25 
  26 import jdk.test.lib.Utils;
  27 
  28 import javax.management.InstanceNotFoundException;
  29 import javax.management.MBeanException;
  30 import javax.management.MBeanServer;
  31 import javax.management.MalformedObjectNameException;
  32 import javax.management.ObjectName;
  33 import javax.management.ReflectionException;
  34 import java.lang.management.ManagementFactory;
  35 import java.util.LinkedList;
  36 import java.util.List;
  37 import java.util.Random;
  38 
  39 
  40 /**
  41  * @test TestUnifiedLoggingSwitchStress
  42  * @key gc stress
  43  * @summary Switches gc log level on fly while stressing memory/gc
  44  * @requires !vm.flightRecorder

  45  * @library /test/lib /
  46  * @modules java.management java.base/jdk.internal.misc
  47  *
  48  * @run main/othervm -Xmx256M -Xms256M
  49  *                   gc.logging.TestUnifiedLoggingSwitchStress 60
  50  */
  51 
  52 class MemoryStresser implements Runnable {
  53     public static volatile boolean shouldStop = false;
  54 
  55     private final List<byte[]> liveObjects = new LinkedList<>();
  56     private final List<byte[]> liveHObjects = new LinkedList<>();
  57     private int maxSimpleAllocationMemory = 0;
  58     private int usedMemory = 0;
  59 
  60     /**
  61      * Maximum amount of huge allocations
  62      */
  63     private static int H_ALLOCATION_MAX_COUNT = 4;
  64     /**

  25 
  26 import jdk.test.lib.Utils;
  27 
  28 import javax.management.InstanceNotFoundException;
  29 import javax.management.MBeanException;
  30 import javax.management.MBeanServer;
  31 import javax.management.MalformedObjectNameException;
  32 import javax.management.ObjectName;
  33 import javax.management.ReflectionException;
  34 import java.lang.management.ManagementFactory;
  35 import java.util.LinkedList;
  36 import java.util.List;
  37 import java.util.Random;
  38 
  39 
  40 /**
  41  * @test TestUnifiedLoggingSwitchStress
  42  * @key gc stress
  43  * @summary Switches gc log level on fly while stressing memory/gc
  44  * @requires !vm.flightRecorder
  45  * @requires vm.gc != "Z"
  46  * @library /test/lib /
  47  * @modules java.management java.base/jdk.internal.misc
  48  *
  49  * @run main/othervm -Xmx256M -Xms256M
  50  *                   gc.logging.TestUnifiedLoggingSwitchStress 60
  51  */
  52 
  53 class MemoryStresser implements Runnable {
  54     public static volatile boolean shouldStop = false;
  55 
  56     private final List<byte[]> liveObjects = new LinkedList<>();
  57     private final List<byte[]> liveHObjects = new LinkedList<>();
  58     private int maxSimpleAllocationMemory = 0;
  59     private int usedMemory = 0;
  60 
  61     /**
  62      * Maximum amount of huge allocations
  63      */
  64     private static int H_ALLOCATION_MAX_COUNT = 4;
  65     /**