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rednaxelafx/CLHSDB session

Created May 5, 2011 07:52
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Another demo on primitive type arrays and wrapper type arrays in a Java program running on HotSpot, using SA on a core dump. Env: JDK6u25, x64, -Xmx10m (-server and -XX:+UseCompressedOops are on by default)
Raw
CLHSDB session
$ java -version
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode)
$ alias -p | grep clhsdb
alias clhsdb='java -classpath .:$JAVA_HOME/lib/sa-jdi.jar sun.jvm.hotspot.CLHSDB'
$ clhsdb
hsdb> help
Available commands:
assert true | false
attach pid | exec core
class name
classes
detach
dis address [ length ]
dumpclass { address | name } [ directory ]
dumpcodecache
dumpheap [ file ]
echo [ true | false ]
examine [ address/count ] | [ address,address]
field [ type [ name fieldtype isStatic offset address ] ]
findpc address
flags [ flag ]
help [ command ]
history
inspect expression
jdis address
jhisto
jseval script
jsload file
jstack [-v]
livenmethods
mem address [ length ]
pmap
print expression
printas type expression
printstatics [ type ]
pstack [-v]
quit
reattach
revptrs address
scanoops start end [ type ]
search [ heap | perm | rawheap | codecache | threads ] value
source filename
symbol name
sysprops
thread { -a | id }
threads
tokenize ...
type [ type [ name super isOop isInteger isUnsigned size ] ]
universe
verbose true | false
versioncheck [ true | false ]
whatis address
where { -a | id }
hsdb> attach /home/sajia/jdk/6u25_x64/bin/java core.23346
Opening core file, please wait...
hsdb> universe
Heap Parameters:
ParallelScavengeHeap [ PSYoungGen [ eden = [0x00000000ffcb0000,0x00000000ffeb2240,0x00000000fff40000] , from = [0x00000000fffa0000,0x00000000fffa0000,0x0000000100000000] , to = [0x00000000fff40000,0x00000000fff40000,0x00000000fffa0000] ] PSOldGen [ [0x00000000ff600000,0x00000000ff600000,0x00000000ffcb0000] ] PSPermGen [ [0x00000000fa400000,0x00000000fa67d6d0,0x00000000fb8c0000] ] ] hsdb>
hsdb> scanoops 0x00000000ff600000 0x0000000100000000 java.lang.Integer
0x00000000ffcbbc00 java/lang/Integer
0x00000000ffcbbc98 java/lang/Integer
0x00000000ffcbbd00 java/lang/Integer
...
0x00000000ffda5b28 java/lang/Integer
0x00000000ffda5b38 java/lang/Integer
...
0x00000000ffea5018 java/lang/Integer
0x00000000ffea5028 java/lang/Integer
hsdb> inspect 0x00000000ffda5b28
instance of Oop for java/lang/Integer @ 0x00000000ffda5b28 @ 0x00000000ffda5b28 (size = 16)
_mark: 1
value: 431
hsdb> inspect 0x00000000ffda5b38
instance of Oop for java/lang/Integer @ 0x00000000ffda5b38 @ 0x00000000ffda5b38 (size = 16)
_mark: 1
value: 432
hsdb> examine 0x00000000ffda5b28/10
0x00000000ffda5b28: 0x0000000000000001 0x000001affa4a2688 0x0000000000000001
0x00000000ffda5b40: 0x000001b0fa4a2688 0x0000000000000001 0x000001b1fa4a2688
0x00000000ffda5b58: 0x0000000000000001 0x000001b2fa4a2688 0x0000000000000001
0x00000000ffda5b70: 0x000001b3fa4a2688
hsdb> revptrs 0x00000000ffda5b28
Computing reverse pointers...
Done.
ObjArray @ 0x00000000ffd65b18
hsdb> inspect 0x00000000ffd65b18
instance of ObjArray @ 0x00000000ffd65b18 @ 0x00000000ffd65b18 (size = 262160)
_mark: 1
0: Oop for java/lang/Integer @ 0x00000000ffce4ff8 Oop for java/lang/Integer @ 0x00000000ffce4ff8
1: Oop for java/lang/Integer @ 0x00000000ffce5008 Oop for java/lang/Integer @ 0x00000000ffce5008
2: Oop for java/lang/Integer @ 0x00000000ffce5018 Oop for java/lang/Integer @ 0x00000000ffce5018
...
