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comparison test/gc/g1/TestHumongousShrinkHeap.java @ 20461:9b8bd21b6823

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8056237: [TESTBUG] gc/g1/TestHumongousShrinkHeap.java fails due to OOM Summary: Added respect for available memory. Renamed function names Reviewed-by: jwilhelm, tschatzl Contributed-by: andrey.x.zakharov@oracle.com
author jwilhelm
date Thu, 11 Sep 2014 14:21:24 +0200
parents b1266b08b994
children 7a6313074325
comparison
equal deleted inserted replaced
20460:df66e3a3c4c2 20461:9b8bd21b6823
24 /** 24 /**
25 * @test TestHumongousShrinkHeap 25 * @test TestHumongousShrinkHeap
26 * @bug 8036025 8056043 26 * @bug 8036025 8056043
27 * @summary Verify that heap shrinks after GC in the presence of fragmentation due to humongous objects 27 * @summary Verify that heap shrinks after GC in the presence of fragmentation due to humongous objects
28 * @library /testlibrary 28 * @library /testlibrary
29 * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=50 -XX:+UseG1GC -XX:G1HeapRegionSize=1M -verbose:gc TestHumongousShrinkHeap 29 * @run main/othervm -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=12 -XX:+UseG1GC -XX:G1HeapRegionSize=1M -verbose:gc TestHumongousShrinkHeap
30 */ 30 */
31 31
32 import java.lang.management.ManagementFactory; 32 import java.lang.management.ManagementFactory;
33 import java.lang.management.MemoryUsage; 33 import java.lang.management.MemoryUsage;
34 import java.util.ArrayList; 34 import java.util.ArrayList;
39 public class TestHumongousShrinkHeap { 39 public class TestHumongousShrinkHeap {
40 40
41 public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio"; 41 public static final String MIN_FREE_RATIO_FLAG_NAME = "MinHeapFreeRatio";
42 public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio"; 42 public static final String MAX_FREE_RATIO_FLAG_NAME = "MaxHeapFreeRatio";
43 43
44 private static final ArrayList<ArrayList<byte[]>> garbage = new ArrayList<>(); 44 private static final List<List<byte[]>> garbage = new ArrayList();
45 private static final int PAGE_SIZE = 1024 * 1024; // 1M 45 private static final int REGION_SIZE = 1024 * 1024; // 1M
46 private static final int PAGES_NUM = 5; 46 private static final int LISTS_COUNT = 10;
47 private static final int HUMON_SIZE = Math.round(.9f * REGION_SIZE);
48 private static final long AVAILABLE_MEMORY
49 = Runtime.getRuntime().freeMemory();
50 private static final int HUMON_COUNT
51 = (int) ((AVAILABLE_MEMORY / HUMON_SIZE)
52 / LISTS_COUNT);
47 53
48 54
49 public static void main(String[] args) { 55 public static void main(String[] args) {
56 System.out.format("Running with %s max heap size. "
57 + "Will allocate humongous object of %s size %d times.%n",
58 MemoryUsagePrinter.humanReadableByteCount(AVAILABLE_MEMORY, false),
59 MemoryUsagePrinter.humanReadableByteCount(HUMON_SIZE, false),
60 HUMON_COUNT
61 );
50 new TestHumongousShrinkHeap().test(); 62 new TestHumongousShrinkHeap().test();
51 } 63 }
52 64
53 private final void test() { 65 private final void test() {
54 System.gc(); 66 System.gc();
55 MemoryUsagePrinter.printMemoryUsage("init"); 67 MemoryUsagePrinter.printMemoryUsage("init");
56 68
57 eat(); 69 allocate();
58 MemoryUsagePrinter.printMemoryUsage("eaten"); 70 MemoryUsagePrinter.printMemoryUsage("allocated");
59 MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); 71 MemoryUsage muFull = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
60 72
61 free(); 73 free();
62 MemoryUsagePrinter.printMemoryUsage("free"); 74 MemoryUsagePrinter.printMemoryUsage("free");
63 MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); 75 MemoryUsage muFree = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
70 MAX_FREE_RATIO_FLAG_NAME, 82 MAX_FREE_RATIO_FLAG_NAME,
71 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue() 83 ManagementFactoryHelper.getDiagnosticMXBean().getVMOption(MAX_FREE_RATIO_FLAG_NAME).getValue()
72 )); 84 ));
73 } 85 }
74 86
75 private void eat() { 87 private void allocate() {
76 int HumongousObjectSize = Math.round(.9f * PAGE_SIZE);
77 System.out.println("Will allocate objects of size=" +
78 MemoryUsagePrinter.humanReadableByteCount(HumongousObjectSize, true));
79 88
80 for (int i = 0; i < PAGES_NUM; i++) { 89 for (int i = 0; i < LISTS_COUNT; i++) {
81 ArrayList<byte[]> stuff = new ArrayList<>(); 90 List<byte[]> stuff = new ArrayList();
82 eatList(stuff, 100, HumongousObjectSize); 91 allocateList(stuff, HUMON_COUNT, HUMON_SIZE);
83 MemoryUsagePrinter.printMemoryUsage("eat #" + i); 92 MemoryUsagePrinter.printMemoryUsage("allocate #" + (i+1));
84 garbage.add(stuff); 93 garbage.add(stuff);
85 } 94 }
86 } 95 }
87 96
88 private void free() { 97 private void free() {
89 // do not free last one list 98 // do not free last one list
90 garbage.subList(0, garbage.size() - 1).clear(); 99 garbage.subList(0, garbage.size() - 1).clear();
91 100
92 // do not free last one element from last list 101 // do not free last one element from last list
93 ArrayList stuff = garbage.get(garbage.size() - 1); 102 List stuff = garbage.get(garbage.size() - 1);
94 stuff.subList(0, stuff.size() - 1).clear(); 103 stuff.subList(0, stuff.size() - 1).clear();
95 System.gc(); 104 System.gc();
96 } 105 }
97 106
98 private static void eatList(List garbage, int count, int size) { 107 private static void allocateList(List garbage, int count, int size) {
99 for (int i = 0; i < count; i++) { 108 for (int i = 0; i < count; i++) {
100 garbage.add(new byte[size]); 109 garbage.add(new byte[size]);
101 } 110 }
102 } 111 }
103 } 112 }
120 public static void printMemoryUsage(String label) { 129 public static void printMemoryUsage(String label) {
121 MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); 130 MemoryUsage memusage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
122 float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted(); 131 float freeratio = 1f - (float) memusage.getUsed() / memusage.getCommitted();
123 System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n", 132 System.out.format("[%-24s] init: %-7s, used: %-7s, comm: %-7s, freeRatio ~= %.1f%%%n",
124 label, 133 label,
125 humanReadableByteCount(memusage.getInit(), true), 134 humanReadableByteCount(memusage.getInit(), false),
126 humanReadableByteCount(memusage.getUsed(), true), 135 humanReadableByteCount(memusage.getUsed(), false),
127 humanReadableByteCount(memusage.getCommitted(), true), 136 humanReadableByteCount(memusage.getCommitted(), false),
128 freeratio * 100 137 freeratio * 100
129 ); 138 );
130 } 139 }
131 } 140 }