testing/itest/performance/performance-test/src/test/java/org/apache/tuscany/sca/test/performance/PerformanceTestCase.java - tuscany-sca-2.x - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  * KIND, either express or implied.  See the License for the
  * specific language governing permissions and limitations
  * under the License.
  */
 package org.apache.tuscany.sca.test.performance;

 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.fail;

 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileWriter;
 import java.lang.management.ManagementFactory;
 import java.lang.management.MemoryMXBean;
 import java.lang.management.OperatingSystemMXBean;
 import java.lang.ref.WeakReference;

 import javax.management.MBeanServer;

 import org.apache.tuscany.sca.Node;
 import org.apache.tuscany.sca.TuscanyRuntime;
 import org.apache.tuscany.sca.core.ExtensionPointRegistry;
 import org.apache.tuscany.sca.core.FactoryExtensionPoint;
 import org.apache.tuscany.sca.core.UtilityExtensionPoint;
 import org.apache.tuscany.sca.databinding.jaxb.JAXBContextHelper;
 import org.apache.tuscany.sca.impl.NodeImpl;
 import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
 import org.apache.tuscany.sca.interfacedef.java.impl.JavaInterfaceFactoryImpl;
 import org.apache.tuscany.sca.test.performance.client.BeanA;
 import org.apache.tuscany.sca.test.performance.client.Helloworld;
 import org.junit.AfterClass;
 import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.Test;

 import com.sun.management.HotSpotDiagnosticMXBean;

 /*
  * A test looking at memory and runtime performance.
  * TODO - only a couple of memory tests to start with
  */
 public class PerformanceTestCase {

     public boolean writeHeapDump = true;

     private static BufferedWriter resultsFile = null;

     private TuscanyRuntime runtime;
     private Node node;
     private ExtensionPointRegistry extensionPointRegistry;
     private long lastTotal = 0;
     private long lastFree = 0;
     private long lastUsed = 0;

     @BeforeClass
     public static void setUp() throws Exception {
         FileWriter fileWriter = new FileWriter("out.txt");
         resultsFile = new BufferedWriter(fileWriter);
     }

     @AfterClass
     public static void tearDown() throws Exception {
         resultsFile.flush();
         resultsFile.close();
     }

     @Test
     public void testNodeStartStop() {
         dumpHeapStart("testInstallUninstall");

         printRuntimeStats("createRuntime");

         createRuntime();

         callNodeStartStopRepeatedly(100);

         waitForInput();

         dumpHeapEnd("testInstallUninstall_postNodeStop");

         printRuntimeStats("stopRuntime");

         stopRuntime();

         printRuntimeStats("destroyRuntime");

         destroyRuntime();

         printRuntimeStats("End");

         dumpHeapEnd("testInstallUninstall_postStop");
     }

     @Test
     public void testInstallUninstall() {
         dumpHeapStart("testInstallUninstall");

         printRuntimeStats("createRuntime");

         createRuntime();

         printRuntimeStats("createNode");

         createNode();

         callInstallUninstallRepeatedly(100);

         dumpHeapEnd("testInstallUninstall_postUninstall");

         checkCacheStatus();

         printRuntimeStats("stopNode");

         stopNode();

         printRuntimeStats("destroyNode");

         destroyNode();

         printRuntimeStats("stopRuntime");

         stopRuntime();

         printRuntimeStats("destroyRuntime");

         destroyRuntime();

         printRuntimeStats("End");

         dumpHeapEnd("testInstallUninstall_postStop");
     }


     @Test
     public void testCall() {
         dumpHeapStart("TestCall");

         printRuntimeStats("createRuntime");

         createRuntime();

         printRuntimeStats("createNode");

         createNode();

         printRuntimeStats("installContribution");

         installContribution();

         printRuntimeStats("startNode");

         startComposite();

         printRuntimeStats("callServiceRepeatedly 10000 times");

         callServiceRepeatedly(10000);

         printRuntimeStats("stopCompositeAndUninstallUnused");

         stopCompositeAndUninstallUnused();

