test/java/lang/management/MemoryMXBean/CollectionUsageThreshold.java
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@@ -1,7 +1,7 @@
/*
- * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2013, 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.
@@ -29,107 +29,109 @@
* 2) test notification emitted for two different memory pools.
*
* @author Mandy Chung
*
* @build CollectionUsageThreshold MemoryUtil
- * @run main/timeout=300 CollectionUsageThreshold
+ * @run main/othervm/timeout=300 -XX:+PrintGCDetails -XX:+UseSerialGC CollectionUsageThreshold
+ * @run main/othervm/timeout=300 -XX:+PrintGCDetails -XX:+UseParallelGC CollectionUsageThreshold
+ * @run main/othervm/timeout=300 -XX:+PrintGCDetails -XX:+UseG1GC CollectionUsageThreshold
+ * @run main/othervm/timeout=300 -XX:+PrintGCDetails -XX:+UseConcMarkSweepGC CollectionUsageThreshold
+ * @run main/othervm/timeout=300 -XX:+PrintGCDetails -Xmx2m -XX:+UseConcMarkSweepGC -XX:+ExplicitGCInvokesConcurrent CollectionUsageThreshold
+ * @run main/othervm/timeout=300 -XX:+PrintGCDetails -Xmx2m -XX:+UseG1GC -XX:+ExplicitGCInvokesConcurrent CollectionUsageThreshold
*/
-import java.lang.Thread.*;
-import java.lang.management.*;
import java.util.*;
import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicInteger;
import javax.management.*;
import javax.management.openmbean.CompositeData;
+import java.lang.management.*;
+import static java.lang.management.MemoryNotificationInfo.*;;
+import static java.lang.management.ManagementFactory.*;
public class CollectionUsageThreshold {
- private static MemoryMXBean mm = ManagementFactory.getMemoryMXBean();
- private static List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
- private static List<MemoryManagerMXBean> managers = ManagementFactory.getMemoryManagerMXBeans();
- private static Map<String, PoolRecord> result = new HashMap<>();
+ private static final MemoryMXBean mm = getMemoryMXBean();
+ private static final Map<String, PoolRecord> result = new HashMap<>();
private static boolean trace = false;
- private static boolean testFailed = false;
- private static int numMemoryPools = 1;
+ private static volatile int numMemoryPools = 1;
private static final int NUM_GCS = 3;
private static final int THRESHOLD = 10;
- private static Checker checker;
- private static int numGCs = 0;
+ private static volatile int numGCs = 0;
// semaphore to signal the arrival of a low memory notification
- private static Semaphore signals = new Semaphore(0);
+ private static final Semaphore signals = new Semaphore(0);
// barrier for the main thread to wait until the checker thread
// finishes checking the low memory notification result
- private static CyclicBarrier barrier = new CyclicBarrier(2);
+ private static final CyclicBarrier barrier = new CyclicBarrier(2);
+ private static final int ARRAY_SIZE = 1 << 18;
static class PoolRecord {
- private MemoryPoolMXBean pool;
- private int listenerInvoked = 0;
- private long notifCount = 0;
+ private final MemoryPoolMXBean pool;
+ private final AtomicInteger listenerInvoked = new AtomicInteger(0);
+ private volatile long notifCount = 0;
PoolRecord(MemoryPoolMXBean p) {
this.pool = p;
}
int getListenerInvokedCount() {
- return listenerInvoked;
+ return listenerInvoked.get();
}
long getNotifCount() {
return notifCount;
}
MemoryPoolMXBean getPool() {
return pool;
}
void addNotification(MemoryNotificationInfo minfo) {
- listenerInvoked++;
+ listenerInvoked.incrementAndGet();
notifCount = minfo.getCount();
}
}
static class SensorListener implements NotificationListener {
- private int numNotifs = 0;
+ @Override
public void handleNotification(Notification notif, Object handback) {
String type = notif.getType();
- if (type.equals(MemoryNotificationInfo.MEMORY_THRESHOLD_EXCEEDED) ||
- type.equals(MemoryNotificationInfo.
- MEMORY_COLLECTION_THRESHOLD_EXCEEDED)) {
+ if (MEMORY_THRESHOLD_EXCEEDED.equals(type) ||
+ MEMORY_COLLECTION_THRESHOLD_EXCEEDED.equals(type)) {
MemoryNotificationInfo minfo = MemoryNotificationInfo.
from((CompositeData) notif.getUserData());
MemoryUtil.printMemoryNotificationInfo(minfo, type);
PoolRecord pr = (PoolRecord) result.get(minfo.getPoolName());
if (pr == null) {
throw new RuntimeException("Pool " + minfo.getPoolName() +
" is not selected");
}
- if (type != MemoryNotificationInfo.
- MEMORY_COLLECTION_THRESHOLD_EXCEEDED) {
+ if (!MEMORY_COLLECTION_THRESHOLD_EXCEEDED.equals(type)) {
throw new RuntimeException("Pool " + minfo.getPoolName() +
" got unexpected notification type: " +
type);
}
pr.addNotification(minfo);
synchronized (this) {
System.out.println("notifying the checker thread to check result");
- numNotifs++;
signals.release();
}
}
}
}
- private static long newThreshold;
public static void main(String args[]) throws Exception {
if (args.length > 0 && args[0].equals("trace")) {
trace = true;
}
+ List<MemoryPoolMXBean> pools = getMemoryPoolMXBeans();
+ List<MemoryManagerMXBean> managers = getMemoryManagerMXBeans();
+
if (trace) {
MemoryUtil.printMemoryPools(pools);
MemoryUtil.printMemoryManagers(managers);
}
// Find the Old generation which supports low memory detection
for (MemoryPoolMXBean p : pools) {
- MemoryUsage u = p.getUsage();
if (p.isUsageThresholdSupported() && p.isCollectionUsageThresholdSupported()) {
if (p.getName().toLowerCase().contains("perm")) {
// if we have a "perm gen" pool increase the number of expected
// memory pools by one.
numMemoryPools++;
@@ -147,11 +149,11 @@
try {
// This test creates a checker thread responsible for checking
// the low memory notifications. It blocks until a permit
// from the signals semaphore is available.
- checker = new Checker("Checker thread");
+ Checker checker = new Checker("Checker thread");
checker.setDaemon(true);
checker.start();
for (PoolRecord pr : result.values()) {
pr.getPool().setCollectionUsageThreshold(THRESHOLD);
@@ -180,21 +182,18 @@
// restore the default
for (PoolRecord pr : result.values()) {
pr.getPool().setCollectionUsageThreshold(0);
}
}
-
- if (testFailed)
- throw new RuntimeException("TEST FAILED.");
-
System.out.println("Test passed.");
-
}
private static void invokeGC() {
System.out.println("Calling System.gc()");
+ // create a big object to make sure the old gen usage across the threshold
+ byte[] arr = new byte[ARRAY_SIZE];
numGCs++;
mm.gc();
if (trace) {
for (PoolRecord pr : result.values()) {
@@ -203,24 +202,20 @@
}
}
}
static class Checker extends Thread {
- private boolean checkerReady = false;
- private int waiters = 0;
- private boolean readyToCheck = false;
Checker(String name) {
super(name);
};
+ @Override
public void run() {
while (true) {
try {
signals.acquire(numMemoryPools);
checkResult();
- } catch (InterruptedException e) {
- throw new RuntimeException(e);
- } catch (BrokenBarrierException e) {
+ } catch (InterruptedException | BrokenBarrierException e) {
throw new RuntimeException(e);
}
}
}
private void checkResult() throws InterruptedException, BrokenBarrierException {