| /* |
| * Copyright (c) 2016, 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. |
| */ |
| |
| /* |
| * @test TestStressG1Humongous |
| * @key gc |
| * @key stress |
| * @summary Stress G1 by humongous allocations in situation near OOM |
| * @requires vm.gc.G1 |
| * @requires !vm.flightRecorder |
| * @run main/othervm/timeout=200 -Xlog:gc=debug -Xmx1g -XX:+UseG1GC -XX:G1HeapRegionSize=4m |
| * -Dtimeout=120 -Dthreads=3 -Dhumongoussize=1.1 -Dregionsize=4 TestStressG1Humongous |
| * @run main/othervm/timeout=200 -Xlog:gc=debug -Xmx1g -XX:+UseG1GC -XX:G1HeapRegionSize=16m |
| * -Dtimeout=120 -Dthreads=5 -Dhumongoussize=2.1 -Dregionsize=16 TestStressG1Humongous |
| * @run main/othervm/timeout=200 -Xlog:gc=debug -Xmx1g -XX:+UseG1GC -XX:G1HeapRegionSize=32m |
| * -Dtimeout=120 -Dthreads=4 -Dhumongoussize=0.6 -Dregionsize=32 TestStressG1Humongous |
| * @run main/othervm/timeout=700 -Xlog:gc=debug -Xmx1g -XX:+UseG1GC -XX:G1HeapRegionSize=1m |
| * -Dtimeout=600 -Dthreads=7 -Dhumongoussize=0.6 -Dregionsize=1 TestStressG1Humongous |
| */ |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Collections; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| public class TestStressG1Humongous { |
| |
| // Timeout in seconds |
| private static final int TIMEOUT = Integer.getInteger("timeout", 60); |
| private static final int THREAD_COUNT = Integer.getInteger("threads", 2); |
| private static final int REGION_SIZE = Integer.getInteger("regionsize", 1) * 1024 * 1024; |
| private static final int HUMONGOUS_SIZE = (int) (REGION_SIZE * Double.parseDouble(System.getProperty("humongoussize", "1.5"))); |
| private static final int NUMBER_OF_FREE_REGIONS = 2; |
| |
| private volatile boolean isRunning; |
| private final ExecutorService threadExecutor; |
| private final AtomicInteger alocatedObjectsCount; |
| private CountDownLatch countDownLatch; |
| public static final List<Object> GARBAGE = Collections.synchronizedList(new ArrayList<>()); |
| |
| public static void main(String[] args) throws InterruptedException { |
| new TestStressG1Humongous().run(); |
| } |
| |
| public TestStressG1Humongous() { |
| isRunning = true; |
| threadExecutor = Executors.newFixedThreadPool(THREAD_COUNT + 1); |
| alocatedObjectsCount = new AtomicInteger(0); |
| } |
| |
| private void run() throws InterruptedException { |
| threadExecutor.submit(new Timer()); |
| int checkedAmountOfHObjects = getExpectedAmountOfObjects(); |
| while (isRunning()) { |
| countDownLatch = new CountDownLatch(THREAD_COUNT); |
| startAllocationThreads(checkedAmountOfHObjects); |
| countDownLatch.await(); |
| GARBAGE.clear(); |
| System.out.println("Allocated " + alocatedObjectsCount.get() + " objects."); |
| alocatedObjectsCount.set(0); |
| } |
| threadExecutor.shutdown(); |
| System.out.println("Done!"); |
| } |
| |
| /** |
| * Tries to fill available memory with humongous objects to get expected amount. |
| * @return expected amount of humongous objects |
| */ |
| private int getExpectedAmountOfObjects() { |
| long maxMem = Runtime.getRuntime().maxMemory(); |
| int expectedHObjects = (int) (maxMem / HUMONGOUS_SIZE); |
| // Will allocate NUMBER_OF_FREE_REGIONS region less to give some free space for VM. |
| int checkedAmountOfHObjects = checkHeapCapacity(expectedHObjects) - NUMBER_OF_FREE_REGIONS; |
| if (checkedAmountOfHObjects <= 0) { |
| throw new RuntimeException("Cannot start testing because selected maximum heap " |
| + "is not large enough to contain more than " + NUMBER_OF_FREE_REGIONS + " regions"); |
| } |
| return checkedAmountOfHObjects; |
| } |
| |
| /** |
| * Starts several threads to allocate the requested amount of humongous objects. |
| * @param totalObjects total amount of object that will be created |
| */ |
| private void startAllocationThreads(int totalObjects) { |
| int objectsPerThread = totalObjects / THREAD_COUNT; |
| int objectsForLastThread = objectsPerThread + totalObjects % THREAD_COUNT; |
| for (int i = 0; i < THREAD_COUNT - 1; ++i) { |
| threadExecutor.submit(new AllocationThread(countDownLatch, objectsPerThread, alocatedObjectsCount)); |
| } |
| threadExecutor.submit(new AllocationThread(countDownLatch, objectsForLastThread, alocatedObjectsCount)); |
| } |
| |
| /** |
| * Creates a humongous object of the predefined size. |
| */ |
| private void createObject() { |
| GARBAGE.add(new byte[HUMONGOUS_SIZE]); |
| } |
| |
| /** |
| * Tries to create the requested amount of humongous objects. |
| * In case of OOME, stops creating and cleans the created garbage. |
| * @param expectedObjects amount of objects based on heap size |
| * @return amount of created objects |
| */ |
| private int checkHeapCapacity(int expectedObjects) { |
| int allocated = 0; |
| try { |
| while (isRunning() && allocated < expectedObjects) { |
| createObject(); |
| ++allocated; |
| } |
| } catch (OutOfMemoryError oome) { |
| GARBAGE.clear(); |
| } |
| return allocated; |
| } |
| |
| private void setDone() { |
| isRunning = false; |
| } |
| |
| private boolean isRunning() { |
| return isRunning; |
| } |
| |
| /** |
| * Thread which allocates requested amount of humongous objects. |
| */ |
| private class AllocationThread implements Runnable { |
| |
| private final int totalObjects; |
| private final CountDownLatch cdl; |
| private final AtomicInteger allocationCounter; |
| |
| /** |
| * Creates allocation thread |
| * @param cdl CountDownLatch |
| * @param objects amount of objects to allocate |
| * @param counter |
| */ |
| public AllocationThread(CountDownLatch cdl, int objects, AtomicInteger counter) { |
| totalObjects = objects; |
| this.cdl = cdl; |
| allocationCounter = counter; |
| } |
| |
| @Override |
| public void run() { |
| int allocatedObjects = 0; |
| try { |
| while (isRunning && allocatedObjects < totalObjects) { |
| createObject(); |
| allocatedObjects++; |
| allocationCounter.incrementAndGet(); |
| } |
| |
| } catch (OutOfMemoryError oome) { |
| GARBAGE.clear(); |
| System.out.print("OOME was caught."); |
| System.out.println(" Allocated in thread: " + allocatedObjects + " . Totally allocated: " + allocationCounter.get() + "."); |
| } finally { |
| cdl.countDown(); |
| } |
| } |
| } |
| |
| /** |
| * Simple Runnable which waits TIMEOUT and sets isRunning to false. |
| */ |
| class Timer implements Runnable { |
| |
| @Override |
| public void run() { |
| try { |
| Thread.sleep(TIMEOUT * 1000); |
| } catch (InterruptedException ex) { |
| } |
| setDone(); |
| } |
| } |
| } |