23  */
  24 
  25 package gc.g1.humongousObjects;
  26 
  27 import jdk.test.lib.Asserts;
  28 import sun.hotspot.WhiteBox;
  29 
  30 /**
  31  * @test TestHumongousThreshold
  32  * @summary Checks that objects larger than half a region are allocated as humongous
  33  * @requires vm.gc=="G1" | vm.gc=="null"
  34  * @library /testlibrary /../../test/lib
  35  * @modules java.management
  36  * @build sun.hotspot.WhiteBox
  37  *        gc.g1.humongousObjects.Helpers
  38  *        gc.g1.humongousObjects.TestHumongousThreshold
  39  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  40  *                                sun.hotspot.WhiteBox$WhiteBoxPermission
  41  *
  42  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  43  * -XX:G1HeapRegionSize=1M
  44  * gc.g1.humongousObjects.TestHumongousThreshold
  45  *
  46  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  47  * -XX:G1HeapRegionSize=2M
  48  * gc.g1.humongousObjects.TestHumongousThreshold
  49  *
  50  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  51  * -XX:G1HeapRegionSize=4M
  52  * gc.g1.humongousObjects.TestHumongousThreshold
  53  *
  54  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  55  * -XX:G1HeapRegionSize=8M
  56  * gc.g1.humongousObjects.TestHumongousThreshold
  57  *
  58  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  59  * -XX:G1HeapRegionSize=16M
  60  * gc.g1.humongousObjects.TestHumongousThreshold
  61  *
  62  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  63  * -XX:G1HeapRegionSize=32M
  64  * gc.g1.humongousObjects.TestHumongousThreshold
  65  *
  66  */
  67 
  68 public class TestHumongousThreshold {
  69     private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
  70     private static final int REGION_SIZE = WHITE_BOX.g1RegionSize();
  71     private static final int MAX_CONTINUOUS_SIZE_CHECK = 129;
  72     private static final int NON_HUMONGOUS_DIVIDER = 10;
  73 
  74     /**
  75      * The method allocates byte[] with specified size and checks that:
  76      * 1. byte[] is allocated as we specified in expectedHumongous.
  77      * 2. byte[] is allocated as humongous if its size is large than a half of region and non-humongous otherwise.
  78      * It uses WB to obtain the size of created byte[]. Only objects larger than half of region are expected
  79      * to be humongous.
  80      *
  81      * @param arraySize size of allocation
  82      * @param expectedHumongous expected humongous/non-humongous allocation
  83      * @return allocated byte array

  23  */
  24 
  25 package gc.g1.humongousObjects;
  26 
  27 import jdk.test.lib.Asserts;
  28 import sun.hotspot.WhiteBox;
  29 
  30 /**
  31  * @test TestHumongousThreshold
  32  * @summary Checks that objects larger than half a region are allocated as humongous
  33  * @requires vm.gc=="G1" | vm.gc=="null"
  34  * @library /testlibrary /../../test/lib
  35  * @modules java.management
  36  * @build sun.hotspot.WhiteBox
  37  *        gc.g1.humongousObjects.Helpers
  38  *        gc.g1.humongousObjects.TestHumongousThreshold
  39  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  40  *                                sun.hotspot.WhiteBox$WhiteBoxPermission
  41  *
  42  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  43  * -XX:G1HeapRegionSize=1M -XX:+PrintGCDetails -XX:+PrintHeapAtGC
  44  * gc.g1.humongousObjects.TestHumongousThreshold
  45  *
  46  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  47  * -XX:G1HeapRegionSize=2M -XX:+PrintGCDetails -XX:+PrintHeapAtGC
  48  * gc.g1.humongousObjects.TestHumongousThreshold
  49  *
  50  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  51  * -XX:G1HeapRegionSize=4M -XX:+PrintGCDetails -XX:+PrintHeapAtGC
  52  * gc.g1.humongousObjects.TestHumongousThreshold
  53  *
  54  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  55  * -XX:G1HeapRegionSize=8M -XX:+PrintGCDetails -XX:+PrintHeapAtGC
  56  * gc.g1.humongousObjects.TestHumongousThreshold
  57  *
  58  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  59  * -XX:G1HeapRegionSize=16M -XX:+PrintGCDetails -XX:+PrintHeapAtGC
  60  * gc.g1.humongousObjects.TestHumongousThreshold
  61  *
  62  * @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
  63  * -XX:G1HeapRegionSize=32M -XX:+PrintGCDetails -XX:+PrintHeapAtGC
  64  * gc.g1.humongousObjects.TestHumongousThreshold
  65  *
  66  */
  67 
  68 public class TestHumongousThreshold {
  69     private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
  70     private static final int REGION_SIZE = WHITE_BOX.g1RegionSize();
  71     private static final int MAX_CONTINUOUS_SIZE_CHECK = 129;
  72     private static final int NON_HUMONGOUS_DIVIDER = 10;
  73 
  74     /**
  75      * The method allocates byte[] with specified size and checks that:
  76      * 1. byte[] is allocated as we specified in expectedHumongous.
  77      * 2. byte[] is allocated as humongous if its size is large than a half of region and non-humongous otherwise.
  78      * It uses WB to obtain the size of created byte[]. Only objects larger than half of region are expected
  79      * to be humongous.
  80      *
  81      * @param arraySize size of allocation
  82      * @param expectedHumongous expected humongous/non-humongous allocation
  83      * @return allocated byte array