         //printRuntimeStats("uninstallContribution");

         //uninstallContribution();
         dumpHeapEnd("TestCall_postUninstall");

         printRuntimeStats("stopNode");

         stopNode();

         printRuntimeStats("destroyNode");

         destroyNode();

         printRuntimeStats("stopRuntime");

         stopRuntime();

         printRuntimeStats("destroyRuntime");

         destroyRuntime();

         printRuntimeStats("End");

         dumpHeapEnd("TestCall_postStop");
     }

     public void checkCacheStatus(){
         UtilityExtensionPoint utilityExtensionPoint = extensionPointRegistry.getExtensionPoint(UtilityExtensionPoint.class);
         JAXBContextHelper jaxbContextHelper = utilityExtensionPoint.getUtility(JAXBContextHelper.class);

         Assert.assertEquals("JAXBContextCache > 1", 1, jaxbContextHelper.getJAXBContextCache().getCache().keySet().size());

         FactoryExtensionPoint factoryExtensionPoint = extensionPointRegistry.getExtensionPoint(FactoryExtensionPoint.class);
         JavaInterfaceFactory javaInterfaceFactory = factoryExtensionPoint.getFactory(JavaInterfaceFactory.class);
         Assert.assertEquals("JavaInterfaceFactoryImpl.normalCache > 1", 1, ((JavaInterfaceFactoryImpl)javaInterfaceFactory).getNormalCache().keySet().size());

     }

     // ============================================================

     public void callNodeStartStopRepeatedly(int repeatCount) {
         for (int i =0; i < repeatCount; i++){
             printRuntimeStats("createNode");

             createNode();

             callInstallUninstallRepeatedly(1);

             printRuntimeStats("stopNode");

             stopNode();

             printRuntimeStats("destroyNode");

             destroyNode();
         }
     }

     public void callInstallUninstallRepeatedly(int repeatCount) {
         for (int i =0; i < repeatCount; i++){
             printRuntimeStats("install/unistall contribution");

             installContribution();

             startComposite();

             callService();

             stopCompositeAndUninstallUnused();

             //uninstallContribution();
         }
     }

     public void callServiceRepeatedly(int repeatCount) {
         for (int i =0; i < repeatCount; i++){
             callService();
         }
     }

     // ============================================================

     public void dumpHeapStart(String name){
         if (writeHeapDump){
             dumpHeap("heap_start_" + name + ".bin");
         }
     }

     public void dumpHeapEnd(String name){
         if (writeHeapDump){
             dumpHeap("heap_stop_" + name + ".bin");

             System.out.println("You can watch a JVM run using \n" +
                                " jconsole \n" +
                                "You can manually dump the heap using \n" +
                                " jmap -dump:file=heap_stop_" + name + ".bin 345" +
                                "Where 345 is the process id from jconsole \n" +
                                "The program dumps the heap at the start and end. You can look at them using \n" +
                                " jhat -J-Xmx512m heap_start.bin\n" +
                                " jhat -J-Xmx512m heap_stop_" + name + ".bin\n" +
                                "Then point your browser at\n" +
                                " http://localhost:7000/");
         } else {
             System.out.println("NO HEAP DUMPS WRITTEN");
         }
     }

     public void createRuntime() {
         runtime = TuscanyRuntime.newInstance();
     }

     public void createNode() {
         node = runtime.createNode("default");
         extensionPointRegistry = ((NodeImpl)node).getExtensionPointRegistry();
     }

     public void installContribution() {
         try {
             node.installContribution("performance", "../performance-contribution1/target/itest-performance-contribution1-2.5-SNAPSHOT.jar", null, null);
         } catch (Exception ex){
             ex.printStackTrace();
         }
     }

     public void startComposite() {
         try {
             node.startComposite("performance", "PerformanceTest.composite");
         } catch (Exception ex){
             ex.printStackTrace();
         }
     }