65534: Oop for java/lang/Integer @ 0x00000000ffea5018 Oop for java/lang/Integer @ 0x00000000ffea5018
65535: Oop for java/lang/Integer @ 0x00000000ffea5028 Oop for java/lang/Integer @ 0x00000000ffea5028
hsdb> inspect 0x00000000ffce4ff8
instance of Oop for java/lang/Integer @ 0x00000000ffce4ff8 @ 0x00000000ffce4ff8 (size = 16)
_mark: 1
value: 256
hsdb> inspect 0x00000000ffce5008
instance of Oop for java/lang/Integer @ 0x00000000ffce5008 @ 0x00000000ffce5008 (size = 16)
_mark: 1
value: 257
hsdb> inspect 0x00000000ffea5028
instance of Oop for java/lang/Integer @ 0x00000000ffea5028 @ 0x00000000ffea5028 (size = 16)
_mark: 1
value: 65791
hsdb> examine 0x00000000ffd65b18/6
0x00000000ffd65b18: 0x0000000000000001 0x00010000fa67c368 0xffce5008ffce4ff8
0x00000000ffd65b30: 0xffce5028ffce5018 0xffce5048ffce5038 0xffce5068ffce5058
hsdb> inspect 0x00000000fa67c368
instance of ObjArrayKlass for InstanceKlass for java/lang/Integer @ 0x00000000fa67c368 @ 0x00000000fa67c368 (size = 584)
_mark: 1
_java_mirror: Oop for java/lang/Class @ 0x00000000fa67c5d0 Oop for java/lang/Class @ 0x00000000fa67c5d0
_super: ObjArrayKlass for InstanceKlass for java/lang/Number @ 0x00000000fa67c098 Oop @ 0x00000000fa67c098
_layout_helper: -2146431998
_name: #[Ljava/lang/Integer; @ 0x00000000fa49ef20 Oop @ 0x00000000fa49ef20
_access_flags: -2147483648
_subklass: null null
_next_sibling: null null
_alloc_count: 0
_dimension: 1
_higher_dimension: null null
_lower_dimension: null null
_vtable_len: 5
_alloc_size: 0
_component_mirror: Oop for java/lang/Class @ 0x00000000fa4a2958 Oop for java/lang/Class @ 0x00000000fa4a2958
_element_klass: InstanceKlass for java/lang/Integer @ 0x00000000fa4a2688 Oop @ 0x00000000fa4a2688
_bottom_klass: InstanceKlass for java/lang/Integer @ 0x00000000fa4a2688 Oop @ 0x00000000fa4a2688
hsdb> class java.lang.Integer
java/lang/Integer @0x00000000fa4a2688
hsdb> print 0x00000000fa4a2688
public final class java.lang.Integer [signature Ljava/lang/Number;Ljava/lang/Comparable<Ljava/lang/Integer;>;] @0x00000000fa4a2688
Super Class
public abstract class java.lang.Number @0x00000000fa497350
Interfaces
public abstract interface java.lang.Comparable [signature <T:Ljava/lang/Object;>Ljava/lang/Object;] @0x00000000fa40beb8
Fields
public static final int MIN_VALUE; (offset = 704)
public static final int MAX_VALUE; (offset = 708)
public static final java.lang.Class TYPE; [signature Ljava/lang/Class<Ljava/lang/Integer;>;] (offset = 672)
static final char[] digits; (offset = 676)
static final char[] DigitTens; (offset = 680)
static final char[] DigitOnes; (offset = 684)
static final int[] sizeTable; (offset = 688)
private static java.lang.String integerCacheHighPropValue; (offset = 692)
private final int value; (offset = 12)
public static final int SIZE; (offset = 712)
private static final long serialVersionUID; (offset = 696)
