/** Constructs a PrintGCStat object to monitor a remote JVM. */
public PrintGCStat(MBeanServerConnection server) throws IOException {
// Create the platform mxbean proxies
this.rmbean = newPlatformMXBeanProxy(server, RUNTIME_MXBEAN_NAME, RuntimeMXBean.class);
this.mmbean = newPlatformMXBeanProxy(server, MEMORY_MXBEAN_NAME, MemoryMXBean.class);
ObjectName poolName = null;
ObjectName gcName = null;
try {
poolName = new ObjectName(MEMORY_POOL_MXBEAN_DOMAIN_TYPE + ",*");
gcName = new ObjectName(GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE + ",*");
} catch (MalformedObjectNameException e) {
// should not reach here
assert (false);
}
Set<ObjectName> mbeans = server.queryNames(poolName, null);
if (mbeans != null) {
pools = new ArrayList<MemoryPoolMXBean>();
for (ObjectName objName : mbeans) {
MemoryPoolMXBean p =
newPlatformMXBeanProxy(server, objName.getCanonicalName(), MemoryPoolMXBean.class);
pools.add(p);
}
}
mbeans = server.queryNames(gcName, null);
if (mbeans != null) {
gcmbeans = new ArrayList<GarbageCollectorMXBean>();
for (ObjectName objName : mbeans) {
GarbageCollectorMXBean gc =
newPlatformMXBeanProxy(
server, objName.getCanonicalName(), GarbageCollectorMXBean.class);
gcmbeans.add(gc);
}
}
}
public synchronized Collection<GarbageCollectorMXBean> getGarbageCollectorMXBeans()
throws IOException {
// TODO: How to deal with changes to the list??
if (garbageCollectorMBeans == null) {
ObjectName gcName = null;
try {
gcName = new ObjectName(GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE + ",*");
} catch (MalformedObjectNameException e) {
// should not reach here
assert (false);
}
Set<ObjectName> mbeans = server.queryNames(gcName, null);
if (mbeans != null) {
garbageCollectorMBeans = new ArrayList<GarbageCollectorMXBean>();
Iterator<ObjectName> iterator = mbeans.iterator();
while (iterator.hasNext()) {
ObjectName on = (ObjectName) iterator.next();
String name = GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE + ",name=" + on.getKeyProperty("name");
GarbageCollectorMXBean mBean =
newPlatformMXBeanProxy(server, name, GarbageCollectorMXBean.class);
garbageCollectorMBeans.add(mBean);
}
}
}
return garbageCollectorMBeans;
}
private static void checkGarbageCollectionNotificationInfoContent(
GarbageCollectionNotificationInfo notif) throws Exception {
System.out.println("GC notification for " + notif.getGcName());
System.out.print("Action: " + notif.getGcAction());
System.out.println(" Cause: " + notif.getGcCause());
GcInfo info = notif.getGcInfo();
System.out.print("GC Info #" + info.getId());
System.out.print(" start:" + info.getStartTime());
System.out.print(" end:" + info.getEndTime());
System.out.println(" (" + info.getDuration() + "ms)");
Map<String, MemoryUsage> usage = info.getMemoryUsageBeforeGc();
List<String> pnames = new ArrayList<String>();
for (Map.Entry entry : usage.entrySet()) {
String poolname = (String) entry.getKey();
pnames.add(poolname);
MemoryUsage busage = (MemoryUsage) entry.getValue();
MemoryUsage ausage = (MemoryUsage) info.getMemoryUsageAfterGc().get(poolname);
if (ausage == null) {
throw new RuntimeException("After Gc Memory does not exist" + " for " + poolname);
}
System.out.println("Usage for pool " + poolname);
System.out.println(" Before GC: " + busage);
System.out.println(" After GC: " + ausage);
}
// check if memory usage for all memory pools are returned
List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
for (MemoryPoolMXBean p : pools) {
if (!pnames.contains(p.getName())) {
throw new RuntimeException(
"GcInfo does not contain " + "memory usage for pool " + p.getName());
}
}
}
List<Edge> detectDeadlock() {
Collection<Map<String, MapLockState>> collection =
(Collection<Map<String, MapLockState>>) callOnAllMembers(new LockInformationCallable());
