41 import java.util.List;
42 import static jdk.test.lib.Asserts.*;
43
44 public class TestHumongousShrinkHeap {
45
46 public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
47 public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
48
49 private static final List<List<byte[]>> garbage = new ArrayList();
50 private static final int REGION_SIZE = 1024 * 1024; // 1M
51 private static final int LISTS_COUNT = 10;
52 private static final int HUMON_SIZE = Math.round(.9f * REGION_SIZE);
53 private static final long AVAILABLE_MEMORY
54 = Runtime.getRuntime().freeMemory();
55 private static final int HUMON_COUNT
56 = (int) ((AVAILABLE_MEMORY / HUMON_SIZE)
57 / LISTS_COUNT);
58
59
60 public static void main(String[] args) {
61 System.out.format("Running with %s max heap size. "
62 + "Will allocate humongous object of %s size %d times.%n",
63 MemoryUsagePrinter.humanReadableByteCount(AVAILABLE_MEMORY, false),
64 MemoryUsagePrinter.humanReadableByteCount(HUMON_SIZE, false),
65 HUMON_COUNT
66 );
67 new TestHumongousShrinkHeap().test();
68 }
69
70 private final void test() {
71 System.gc();
72 MemoryUsagePrinter.printMemoryUsage("init");
73
74 allocate();
75 MemoryUsagePrinter.printMemoryUsage("allocated");
76 MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
77
78 free();
79 MemoryUsagePrinter.printMemoryUsage("free");
80 MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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41 import java.util.List;
42 import static jdk.test.lib.Asserts.*;
43
44 public class TestHumongousShrinkHeap {
45
46 public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
47 public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
48
49 private static final List<List<byte[]>> garbage = new ArrayList();
50 private static final int REGION_SIZE = 1024 * 1024; // 1M
51 private static final int LISTS_COUNT = 10;
52 private static final int HUMON_SIZE = Math.round(.9f * REGION_SIZE);
53 private static final long AVAILABLE_MEMORY
54 = Runtime.getRuntime().freeMemory();
55 private static final int HUMON_COUNT
56 = (int) ((AVAILABLE_MEMORY / HUMON_SIZE)
57 / LISTS_COUNT);
58
59
60 public static void main(String[] args) {
61 if (HUMON_COUNT == 0) {
62 System.out.println("Skipped. Heap is too small");
63 return;
64 }
65 System.out.format("Running with %s max heap size. "
66 + "Will allocate humongous object of %s size %d times.%n",
67 MemoryUsagePrinter.humanReadableByteCount(AVAILABLE_MEMORY, false),
68 MemoryUsagePrinter.humanReadableByteCount(HUMON_SIZE, false),
69 HUMON_COUNT
70 );
71 new TestHumongousShrinkHeap().test();
72 }
73
74 private final void test() {
75 System.gc();
76 MemoryUsagePrinter.printMemoryUsage("init");
77
78 allocate();
79 MemoryUsagePrinter.printMemoryUsage("allocated");
80 MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
81
82 free();
83 MemoryUsagePrinter.printMemoryUsage("free");
84 MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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