     public void stopCompositeAndUninstallUnused(){
         try {
             node.stopCompositeAndUninstallUnused("performance", "PerformanceTest.composite");
         } catch (Exception ex){
             ex.printStackTrace();
         }
     }

     public void uninstallContribution(){
         try {
             node.installContribution("performance");
         } catch (Exception ex){
             ex.printStackTrace();
         }
     }

     public void stopNode(){
         node.stop();
     }

     public void destroyNode() {
         node = null;
     }

     public void stopRuntime() {
         runtime.stop();
     }

     public void destroyRuntime() {
         runtime = null;
     }

     public void callService() {
         try {
             Helloworld helloWorldClient = node.getService(Helloworld.class, "HelloWorldClientComponent");

             assertNotNull(helloWorldClient);

             BeanA beanA = new BeanA();
             beanA.setField1("Smith");
             beanA.setField2(13);

             assertEquals("Hello Hello Jane Smith", helloWorldClient.sayHello("Jane", beanA));
         } catch (Exception ex) {
             fail(ex.toString());
         }
     }

     public void printRuntimeStats(String step){
         tryToGC();

         Runtime runtime = Runtime.getRuntime();

         long used  = runtime.totalMemory() - runtime.freeMemory();
         long free  = runtime.freeMemory();
         long total = runtime.totalMemory();

         String stats = "U " + used  + "[" + (used  - lastUsed ) + "] \t" +
                        "F " + free  + "[" + (free  - lastFree ) + "] \t" +
                        "T " + total + "[" + (total - lastTotal) + "] \t" +
                        step + "\n";

         try {
             resultsFile.write(stats);
         } catch (Exception ex) {
             ex.printStackTrace();
         }

         System.out.print(stats);

         lastTotal = total;
         lastFree  = free;
         lastUsed  = used;
     }

     /**
      * We can't rely on GC doing anything sensible
      * but I'm just playing here to see if I can
      * force it to GC
      */
     public void tryToGC(){

         Runtime runtime = Runtime.getRuntime();

 /*
         // force OOME
         StringBuffer sb = new StringBuffer();
         try {
             while(true)
             {
                 sb.append("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
             }
         } catch (OutOfMemoryError ex){
             // we are going to GC now
             System.out.println("OOME");
         }
         sb = null;


         for (int i = 0; i < 10; i++){
             Object obj = new Object();
             WeakReference ref = new WeakReference<Object>(obj);
             obj = null;
             while(ref.get() != null) {
                 runtime.runFinalization();
                 runtime.gc();
                 try {
                     Thread.sleep(100);
                 } catch (InterruptedException e) {
                     // Do nothing
                 }
             }
         }
 */
     }

     public void dumpHeap(String heapName){
         String vendor = System.getProperty("java.vendor");
         if (vendor.contains("Sun")){
             dumpHeapSun(heapName);
         }
     }


     public void dumpHeapSun(String heapName){
         final MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();
         final OperatingSystemMXBean osBean = ManagementFactory.getOperatingSystemMXBean();
         final MBeanServer platformBean = ManagementFactory.getPlatformMBeanServer();

         HotSpotDiagnosticMXBean bean = null;

         try {
             bean = ManagementFactory.newPlatformMXBeanProxy(platformBean,
                                                             "com.sun.management:type=HotSpotDiagnostic",
                                                             HotSpotDiagnosticMXBean.class);
             deleteFile(heapName);
             bean.dumpHeap(heapName, false);
         } catch(Exception ex){
             ex.printStackTrace();
         }
     }

     public void dumpHeapIBM(){

     }

     public void deleteFile(String filename){
         File theFile = new File(filename);
         theFile.delete();
     }

     public void waitForInput() {
         System.out.println("Press a key to end");
         try {
             System.in.read();
         } catch (Exception ex) {
         }
         System.out.println("Continuing");
     }

