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. >From this test I notticed that SFSB method calls in the multi-threaded test >are serialized - one execution after the other. Investigating in more detail I >found that this serialization is caused by CMC interceptor from >server/current/deploy/ejb3-interceptors-aop.xml. 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&containerType=14&container=2029]
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