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/*
* Copyright (c) 2011, 2020, 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.ThreadMXBean;
import java.util.ArrayList;
import java.util.List;
import nsk.share.gc.gp.GarbageProducer;
import nsk.share.gc.gp.GarbageUtils;
import nsk.share.test.Stresser;
import nsk.share.test.LocalRandom;
public class MXBeanTestThread extends Thread {
/**
* BarrierHandler instance for synchronization with management thread
*/
protected BarrierHandler handler;
/**
* List where allocated objects are stored
*/
private List<Object> allocatedList;
/**
* Number of simultaneously running threads
*/
private static int threadCount;
/**
* Expected amount of memory allocated during stress test
*/
private long stressAllocatedBytes;
/**
* Maximum memory in bytes that one thread is allowed to use at once
*/
private long maxThreadMemory = 0;
/**
* GarbageProducer for objects creation
*/
private GarbageProducer gp;
/**
* Stresser instance for allocateStress()
*/
private Stresser stresser;
public static void warmUp(String garbageProducerId) {
MXBeanTestThread warmUpThread = new MXBeanTestThread(garbageProducerId) {
@Override
public void doWork() {
allocate();
}
};
warmUpThread.start();
do {
try {
warmUpThread.join();
} catch (InterruptedException ie) {}
} while(warmUpThread.isAlive());
}
/**
* Sets BarrierHandler for this thread
*
* @param handler BarrierHandler to synchronize with
*/
public void setHandler(BarrierHandler handler) {
this.handler = handler;
}
/**
* Returns an instance of MXBeanTestThread with already defined
* allocatedList List and GarbageProducer
*/
public MXBeanTestThread(String garbageProducerId) {
super(Integer.toString(++threadCount));
allocatedList = new ArrayList<Object>();
gp = GarbageUtils.getGarbageProducer(garbageProducerId);
maxThreadMemory = Runtime.getRuntime().maxMemory()/4;
}
/**
* Returns an instance of MXBeanTestThread with already defined
* allocatedList List and default GarbageProducer
*/
public MXBeanTestThread() {
this("intArr");
}
/**
* Returns an instance of MXBeanTestThread with already defined
* allocatedList List and Stresser
*/
public MXBeanTestThread(Stresser stresser) {
this("intArr");
this.stresser = stresser;
}
/**
* Sets maximum amount of memory that could be used at once for each
* TestThread in StressTest
*/
public void setMaxThreadMemory (long memory) {
maxThreadMemory = memory;
}
/**
* Returns expected memory allocated by TestThread during StressTest
* @return expected memory amount
*/
public long getStressAllocatedBytes() {
return stressAllocatedBytes;
}
@Override
public void run() {
doWork();
}
/**
* Implementation of TestThread behavior logic
*/
public void doWork() {
handler.ready();
allocate();
handler.ready();
}
/**
* Allocates memory for amount of time specified in Stresser instance
*/
protected void allocateStress() {
// Size of long[] array that allocates 2 Mb + 1 byte
int MAX_ARR_SIZE=262146;
// Anount of memory allocated by thread with existing links
// Which means that these objects can't be collected by GC
long actuallyAllocated = 0;
// ensure LocalRandom is loaded and has enough memory
LocalRandom.init();
try {
while (stresser.continueExecution()) {
//int chunkSize = LocalRandom.nextInt(MAX_OBJECT_SIZE);
//Object obj = gp.create(chunkSize);
int chunkSize = LocalRandom.nextInt(MAX_ARR_SIZE);
Object obj = new long[chunkSize];
allocatedList.add(obj);
actuallyAllocated += chunkSize*8;
if (actuallyAllocated > maxThreadMemory) {
// Allocated more then allowed to one thread
// re-define allocatedList to allow GC to delete
// created objects
stressAllocatedBytes += actuallyAllocated;
actuallyAllocated = 0;
allocatedList = new ArrayList<Object>();
}
}
} catch (OutOfMemoryError e) {
} finally {
stressAllocatedBytes += actuallyAllocated;
}
}
/**
* Allocates memory once according test settings
*/
protected void allocate() {
long actuallyAllocated = 0;
for (int i = 0; i < ThreadMXBeanTestBase.allocArr.length; i++) {
long size = ThreadMXBeanTestBase.allocArr[i];
if (actuallyAllocated + size > maxThreadMemory) {
break;
}
allocatedList.add(gp.create(size));
actuallyAllocated += size;
}
}
}
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