Methods
public void <init>(int) @0x00000000fa4a04a8;
public void <init>(java.lang.String) @0x00000000fa4a0598;
static void <clinit>() @0x00000000fa4a25e8;
public static int numberOfLeadingZeros(int) @0x00000000fa4a1688;
public static int numberOfTrailingZeros(int) @0x00000000fa4a17b8;
public static int bitCount(int) @0x00000000fa4a18c8;
public boolean equals(java.lang.Object) @0x00000000fa4a0d90;
public static java.lang.String toString(int, int) @0x00000000fa49f5e0;
public static java.lang.String toString(int) @0x00000000fa49faa8;
public java.lang.String toString() @0x00000000fa4a0bb8;
public int hashCode() @0x00000000fa4a0c98;
public static int reverseBytes(int) @0x00000000fa4a1d78;
public int compareTo(java.lang.Integer) @0x00000000fa4a1378;
public [bridge] [synthetic] int compareTo(java.lang.Object) @0x00000000fa4a1e58;
public byte byteValue() @0x00000000fa4a0678;
public short shortValue() @0x00000000fa4a0758;
public int intValue() @0x00000000fa4a0838;
public long longValue() @0x00000000fa4a0918;
public float floatValue() @0x00000000fa4a09f8;
public double doubleValue() @0x00000000fa4a0ad8;
public static java.lang.Integer valueOf(java.lang.String, int) @0x00000000fa4a00e0;
public static java.lang.Integer valueOf(java.lang.String) @0x00000000fa4a01c8;
public static java.lang.Integer valueOf(int) @0x00000000fa4a03c0;
public static java.lang.String toHexString(int) @0x00000000fa49f6c0;
public static java.lang.Integer decode(java.lang.String) @0x00000000fa4a1280;
static void getChars(int, int, char[]) @0x00000000fa49fc18;
static [synthetic] java.lang.String access$000() @0x00000000fa4a1f30;
static void getAndRemoveCacheProperties() @0x00000000fa4a02c8;
public static int reverse(int) @0x00000000fa4a1ba8;
public static int parseInt(java.lang.String, int) @0x00000000fa49ff18;
public static int parseInt(java.lang.String) @0x00000000fa49fff8;
public static java.lang.Integer getInteger(java.lang.String) @0x00000000fa4a0e70;
public static java.lang.Integer getInteger(java.lang.String, int) @0x00000000fa4a0f60;
public static java.lang.Integer getInteger(java.lang.String, java.lang.Integer) @0x00000000fa4a10a0;
public static int highestOneBit(int) @0x00000000fa4a1478;
public static int lowestOneBit(int) @0x00000000fa4a1558;
public static int rotateLeft(int, int) @0x00000000fa4a19a8;
public static int rotateRight(int, int) @0x00000000fa4a1a88;
public static int signum(int) @0x00000000fa4a1c88;
static int stringSize(int) @0x00000000fa49fd08;
public static java.lang.String toBinaryString(int) @0x00000000fa49f880;
public static java.lang.String toOctalString(int) @0x00000000fa49f7a0;
private static java.lang.String toUnsignedString(int, int) @0x00000000fa49f998;
Constant Pool
Constant Pool of [public final class java.lang.Integer [signature Ljava/lang/Number;Ljava/lang/Comparable<Ljava/lang/Integer;>;] @0x00000000fa4a2688] @0x00000000fa49e480