List<Vertex> graph = new ArrayList<Vertex>();
for (Map<String, MapLockState> mapLockStateMap : collection) {
for (MapLockState map : mapLockStateMap.values()) {
for (Object key : map.getLockOwners().keySet()) {
Vertex owner = new Vertex(map.getLockOwners().get(key));
Vertex requester = new Vertex(map.getLockRequested().get(key));
int index = graph.indexOf(owner);
if (index >= 0) {
owner = graph.get(index);
} else {
graph.add(owner);
}
index = graph.indexOf(requester);
if (index >= 0) {
requester = graph.get(index);
} else {
graph.add(requester);
}
Edge edge = new Edge();
edge.from = requester;
edge.to = owner;
edge.key = key;
edge.mapName = map.getMapName();
edge.globalLock = map.isGlobalLock();
owner.addIncoming(edge);
requester.addOutgoing(edge);
}
}
}
List<Edge> list = new ArrayList<Edge>();
if (graph != null && graph.size() > 0) {
try {
graph.get(0).visit(list);
} catch (RuntimeException e) {
}
}
return list;
}
public static void main(String[] args) throws InterruptedException, NoSuchMethodException {
int nthreads = Integer.parseInt(args[0]);
int ncounters = Integer.parseInt(args[1]);
String type = args[2];
int nexecutions = Integer.parseInt(args[3]);
List<Counter> counters = new ArrayList<Counter>();
for (int i = 0; i < ncounters; i++) {
Lock lock;
if (type.equals("s")) lock = new safe.ReentrantLock();
else if (type.equals("d")) lock = new safe.ReentrantLockDirect();
else lock = new java.util.concurrent.locks.ReentrantLock();
counters.add(new Counter(lock));
}
runExecutionBoundedTest(nthreads, counters, nexecutions);
}
private static void runExecutionBoundedTest(int nthreads, List<Counter> counters, int nexecutions)
throws InterruptedException {
final List<CounterThread> threads = new ArrayList<CounterThread>();
for (int i = 0; i < nthreads; i++) {
CounterThread t;
t = new CounterThread(counters.get(i % counters.size()), nexecutions);
t.start();
threads.add(t);
}
CounterThread.shoot(); // let all the threads go crazy at the same time
for (int i = 0; i < nthreads; i++) {
CounterThread t = threads.get(i);
t.join(30000);
if (t.isAlive()) {
System.out.println("stuck thread name: " + t.toString());
System.out.println("stuck thread state: " + t.getState());
safe.ReentrantLock l = (safe.ReentrantLock) t.getLock();
System.out.println("thread waiting lock: " + l);
System.out.println("stuck thread increments: " + t.getExecutions());
System.out.println("stuck thread counter value: " + t.getCounterCount());
Thread other = l.getOwner();
System.out.println("lock owner: " + other);
if (other != null) {
System.out.println("owner name: " + other.toString());
System.out.println("state owner: " + other.getState());
}
// Keep program alive to dump thread stacks with: jstack -l $(pidof java)
System.out.println(
java.lang.management.ManagementFactory.getThreadMXBean().getPeakThreadCount());
while (true) {}
}
}
long sum = 0;
for (int i = 0; i < counters.size(); ++i) {
sum += counters.get(i).getCount();
}
System.out.println(sum);
System.out.println(
java.lang.management.ManagementFactory.getThreadMXBean().getPeakThreadCount());
}
public Collection<MemoryPoolProxy> getMemoryPoolProxies() throws IOException {
// TODO: How to deal with changes to the list??
if (memoryPoolProxies == null) {
ObjectName poolName = null;
try {
poolName = new ObjectName(MEMORY_POOL_MXBEAN_DOMAIN_TYPE + ",*");
} catch (MalformedObjectNameException e) {
// should not reach here
assert (false);
}
Set<ObjectName> mbeans = server.queryNames(poolName, null);
if (mbeans != null) {
memoryPoolProxies = new ArrayList<MemoryPoolProxy>();
Iterator<ObjectName> iterator = mbeans.iterator();
while (iterator.hasNext()) {
ObjectName objName = (ObjectName) iterator.next();
MemoryPoolProxy p = new MemoryPoolProxy(this, objName);
memoryPoolProxies.add(p);
}
}
}
return memoryPoolProxies;
}