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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.
*/
/*
* The -XX:MarkSweepAlwaysCompactCount=1 argument below makes sure serial gc
* compacts the heap at every full gc so that the usage is correctly updated.
*/
/*
* @test
* @bug 4892507
* @summary Basic Test for MemoryPool.resetPeakUsage()
* @author Mandy Chung
*
* @requires vm.opt.ExplicitGCInvokesConcurrent != "true"
* @requires vm.opt.DisableExplicitGC != "true"
* @library /lib/testlibrary/ /test/lib
* @modules jdk.management
*
* @build jdk.testlibrary.* ResetPeakMemoryUsage MemoryUtil RunUtil
* @build sun.hotspot.WhiteBox
* @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. ResetPeakMemoryUsage
*/
import java.lang.management.*;
import java.lang.ref.WeakReference;
import java.util.*;
import sun.hotspot.code.Compiler;
public class ResetPeakMemoryUsage {
private static MemoryMXBean mbean = ManagementFactory.getMemoryMXBean();
// make public so that it can't be optimized away easily
public static Object[] obj;
/**
* Run the test multiple times with different GC versions.
* First with default command line specified by the framework.
* Then with all GC versions specified by the test.
*/
public static void main(String a[]) throws Throwable {
final String main = "ResetPeakMemoryUsage$TestMain";
final String ms = "-Xms256m";
final String mn = "-Xmn8m";
if (!Compiler.isGraalEnabled()) { // Graal does not support CMS
RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseConcMarkSweepGC");
}
RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseParallelGC");
RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseG1GC", "-XX:G1HeapRegionSize=1m");
RunUtil.runTestClearGcOpts(main, ms, mn, "-XX:+UseSerialGC",
"-XX:MarkSweepAlwaysCompactCount=1");
}
private static class TestMain {
public static void main(String[] argv) {
List pools = ManagementFactory.getMemoryPoolMXBeans();
ListIterator iter = pools.listIterator();
boolean found = false;
while (iter.hasNext()) {
MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next();
// only check heap pools that support usage threshold
// this is typically only the old generation space
// since the other spaces are expected to get filled up
if (p.getType() == MemoryType.HEAP &&
p.isUsageThresholdSupported())
{
found = true;
testPool(p);
}
}
if (!found) {
throw new RuntimeException("No heap pool found");
}
}
}
private static void testPool(MemoryPoolMXBean mpool) {
System.out.println("Selected memory pool: ");
MemoryUtil.printMemoryPool(mpool);
MemoryUsage usage0 = mpool.getUsage();
MemoryUsage peak0 = mpool.getPeakUsage();
// use a size that is larger than the young generation and G1 regions
// to force the array into the old gen
int largeArraySize = 9 * 1000 * 1000;
System.out.println("Before big object array (of size "+largeArraySize+") is allocated: ");
printMemoryUsage(usage0, peak0);
obj = new Object[largeArraySize];
WeakReference<Object> weakRef = new WeakReference<>(obj);
MemoryUsage usage1 = mpool.getUsage();
MemoryUsage peak1 = mpool.getPeakUsage();
System.out.println("After the object is allocated: ");
printMemoryUsage(usage1, peak1);
if (usage1.getUsed() <= usage0.getUsed()) {
throw new RuntimeException(
formatSize("Before allocation: used", usage0.getUsed()) +
" expected to be < " +
formatSize("After allocation: used", usage1.getUsed()));
}
if (peak1.getUsed() <= peak0.getUsed()) {
throw new RuntimeException(
formatSize("Before allocation: peak", peak0.getUsed()) +
" expected to be < " +
formatSize("After allocation: peak", peak1.getUsed()));
}
// The object is now garbage and do a GC
// memory usage should drop
obj = null;
//This will cause sure shot GC unlike Runtime.gc() invoked by mbean.gc()
while(weakRef.get() != null) {
mbean.gc();
}
MemoryUsage usage2 = mpool.getUsage();
MemoryUsage peak2 = mpool.getPeakUsage();
System.out.println("After GC: ");
printMemoryUsage(usage2, peak2);
if (usage2.getUsed() >= usage1.getUsed()) {
throw new RuntimeException(
formatSize("Before GC: used", usage1.getUsed()) + " " +
" expected to be > " +
formatSize("After GC: used", usage2.getUsed()));
}
mpool.resetPeakUsage();
MemoryUsage usage3 = mpool.getUsage();
MemoryUsage peak3 = mpool.getPeakUsage();
System.out.println("After resetPeakUsage: ");
printMemoryUsage(usage3, peak3);
if (peak3.getUsed() != usage3.getUsed()) {
throw new RuntimeException(
formatSize("After resetting peak: peak", peak3.getUsed()) + " " +
" expected to be equal to " +
formatSize("current used", usage3.getUsed()));
}
if (peak3.getUsed() >= peak2.getUsed()) {
throw new RuntimeException(
formatSize("After resetting peak: peak", peak3.getUsed()) + " " +
" expected to be < " +
formatSize("previous peak", peak2.getUsed()));
}
System.out.println(RunUtil.successMessage);
}
private static String INDENT = " ";
private static void printMemoryUsage(MemoryUsage current, MemoryUsage peak) {
System.out.println("Current Usage: ");
MemoryUtil.printMemoryUsage(current);
System.out.println("Peak Usage: ");
MemoryUtil.printMemoryUsage(peak);
}
private static String formatSize(String name, long value) {
StringBuffer buf = new StringBuffer(name + " = " + value);
if (value > 0) {
buf.append(" (" + (value >> 10) + "K)");
}
return buf.toString();
}
}
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