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*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
/*
* @test
* @bug 6173675 8231209
* @summary Basic test of ThreadMXBean.getThreadAllocatedBytes
* @author Paul Hohensee
*/
import java.lang.management.*;
public class ThreadAllocatedMemory {
private static com.sun.management.ThreadMXBean mbean =
(com.sun.management.ThreadMXBean)ManagementFactory.getThreadMXBean();
private static volatile boolean done = false;
private static volatile boolean done1 = false;
private static Object obj = new Object();
private static final int NUM_THREADS = 10;
private static Thread[] threads = new Thread[NUM_THREADS];
private static long[] sizes = new long[NUM_THREADS];
public static void main(String[] argv)
throws Exception {
testSupportEnableDisable();
// Test current thread two ways
testGetCurrentThreadAllocatedBytes();
testCurrentThreadGetThreadAllocatedBytes();
// Test a single thread that is not this one
testGetThreadAllocatedBytes();
// Test many threads that are not this one
testGetThreadsAllocatedBytes();
System.out.println("Test passed");
}
private static void testSupportEnableDisable() {
if (!mbean.isThreadAllocatedMemorySupported()) {
return;
}
// disable allocated memory measurement
if (mbean.isThreadAllocatedMemoryEnabled()) {
mbean.setThreadAllocatedMemoryEnabled(false);
}
if (mbean.isThreadAllocatedMemoryEnabled()) {
throw new RuntimeException(
"ThreadAllocatedMemory is expected to be disabled");
}
long s = mbean.getCurrentThreadAllocatedBytes();
if (s != -1) {
throw new RuntimeException(
"Invalid ThreadAllocatedBytes returned = " +
s + " expected = -1");
}
// enable allocated memory measurement
if (!mbean.isThreadAllocatedMemoryEnabled()) {
mbean.setThreadAllocatedMemoryEnabled(true);
}
if (!mbean.isThreadAllocatedMemoryEnabled()) {
throw new RuntimeException(
"ThreadAllocatedMemory is expected to be enabled");
}
}
private static void testGetCurrentThreadAllocatedBytes() {
long size = mbean.getCurrentThreadAllocatedBytes();
ensureValidSize(size);
// do some more allocation
doit();
checkResult(Thread.currentThread(), size,
mbean.getCurrentThreadAllocatedBytes());
}
private static void testCurrentThreadGetThreadAllocatedBytes() {
Thread curThread = Thread.currentThread();
long id = curThread.getId();
long size = mbean.getThreadAllocatedBytes(id);
ensureValidSize(size);
// do some more allocation
doit();
checkResult(curThread, size, mbean.getThreadAllocatedBytes(id));
}
private static void testGetThreadAllocatedBytes()
throws Exception {
// start a thread
done = false; done1 = false;
Thread curThread = new MyThread("MyThread");
curThread.start();
long id = curThread.getId();
// wait for thread to block after doing some allocation
waitUntilThreadBlocked(curThread);
long size = mbean.getThreadAllocatedBytes(id);
ensureValidSize(size);
// let thread go to do some more allocation
synchronized (obj) {
done = true;
obj.notifyAll();
}
// wait for thread to get going again. we don't care if we
// catch it in mid-execution or if it hasn't
// restarted after we're done sleeping.
goSleep(400);
checkResult(curThread, size, mbean.getThreadAllocatedBytes(id));
// let thread exit
synchronized (obj) {
done1 = true;
obj.notifyAll();
}
try {
curThread.join();
} catch (InterruptedException e) {
System.out.println("Unexpected exception is thrown.");
e.printStackTrace(System.out);
}
}
private static void testGetThreadsAllocatedBytes()
throws Exception {
// start threads
done = false; done1 = false;
for (int i = 0; i < NUM_THREADS; i++) {
threads[i] = new MyThread("MyThread-" + i);
threads[i].start();
}
// wait for threads to block after doing some allocation
waitUntilThreadsBlocked();
for (int i = 0; i < NUM_THREADS; i++) {
sizes[i] = mbean.getThreadAllocatedBytes(threads[i].getId());
ensureValidSize(sizes[i]);
}
// let threads go to do some more allocation
synchronized (obj) {
done = true;
obj.notifyAll();
}
// wait for threads to get going again. we don't care if we
// catch them in mid-execution or if some of them haven't
// restarted after we're done sleeping.
goSleep(400);
for (int i = 0; i < NUM_THREADS; i++) {
checkResult(threads[i], sizes[i],
mbean.getThreadAllocatedBytes(threads[i].getId()));
}
// let threads exit
synchronized (obj) {
done1 = true;
obj.notifyAll();
}
for (int i = 0; i < NUM_THREADS; i++) {
try {
threads[i].join();
} catch (InterruptedException e) {
System.out.println("Unexpected exception is thrown.");
e.printStackTrace(System.out);
break;
}
}
}
private static void ensureValidSize(long size) {
// implementation could have started measurement when
// measurement was enabled, in which case size can be 0
if (size < 0) {
throw new RuntimeException(
"Invalid allocated bytes returned = " + size);
}
}
private static void checkResult(Thread curThread,
long prev_size, long curr_size) {
if (curr_size < prev_size) {
throw new RuntimeException("Allocated bytes " + curr_size +
" expected >= " + prev_size);
}
System.out.println(curThread.getName() +
" Previous allocated bytes = " + prev_size +
" Current allocated bytes = " + curr_size);
}
private static void goSleep(long ms) throws Exception {
try {
Thread.sleep(ms);
} catch (InterruptedException e) {
System.out.println("Unexpected exception is thrown.");
throw e;
}
}
private static void waitUntilThreadBlocked(Thread thread)
throws Exception {
while (true) {
goSleep(100);
ThreadInfo info = mbean.getThreadInfo(thread.getId());
if (info.getThreadState() == Thread.State.WAITING) {
break;
}
}
}
private static void waitUntilThreadsBlocked()
throws Exception {
int count = 0;
while (count != NUM_THREADS) {
goSleep(100);
count = 0;
for (int i = 0; i < NUM_THREADS; i++) {
ThreadInfo info = mbean.getThreadInfo(threads[i].getId());
if (info.getThreadState() == Thread.State.WAITING) {
count++;
}
}
}
}
public static void doit() {
String tmp = "";
long hashCode = 0;
for (int counter = 0; counter < 1000; counter++) {
tmp += counter;
hashCode = tmp.hashCode();
}
System.out.println(Thread.currentThread().getName() +
" hashcode: " + hashCode);
}
static class MyThread extends Thread {
public MyThread(String name) {
super(name);
}
public void run() {
ThreadAllocatedMemory.doit();
synchronized (obj) {
while (!done) {
try {
obj.wait();
} catch (InterruptedException e) {
System.out.println("Unexpected exception is thrown.");
e.printStackTrace(System.out);
break;
}
}
}
long size1 = mbean.getThreadAllocatedBytes(getId());
ThreadAllocatedMemory.doit();
long size2 = mbean.getThreadAllocatedBytes(getId());
System.out.println(getName() + ": " +
"ThreadAllocatedBytes = " + size1 +
" ThreadAllocatedBytes = " + size2);
if (size1 > size2) {
throw new RuntimeException(getName() +
" ThreadAllocatedBytes = " + size1 +
" > ThreadAllocatedBytes = " + size2);
}
synchronized (obj) {
while (!done1) {
try {
obj.wait();
} catch (InterruptedException e) {
System.out.println("Unexpected exception is thrown.");
e.printStackTrace(System.out);
break;
}
}
}
}
}
}