Octavian Pop [https://community.jboss.org/people/PopOctavian] created the discussion "JBoss 6.1.0.Final SFSB concurrency issue" To view the discussion, visit: https://community.jboss.org/message/828891#828891 -------------------------------------------------------------- Hi, I am trying to run a test to investigate a performace issue after upgrading from JBoss 4.0.5 to 6.1. For this I use a simple test application with a service which starts threads, each thread looks-up a SFSB instace and execute a method to increment a number. If I commented out CMC, performance increased significantly. Is this a known behavior? What are the implications if I comment CMC? Thanks. Below are code snippets from test: @Service public class TestingService {       public static int numberOfThreads=2;       public static void start() throws Exception     {           startTest(numberOfThreads);     }       public static void startTest(int threadNumber) throws InterruptedException     {         Thread [] threads = new Thread[threadNumber];           for (int i=0;i< threadNumber;i++)         {             Thread t = new Thread()             {                 public void run()                 {                     Client testClient = new Client();                     testClient.processNumber(Math.round(Math.random()*1000));                     testClient.destroy();                 }             };             t.start();             threads[i] = t;         }           for(int i=0; i<threadNumber; i++)         {             threads[i].join();         }     } }   public class Client {     IGenericSFB genericSFB;       public Client()     {         genericSFB = (IGenericSFB) ServiceLocator.getLocalService(GenericSFB.class.getSimpleName());         System.out.println("This address " + genericSFB + " " + genericSFB.hashCode());     }         public void processNumber(Long number)     {         System.out.println("Client - Start incrementing " + number);         genericSFB.incrementNumber(number);         System.out.println("Client - Finish incrementing " + number);       } ...     @Stateful public class GenericSFB implements IGenericSFB, Serializable {     private int number;     private String stuff;     private String someOtherStuff;       public Long incrementNumber(Long number)     {         System.out.println("SFB - start incrementing number " + number + " by " + this);         try         {             Thread.currentThread().sleep(10000);         }         catch (InterruptedException e){}           System.out.println("SFB - finish incrementing number " + number);           return 0L;     } ...     -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/828891#828891] Start a new discussion in EJB3 at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]