hsdb> print 0x00000000fa4a04a8
public void <init>(int) @0x00000000fa4a04a8
Holder Class
public final class java.lang.Integer [signature Ljava/lang/Number;Ljava/lang/Comparable<Ljava/lang/Integer;>;] @0x00000000fa4a2688
Compiled Code
Disassembly for compiled method [public void <init>(int) @0x00000000fa4a04a8 ] @0x00002aaaab0831d0
Bytecode
line bci bytecode
642 0 aload_0 [fast_aload_0]
642 1 invokespecial #252 [Method void <init>()] of public abstract class java.lang.Number @0x00000000fa497350
643 4 aload_0 [fast_aload_0]
643 5 iload_1
643 6 putfield #229 [Field int value] [fast_iputfield] of public final class java.lang.Integer [signature Ljava/lang/Number;Ljava/lang/Comparable<Ljava/lang/Integer;>;] @0x00000000fa4a2688
644 9 return
Constant Pool
Constant Pool of [public final class java.lang.Integer [signature Ljava/lang/Number;Ljava/lang/Comparable<Ljava/lang/Integer;>;] @0x00000000fa4a2688] @0x00000000fa49e480
hsdb> inspect 0x00000000fa49e480
instance of ConstantPool for java/lang/Integer @ 0x00000000fa49e480 @ 0x00000000fa49e480 (size = 2256)
_mark: 1
_tags: [B @ 0x00000000fa49ed50 Oop for [B @ 0x00000000fa49ed50
_cache: ConstantPoolCache for java/lang/Integer @ 0x00000000fa56eae0 Oop @ 0x00000000fa56eae0
_pool_holder: InstanceKlass for java/lang/Integer @ 0x00000000fa4a2688 Oop @ 0x00000000fa4a2688
JVM_CONSTANT_Integer: -2147483648
JVM_CONSTANT_Integer: -2147483647
JVM_CONSTANT_Integer: 52429
JVM_CONSTANT_Integer: 65280
JVM_CONSTANT_Integer: 65536
JVM_CONSTANT_Integer: 99999
JVM_CONSTANT_Integer: 999999
JVM_CONSTANT_Integer: 9999999
JVM_CONSTANT_Integer: 16711680
JVM_CONSTANT_Integer: 99999999
JVM_CONSTANT_Integer: 252645135
JVM_CONSTANT_Integer: 858993459
JVM_CONSTANT_Integer: 999999999
JVM_CONSTANT_Integer: 1431655765
JVM_CONSTANT_Integer: 2147483647
JVM_CONSTANT_Utf8: # greater than Character.MAX_RADIX @ 0x00000000fa49ee78 Oop @ 0x00000000fa49ee78
JVM_CONSTANT_Utf8: # less than Character.MIN_RADIX @ 0x00000000fa49eeb0 Oop @ 0x00000000fa49eeb0
JVM_CONSTANT_Utf8: ## @ 0x00000000fa44ec68 Oop @ 0x00000000fa44ec68
JVM_CONSTANT_Utf8: #()B @ 0x00000000fa405dc8 Oop @ 0x00000000fa405dc8
JVM_CONSTANT_Utf8: #()D @ 0x00000000fa405e58 Oop @ 0x00000000fa405e58
JVM_CONSTANT_Utf8: #()F @ 0x00000000fa405e40 Oop @ 0x00000000fa405e40
JVM_CONSTANT_Utf8: #()I @ 0x00000000fa405e10 Oop @ 0x00000000fa405e10
JVM_CONSTANT_Utf8: #()J @ 0x00000000fa405e28 Oop @ 0x00000000fa405e28
JVM_CONSTANT_Utf8: #()Ljava/lang/String; @ 0x00000000fa406630 Oop @ 0x00000000fa406630
JVM_CONSTANT_Utf8: #()S @ 0x00000000fa405df8 Oop @ 0x00000000fa405df8
JVM_CONSTANT_Utf8: #()V @ 0x00000000fa405d98 Oop @ 0x00000000fa405d98
JVM_CONSTANT_Utf8: #()Z @ 0x00000000fa405db0 Oop @ 0x00000000fa405db0
JVM_CONSTANT_Utf8: #(CI)I @ 0x00000000fa48c8f0 Oop @ 0x00000000fa48c8f0
JVM_CONSTANT_Utf8: #(I)C @ 0x00000000fa40a0b0 Oop @ 0x00000000fa40a0b0