     // final MemoryMXBean mb = ManagementFactory.getMemoryMXBean();
     // com.sun.management.OperatingSystemMXBean if java.lang.management.OperationSystemMXBean
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing,
	* software distributed under the License is distributed on an
	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	* KIND, either express or implied. See the License for the
	* specific language governing permissions and limitations
	* under the License.
	*/
	package org.apache.tuscany.sca.test.performance;

	import static org.junit.Assert.assertEquals;
	import static org.junit.Assert.assertNotNull;
	import static org.junit.Assert.fail;

	import java.io.BufferedWriter;
	import java.io.File;
	import java.io.FileWriter;
	import java.lang.management.ManagementFactory;
	import java.lang.management.MemoryMXBean;
	import java.lang.management.OperatingSystemMXBean;
	import java.lang.ref.WeakReference;

	import javax.management.MBeanServer;

	import org.apache.tuscany.sca.Node;
	import org.apache.tuscany.sca.TuscanyRuntime;
	import org.apache.tuscany.sca.core.ExtensionPointRegistry;
	import org.apache.tuscany.sca.core.FactoryExtensionPoint;
	import org.apache.tuscany.sca.core.UtilityExtensionPoint;
	import org.apache.tuscany.sca.databinding.jaxb.JAXBContextHelper;
	import org.apache.tuscany.sca.impl.NodeImpl;
	import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
	import org.apache.tuscany.sca.interfacedef.java.impl.JavaInterfaceFactoryImpl;
	import org.apache.tuscany.sca.test.performance.client.BeanA;
	import org.apache.tuscany.sca.test.performance.client.Helloworld;
	import org.junit.AfterClass;
	import org.junit.Assert;
	import org.junit.BeforeClass;
	import org.junit.Test;

	import com.sun.management.HotSpotDiagnosticMXBean;

	/*
	* A test looking at memory and runtime performance.
	* TODO - only a couple of memory tests to start with
	*/
	public class PerformanceTestCase {

	public boolean writeHeapDump = true;

	private static BufferedWriter resultsFile = null;

	private TuscanyRuntime runtime;
	private Node node;
	private ExtensionPointRegistry extensionPointRegistry;
	private long lastTotal = 0;
	private long lastFree = 0;
	private long lastUsed = 0;

	@BeforeClass
	public static void setUp() throws Exception {
	FileWriter fileWriter = new FileWriter("out.txt");
	resultsFile = new BufferedWriter(fileWriter);
	}

	@AfterClass
	public static void tearDown() throws Exception {
	resultsFile.flush();
	resultsFile.close();
	}

	@Test
	public void testNodeStartStop() {
	dumpHeapStart("testInstallUninstall");

	printRuntimeStats("createRuntime");

	createRuntime();

	callNodeStartStopRepeatedly(100);

	waitForInput();

	dumpHeapEnd("testInstallUninstall_postNodeStop");

	printRuntimeStats("stopRuntime");

	stopRuntime();

	printRuntimeStats("destroyRuntime");

	destroyRuntime();

	printRuntimeStats("End");

	dumpHeapEnd("testInstallUninstall_postStop");
	}

	@Test
	public void testInstallUninstall() {
	dumpHeapStart("testInstallUninstall");

	printRuntimeStats("createRuntime");

	createRuntime();

	printRuntimeStats("createNode");

	createNode();

	callInstallUninstallRepeatedly(100);

	dumpHeapEnd("testInstallUninstall_postUninstall");

	checkCacheStatus();

	printRuntimeStats("stopNode");

	stopNode();

	printRuntimeStats("destroyNode");

	destroyNode();

	printRuntimeStats("stopRuntime");

	stopRuntime();

	printRuntimeStats("destroyRuntime");

	destroyRuntime();

	printRuntimeStats("End");

	dumpHeapEnd("testInstallUninstall_postStop");
	}


	@Test
	public void testCall() {
	dumpHeapStart("TestCall");

	printRuntimeStats("createRuntime");

	createRuntime();

	printRuntimeStats("createNode");

	createNode();

	printRuntimeStats("installContribution");

	installContribution();

	printRuntimeStats("startNode");

	startComposite();

	printRuntimeStats("callServiceRepeatedly 10000 times");

	callServiceRepeatedly(10000);

	printRuntimeStats("stopCompositeAndUninstallUnused");

	stopCompositeAndUninstallUnused();

