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/*
* Copyright (c) 2003, 2018, 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 nsk.monitoring.stress.lowmem;
import java.io.OutputStream;
import java.io.PrintStream;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryType;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import nsk.share.Log;
import nsk.share.TestFailure;
import nsk.share.gc.GC;
import nsk.share.gc.ThreadedGCTest;
import nsk.share.gc.gp.GarbageProducer;
import nsk.share.gc.gp.array.ByteArrayProducer;
import nsk.share.gc.gp.classload.GeneratedClassProducer;
import nsk.monitoring.share.*;
import nsk.share.test.ExecutionController;
public class lowmem001 extends ThreadedGCTest {
// The max heap usage after whih we free memory and restart
static final int MAX_HEAP_USAGE = 70;
// isOOM is used to stop allocation and free resources
// immediately after first OOME
// really it could be only if we didn't check usage in time
static AtomicBoolean isOOM = new AtomicBoolean(false);
static ArgumentHandler argHandler;
MemoryMonitor monitor;
public static void main(String[] args) {
argHandler = new ArgumentHandler(args);
GC.runTest(new lowmem001(), args);
}
@Override
public void run() {
Log log = new Log(System.out, true);
// System.err is duplicated into buffer
// it should be empty
MyStream stream = new MyStream(System.err);
System.setErr(new PrintStream(stream));
monitor = Monitor.getMemoryMonitor(log, argHandler);
try {
monitor.enableMonitoring();
monitor.updateThresholds();
super.run();
monitor.disableMonitoring();
} catch (Exception e) {
throw new TestFailure(e);
}
if (isOOM.get() == true) {
log.display("The OOME happened during test");
// We control memory at 70 %
// each time when we want to eat 512 bytes
// if we got OOME it is really ugly
throw new TestFailure("OOME should not happened.");
}
if (!monitor.getPassedStatus()) {
throw new TestFailure("MemoryMonitor fails. See log.");
}
if (!stream.isEmpty()) {
String string = stream.getString();
if (string.contains("java.lang.OutOfMemoryError")) {
log.display("WARNING: The System.err contains OutOfMemory.");
// the OOME is not error
log.complain(string);
return;
}
log.complain(string);
throw new TestFailure("Error stream is not empty.");
}
}
@Override
protected Runnable createRunnable(int i) {
String memory = argHandler.getTestedMemory();
if (memory.equals(MemoryMonitor.HEAP_TYPE)) {
return new HeapStresser();
}
if (memory.equals(MemoryMonitor.NONHEAP_TYPE)) {
return new ClassStresser();
}
// mixed type
return i % 2 == 0 ? new HeapStresser() : new ClassStresser();
}
/*
* Simple ClassLoader is used for non-heap stressing
* should be revised after permgen removal
*/
class ClassStresser extends Thread {
@Override
public void run() {
ExecutionController stresser = getExecutionController();
GeneratedClassProducer gp = new GeneratedClassProducer();
while (stresser.continueExecution()) {
try {
gp.create(0);
} catch (OutOfMemoryError e) {
// drop 'gc', reset Thresholds and start new iteration
monitor.resetThresholds(MemoryType.NON_HEAP);
return;
}
}
}
};
class HeapStresser extends Thread {
final long chunkSize = 512;
List storage;
GarbageProducer gp = new ByteArrayProducer();
@Override
public void run() {
storage = new LinkedList();
ExecutionController stresser = getExecutionController();
MemoryMXBean bean = ManagementFactory.getMemoryMXBean();
while (stresser.continueExecution()) {
try {
storage.add(gp.create(chunkSize + new Object().hashCode() % 31));
storage.add(gp.create(chunkSize));
storage.remove(0);
if (isOOM.get() == true || !stresser.continueExecution()) {
stresser.finish();
storage = null;
return;
}
if (Thread.currentThread().isInterrupted()) {
break;
}
// If memory is low free resources and restart
if (bean.getHeapMemoryUsage().getUsed()
> bean.getHeapMemoryUsage().getMax() * MAX_HEAP_USAGE / 100) {
storage = new LinkedList();
monitor.resetThresholds(MemoryType.HEAP);
}
} catch (OutOfMemoryError e) {
// Let finish, the managment/memorymonitor could be
// corrupted after OOME
storage = null;
isOOM.set(true);
stresser.finish();
return;
}
}
}
}
static class MyStream extends OutputStream {
PrintStream err;
public MyStream(PrintStream err) {
this.err = err;
}
private final static int SIZE = 100000;
private char[] value = new char[SIZE];
private int count = 0;
// No additional memory allocation during write
@Override
public synchronized void write(int b) {
if (count < SIZE) {
value[count++] = (char) b;
}
try {
err.write(b);
} catch (OutOfMemoryError oome) {
isOOM.set(true);
}
}
public String getString() {
return new String(value, 0, count);
}
public boolean isEmpty() {
return count == 0;
}
}
}
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