27 import jdk.test.lib.Utils;
  28 
  29 import javax.management.InstanceNotFoundException;
  30 import javax.management.MBeanException;
  31 import javax.management.MBeanServer;
  32 import javax.management.MalformedObjectNameException;
  33 import javax.management.ObjectName;
  34 import javax.management.ReflectionException;
  35 import java.lang.management.ManagementFactory;
  36 import java.util.LinkedList;
  37 import java.util.List;
  38 import java.util.Random;
  39 
  40 
  41 /**
  42  * @test TestUnifiedLoggingSwitchStress
  43  * @summary Switches gc log level on fly while stressing memory/gc
  44  * @key gc
  45  * @key stress
  46  * @requires !vm.flightRecorder
  47  * @library /testlibrary /test/lib /
  48  * @modules java.management java.base/jdk.internal.misc
  49  *
  50  * @run main/othervm -Xmx256M -Xms256M
  51  *                   gc.logging.TestUnifiedLoggingSwitchStress 60
  52  */
  53 
  54 class MemoryStresser implements Runnable {
  55     public static volatile boolean shouldStop = false;
  56 
  57     private final List<byte[]> liveObjects = new LinkedList<>();
  58     private final List<byte[]> liveHObjects = new LinkedList<>();
  59     private int maxSimpleAllocationMemory = 0;
  60     private int usedMemory = 0;
  61 
  62     /**
  63      * Maximum amount of huge allocations
  64      */
  65     private static int H_ALLOCATION_MAX_COUNT = 4;
  66     /**
  67      * Maximum regions in one huge allocation

  27 import jdk.test.lib.Utils;
  28 
  29 import javax.management.InstanceNotFoundException;
  30 import javax.management.MBeanException;
  31 import javax.management.MBeanServer;
  32 import javax.management.MalformedObjectNameException;
  33 import javax.management.ObjectName;
  34 import javax.management.ReflectionException;
  35 import java.lang.management.ManagementFactory;
  36 import java.util.LinkedList;
  37 import java.util.List;
  38 import java.util.Random;
  39 
  40 
  41 /**
  42  * @test TestUnifiedLoggingSwitchStress
  43  * @summary Switches gc log level on fly while stressing memory/gc
  44  * @key gc
  45  * @key stress
  46  * @requires !vm.flightRecorder
  47  * @library /test/lib /
  48  * @modules java.management java.base/jdk.internal.misc
  49  *
  50  * @run main/othervm -Xmx256M -Xms256M
  51  *                   gc.logging.TestUnifiedLoggingSwitchStress 60
  52  */
  53 
  54 class MemoryStresser implements Runnable {
  55     public static volatile boolean shouldStop = false;
  56 
  57     private final List<byte[]> liveObjects = new LinkedList<>();
  58     private final List<byte[]> liveHObjects = new LinkedList<>();
  59     private int maxSimpleAllocationMemory = 0;
  60     private int usedMemory = 0;
  61 
  62     /**
  63      * Maximum amount of huge allocations
  64      */
  65     private static int H_ALLOCATION_MAX_COUNT = 4;
  66     /**
  67      * Maximum regions in one huge allocation