I'm experiencing performance slow down on JBoss 7.1.1 Final. I wrote simple program that demostrates this behavior. I generate an array of 100,000 of random integers and run bubble sort on it.

@Model
public class PerformanceTest {

          public void proceed() {
                    long now = System.currentTimeMillis();
                    int[] arr = new int[100000];
                    for(int i = 0; i < arr.length; i++) {
                              arr[i] = (int) (Math.random() * 200000);
                    }
                    long now2 = System.currentTimeMillis();
                    System.out.println((now2 - now) + "ms took to generate array");
                    now = System.currentTimeMillis();
                    bubbleSort(arr);
                    now2 = System.currentTimeMillis();
                    System.out.println((now2 - now) + "ms took to bubblesort array");
          }

          public void bubbleSort(int[] arr) {
                    boolean swapped = true;
                    int j = 0;
                    int tmp;
                    while (swapped) {
                              swapped = false;
                              j++;
                              for (int i = 0; i < arr.length - j; i++) {
                                        if (arr[i] > arr[i + 1]) {
                                                  tmp = arr[i];
                                                  arr[i] = arr[i + 1];
                                                  arr[i + 1] = tmp;
                                                  swapped = true;
                                        }
                              }
                    }
          }
}

Just after I start the server, it takes approximately 22 seconds to run this code. After few days of JBoss 7.1.1. running, it takes 330 sec to run this code. In both cases, I launch the code when the CPU utilization is very low (say, 1%). Any ideas why? I run the server with following arguments:

-Xms1280m -Xmx2048m -XX:MaxPermSize=2048m -Djava.net.preferIPv4Stack=true -Dorg.jboss.resolver.warning=true -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true -Duser.timezone=UTC -Djboss.server.default.config=standalone-full.xml -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n

I'm running it on Linux machine with java version "1.7.0_07".