/*
* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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/*
* @test Humongous.java
* @bug 7168848
* @summary G1: humongous object allocations should initiate marking cycles when necessary
* @run main/othervm -Xms100m -Xmx100m -XX:+PrintGC -XX:G1HeapRegionSize=1m -XX:+UseG1GC HumongousAlloc
*
*/
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.util.List;
public class HumongousAlloc {
public static byte[] dummy;
private static int sleepFreq = 40;
private static int sleepTime = 1000;
private static double size = 0.75;
private static int iterations = 50;
private static int MB = 1024 * 1024;
public static void allocate(int size, int sleepTime, int sleepFreq) throws InterruptedException {
System.out.println("Will allocate objects of size: " + size
+ " bytes and sleep for " + sleepTime
+ " ms after every " + sleepFreq + "th allocation.");
int count = 0;
while (count < iterations) {
for (int i = 0; i < sleepFreq; i++) {
dummy = new byte[size - 16];
}
Thread.sleep(sleepTime);
count++;
}
}
public static void main(String[] args) throws InterruptedException {
allocate((int) (size * MB), sleepTime, sleepFreq);
List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
for (GarbageCollectorMXBean collector : collectors) {
if (collector.getName().contains("G1 Old")) {
long count = collector.getCollectionCount();
if (count > 0) {
throw new RuntimeException("Failed: FullGCs should not have happened. The number of FullGC run is " + count);
}
else {
System.out.println("Passed.");
}
}
}
}
}