	//printRuntimeStats("uninstallContribution");

	//uninstallContribution();
	dumpHeapEnd("TestCall_postUninstall");

	printRuntimeStats("stopNode");

	stopNode();

	printRuntimeStats("destroyNode");

	destroyNode();

	printRuntimeStats("stopRuntime");

	stopRuntime();

	printRuntimeStats("destroyRuntime");

	destroyRuntime();

	printRuntimeStats("End");

	dumpHeapEnd("TestCall_postStop");
	}

	public void checkCacheStatus(){
	UtilityExtensionPoint utilityExtensionPoint = extensionPointRegistry.getExtensionPoint(UtilityExtensionPoint.class);
	JAXBContextHelper jaxbContextHelper = utilityExtensionPoint.getUtility(JAXBContextHelper.class);

	Assert.assertEquals("JAXBContextCache > 1", 1, jaxbContextHelper.getJAXBContextCache().getCache().keySet().size());

	FactoryExtensionPoint factoryExtensionPoint = extensionPointRegistry.getExtensionPoint(FactoryExtensionPoint.class);
	JavaInterfaceFactory javaInterfaceFactory = factoryExtensionPoint.getFactory(JavaInterfaceFactory.class);
	Assert.assertEquals("JavaInterfaceFactoryImpl.normalCache > 1", 1, ((JavaInterfaceFactoryImpl)javaInterfaceFactory).getNormalCache().keySet().size());

	}

	// ============================================================

	public void callNodeStartStopRepeatedly(int repeatCount) {
	for (int i =0; i < repeatCount; i++){
	printRuntimeStats("createNode");

	createNode();

	callInstallUninstallRepeatedly(1);

	printRuntimeStats("stopNode");

	stopNode();

	printRuntimeStats("destroyNode");

	destroyNode();
	}
	}

	public void callInstallUninstallRepeatedly(int repeatCount) {
	for (int i =0; i < repeatCount; i++){
	printRuntimeStats("install/unistall contribution");

	installContribution();

	startComposite();

	callService();

	stopCompositeAndUninstallUnused();

	//uninstallContribution();
	}
	}

	public void callServiceRepeatedly(int repeatCount) {
	for (int i =0; i < repeatCount; i++){
	callService();
	}
	}

	// ============================================================

	public void dumpHeapStart(String name){
	if (writeHeapDump){
	dumpHeap("heap_start_" + name + ".bin");
	}
	}

	public void dumpHeapEnd(String name){
	if (writeHeapDump){
	dumpHeap("heap_stop_" + name + ".bin");

	System.out.println("You can watch a JVM run using \n" +
	" jconsole \n" +
	"You can manually dump the heap using \n" +
	" jmap -dump:file=heap_stop_" + name + ".bin 345" +
	"Where 345 is the process id from jconsole \n" +
	"The program dumps the heap at the start and end. You can look at them using \n" +
	" jhat -J-Xmx512m heap_start.bin\n" +
	" jhat -J-Xmx512m heap_stop_" + name + ".bin\n" +
	"Then point your browser at\n" +
	" http://localhost:7000/");
	} else {
	System.out.println("NO HEAP DUMPS WRITTEN");
	}
	}

	public void createRuntime() {
	runtime = TuscanyRuntime.newInstance();
	}

	public void createNode() {
	node = runtime.createNode("default");
	extensionPointRegistry = ((NodeImpl)node).getExtensionPointRegistry();
	}

	public void installContribution() {
	try {
	node.installContribution("performance", "../performance-contribution1/target/itest-performance-contribution1-2.5-SNAPSHOT.jar", null, null);
	} catch (Exception ex){
	ex.printStackTrace();
	}
	}

	public void startComposite() {
	try {
	node.startComposite("performance", "PerformanceTest.composite");
	} catch (Exception ex){
	ex.printStackTrace();
	}
	}

