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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.
*/
/*
* @test
* @key stress randomness
*
* @summary converted from VM Testbase gc/gctests/StringInternSyncWithGC.
* VM Testbase keywords: [gc, stress, stressopt, feature_perm_removal_jdk7, nonconcurrent]
* VM Testbase readme:
* The test verifies that String.intern is correctly synchronized with GC.
* Test interns and drop the same strings in different threads and provokes GC.
* Additionally test creates weak/soft references to interned strings.
* Test fails if any string object is inaccessible.
*
* @library /vmTestbase
* /test/lib
* @run main/othervm
* -Xlog:gc:gc.log
* gc.gctests.StringInternSyncWithGC.StringInternSyncWithGC
* -ms low
* -memUsage 3
* -appTimeout 30
* -capacityVerPart 2
*/
package gc.gctests.StringInternSyncWithGC;
import java.util.ArrayList;
import java.util.List;
import nsk.share.gc.*;
import nsk.share.gc.gp.MemoryStrategy;
import nsk.share.gc.gp.MemoryStrategyAware;
import nsk.share.gc.gp.string.RandomStringProducer;
import nsk.share.test.ExecutionController;
public class StringInternSyncWithGC extends ThreadedGCTest implements MemoryStrategyAware {
// Maximum size of one string
// Depends from all size and memory strategy
private int maxStringSize;
private MemoryStrategy memoryStrategy;
private final int memUsageFactor;
private final long endTimeCapacityVer;
// The list of strings which are interned during iteration
private final List<String> stringsToIntern = new ArrayList();
private final RandomStringProducer gp = new RandomStringProducer();
public StringInternSyncWithGC(int memUsage, long endTimeCapVer) {
memUsageFactor = memUsage;
endTimeCapacityVer = endTimeCapVer;
}
@Override
public void setMemoryStrategy(MemoryStrategy memoryStrategy) {
this.memoryStrategy = memoryStrategy;
}
/**
* Verify that we could use certain amount of memory.
*/
private boolean verifyInternedStringCapacity(long initialSize) {
long currentSize = 0;
final int STEP = 1000;
int iter = 0;
char[] template = new char[(int) (initialSize / STEP)];
List<String> tmpList = new ArrayList<>(STEP);
try {
while (currentSize <= initialSize) {
if (endTimeCapacityVer < System.currentTimeMillis()) {
log.debug("Too long to verify interned string capacity");
log.debug("Silently pass.");
return false;
}
template[iter]++;
if (++iter == template.length) {
iter = 0;
}
String str = new String(template);
tmpList.add(str.intern());
currentSize += str.length() * 2; //each char costs 2 bytes
}
} catch (OutOfMemoryError oome) {
log.debug("It is not possible to allocate " + initialSize + " size of interned string.");
log.debug("Silently pass.");
return false;
}
return true;
}
@Override
public void run() {
long size = runParams.getTestMemory() / memUsageFactor;
if (!verifyInternedStringCapacity(size)) {
return;
}
// Approximate size occupied by all interned strings
long sizeOfAllInternedStrings = size / 2;
maxStringSize = (int) (sizeOfAllInternedStrings / memoryStrategy.getSize(sizeOfAllInternedStrings, Memory.getObjectExtraSize()));
// Each thread keeps reference to each created string.
long extraConsumption = runParams.getNumberOfThreads() * Memory.getReferenceSize();
log.debug("The overall size of interned strings : " + sizeOfAllInternedStrings / (1024 * 1024) + "M");
log.debug("The count of interned strings : " + sizeOfAllInternedStrings / (maxStringSize + extraConsumption));
for (long currentSize = 0; currentSize <= sizeOfAllInternedStrings;
currentSize += maxStringSize + extraConsumption) {
stringsToIntern.add(gp.create(maxStringSize));
}
super.run();
}
@Override
protected Runnable createRunnable(int threadId) {
return new StringGenerator(threadId, this);
}
public static void main(String[] args) {
int appTimeout = -1;
int memUsageFactor = 1;
// Part of time that function verifyInternedStringCapacity can take. Time = Application_Timeout / capacityVerTimePart
double capacityVerPart = 2;
for (int i = 0; i < args.length; ++i) {
switch (args[i]) {
case "-memUsage":
memUsageFactor = Integer.parseInt(args[i + 1]);
break;
case "-capacityVerPart":
capacityVerPart = Double.parseDouble(args[i + 1]);
break;
case "-appTimeout":
appTimeout = Integer.parseInt(args[i + 1]);
break;
default:
}
}
if (appTimeout == -1) {
throw new IllegalArgumentException("Specify -appTimeout.");
}
long endTimeCapacityVer = System.currentTimeMillis() + (long) (appTimeout / capacityVerPart * 60000);
GC.runTest(new StringInternSyncWithGC(memUsageFactor, endTimeCapacityVer), args);
}
protected List<String> getStringsToIntern() {
return stringsToIntern;
}
protected int getNumberOfThreads() {
return runParams.getNumberOfThreads();
}
protected RandomStringProducer getGarbageProducer() {
return gp;
}
protected int getMaxStringSize() {
return maxStringSize;
}
protected ExecutionController getExecController() {
return getExecutionController();
}
}
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