage. 123 * @param expectedObjects amount of objects based on heap size 124 * @return amount of created objects 125 */ 126 private int checkHeapCapacity(int expectedObjects) { 127 int allocated = 0; 128 try { 129 while (isRunning() && allocated < expectedObjects) { 130 createObject(); 131 ++allocated; 132 } 133 } catch (OutOfMemoryError oome) { 134 GARBAGE.clear(); 135 } 136 return allocated; 137 } 138 139 private void setDone() { 140 isRunning = false; 141 } 142 143 private boolean isRunning() { 144 return isRunning; 145 } 146 147 /** 148 * Thread which allocates requested amount of humongous objects. 149 */ 150 private class AllocationThread implements Runnable { 151 152 private final int totalObjects; 153 private final CountDownLatch cdl; 154 private final AtomicInteger allocationCounter; 155 156 /** 157 * Creates allocation thread 158 * @param cdl CountDownLatch 159 * @param objects amount of objects to allocate 160 * @param counter 161 */ 162 public AllocationThread(CountDownLatch cdl, int objects, AtomicInteger counter) { 163 totalObjects = objects; 164 this.cdl = cdl; 165 allocationCounter = counter; 166 } 167 168 @Override 169 public void run() { 170 int allocatedObjects = 0; 171 try { 172 while (isRunning && allocatedObjects < totalObjects) { 173 createObject(); 174 allocatedObjects++; 175 allocationCounter.incrementAndGet(); 176 } 177 178 } catch (OutOfMemoryError oome) { 179 GARBAGE.clear(); 180 System.out.print("OOME was caught."); 181 System.out.println(" Allocated in thread: " + allocatedObjects + " . Totally allocated: " + allocationCounter.get() + "."); 182 } finally { 183 cdl.countDown(); 184 } 185 } 186 } 187 188 /** 189 * Simple Runnable which waits TIMEOUT and sets isRunning to false. 190 */ 191 class Timer implements Runnable { 192 193 @Override 194 public void run() { 195 try { 196 Thread.sleep(TIMEOUT * 1000); 197 } catch (InterruptedException ex) { 198 } 199 setDone(); 200 } 201 } 202 }