	public void stopCompositeAndUninstallUnused(){
	try {
	node.stopCompositeAndUninstallUnused("performance", "PerformanceTest.composite");
	} catch (Exception ex){
	ex.printStackTrace();
	}
	}

	public void uninstallContribution(){
	try {
	node.installContribution("performance");
	} catch (Exception ex){
	ex.printStackTrace();
	}
	}

	public void stopNode(){
	node.stop();
	}

	public void destroyNode() {
	node = null;
	}

	public void stopRuntime() {
	runtime.stop();
	}

	public void destroyRuntime() {
	runtime = null;
	}

	public void callService() {
	try {
	Helloworld helloWorldClient = node.getService(Helloworld.class, "HelloWorldClientComponent");

	assertNotNull(helloWorldClient);

	BeanA beanA = new BeanA();
	beanA.setField1("Smith");
	beanA.setField2(13);

	assertEquals("Hello Hello Jane Smith", helloWorldClient.sayHello("Jane", beanA));
	} catch (Exception ex) {
	fail(ex.toString());
	}
	}

	public void printRuntimeStats(String step){
	tryToGC();

	Runtime runtime = Runtime.getRuntime();

	long used = runtime.totalMemory() - runtime.freeMemory();
	long free = runtime.freeMemory();
	long total = runtime.totalMemory();

	String stats = "U " + used + "[" + (used - lastUsed ) + "] \t" +
	"F " + free + "[" + (free - lastFree ) + "] \t" +
	"T " + total + "[" + (total - lastTotal) + "] \t" +
	step + "\n";

	try {
	resultsFile.write(stats);
	} catch (Exception ex) {
	ex.printStackTrace();
	}

	System.out.print(stats);

	lastTotal = total;
	lastFree = free;
	lastUsed = used;
	}

	/**
	* We can't rely on GC doing anything sensible
	* but I'm just playing here to see if I can
	* force it to GC
	*/
	public void tryToGC(){

	Runtime runtime = Runtime.getRuntime();

	/*
	// force OOME
	StringBuffer sb = new StringBuffer();
	try {
	while(true)
	{
	sb.append("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
	}
	} catch (OutOfMemoryError ex){
	// we are going to GC now
	System.out.println("OOME");
	}
	sb = null;


	for (int i = 0; i < 10; i++){
	Object obj = new Object();
	WeakReference ref = new WeakReference<Object>(obj);
	obj = null;
	while(ref.get() != null) {
	runtime.runFinalization();
	runtime.gc();
	try {
	Thread.sleep(100);
	} catch (InterruptedException e) {
	// Do nothing
	}
	}
	}
	*/
	}

	public void dumpHeap(String heapName){
	String vendor = System.getProperty("java.vendor");
	if (vendor.contains("Sun")){
	dumpHeapSun(heapName);
	}
	}


	public void dumpHeapSun(String heapName){
	final MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();
	final OperatingSystemMXBean osBean = ManagementFactory.getOperatingSystemMXBean();
	final MBeanServer platformBean = ManagementFactory.getPlatformMBeanServer();

	HotSpotDiagnosticMXBean bean = null;

	try {
	bean = ManagementFactory.newPlatformMXBeanProxy(platformBean,
	"com.sun.management:type=HotSpotDiagnostic",
	HotSpotDiagnosticMXBean.class);
	deleteFile(heapName);
	bean.dumpHeap(heapName, false);
	} catch(Exception ex){
	ex.printStackTrace();
	}
	}

	public void dumpHeapIBM(){

	}

	public void deleteFile(String filename){
	File theFile = new File(filename);
	theFile.delete();
	}

	public void waitForInput() {
	System.out.println("Press a key to end");
	try {
	System.in.read();
	} catch (Exception ex) {
	}
	System.out.println("Continuing");
	}

	// final MemoryMXBean mb = ManagementFactory.getMemoryMXBean();
	// com.sun.management.OperatingSystemMXBean if java.lang.management.OperationSystemMXBean
	}