JVM_CONSTANT_Utf8: #(I)I @ 0x00000000fa405e88 Oop @ 0x00000000fa405e88
JVM_CONSTANT_Utf8: #(I)Ljava/lang/String; @ 0x00000000fa406b00 Oop @ 0x00000000fa406b00
JVM_CONSTANT_Utf8: #(I)V @ 0x00000000fa405e70 Oop @ 0x00000000fa405e70
JVM_CONSTANT_Utf8: #(II)I @ 0x00000000fa406b40 Oop @ 0x00000000fa406b40
JVM_CONSTANT_Utf8: #(II)Ljava/lang/String; @ 0x00000000fa40a0e0 Oop @ 0x00000000fa40a0e0
JVM_CONSTANT_Utf8: #(II[C)V @ 0x00000000fa40a128 Oop @ 0x00000000fa40a128
JVM_CONSTANT_Utf8: #(Ljava/lang/Object;)Z @ 0x00000000fa4060b8 Oop @ 0x00000000fa4060b8
JVM_CONSTANT_Utf8: #(Ljava/lang/String;)I @ 0x00000000fa406108 Oop @ 0x00000000fa406108
JVM_CONSTANT_Utf8: #(Ljava/lang/String;)Ljava/lang/Class; @ 0x00000000fa406400 Oop @ 0x00000000fa406400
JVM_CONSTANT_Utf8: #(Ljava/lang/String;)Ljava/lang/String; @ 0x00000000fa4064d8 Oop @ 0x00000000fa4064d8
JVM_CONSTANT_Utf8: #(Ljava/lang/String;)V @ 0x00000000fa4060e0 Oop @ 0x00000000fa4060e0
JVM_CONSTANT_Utf8: #(Ljava/lang/String;)Z @ 0x00000000fa406130 Oop @ 0x00000000fa406130
JVM_CONSTANT_Utf8: #([CII)V @ 0x00000000fa40a2b8 Oop @ 0x00000000fa40a2b8
JVM_CONSTANT_Utf8: #- @ 0x00000000fa498268 Oop @ 0x00000000fa498268
JVM_CONSTANT_Utf8: #-2147483648 @ 0x00000000fa478a30 Oop @ 0x00000000fa478a30
JVM_CONSTANT_Utf8: #0 @ 0x00000000fa498280 Oop @ 0x00000000fa498280
JVM_CONSTANT_Utf8: #0X @ 0x00000000fa49a8c0 Oop @ 0x00000000fa49a8c0
JVM_CONSTANT_Utf8: #0x @ 0x00000000fa4982e8 Oop @ 0x00000000fa4982e8
JVM_CONSTANT_Utf8: #<clinit> @ 0x00000000fa4041c0 Oop @ 0x00000000fa4041c0
JVM_CONSTANT_Utf8: #<init> @ 0x00000000fa4041a8 Oop @ 0x00000000fa4041a8
JVM_CONSTANT_Utf8: #Code @ 0x00000000fa4029f8 Oop @ 0x00000000fa4029f8
JVM_CONSTANT_Utf8: #ConstantValue @ 0x00000000fa4029d8 Oop @ 0x00000000fa4029d8
JVM_CONSTANT_Utf8: #DigitOnes @ 0x00000000fa49eee0 Oop @ 0x00000000fa49eee0
JVM_CONSTANT_Utf8: #DigitTens @ 0x00000000fa49ef00 Oop @ 0x00000000fa49ef00
JVM_CONSTANT_Utf8: #Exceptions @ 0x00000000fa402a10 Oop @ 0x00000000fa402a10
JVM_CONSTANT_Utf8: #I @ 0x00000000fa405ff0 Oop @ 0x00000000fa405ff0
JVM_CONSTANT_Utf8: #InnerClasses @ 0x00000000fa4029b8 Oop @ 0x00000000fa4029b8
JVM_CONSTANT_Utf8: #J @ 0x00000000fa406008 Oop @ 0x00000000fa406008
JVM_CONSTANT_Utf8: #LineNumberTable @ 0x00000000fa402a30 Oop @ 0x00000000fa402a30
JVM_CONSTANT_Utf8: #Ljava/lang/Class; @ 0x00000000fa406900 Oop @ 0x00000000fa406900
JVM_CONSTANT_Utf8: #Ljava/lang/String; @ 0x00000000fa406928 Oop @ 0x00000000fa406928
JVM_CONSTANT_Utf8: #MAX_VALUE @ 0x00000000fa48d080 Oop @ 0x00000000fa48d080
JVM_CONSTANT_Utf8: #MIN_VALUE @ 0x00000000fa48d180 Oop @ 0x00000000fa48d180
JVM_CONSTANT_Utf8: #Negative sign in wrong position @ 0x00000000fa49a8d8 Oop @ 0x00000000fa49a8d8
JVM_CONSTANT_Utf8: #SIZE @ 0x00000000fa48d2e8 Oop @ 0x00000000fa48d2e8
JVM_CONSTANT_Utf8: #Signature @ 0x00000000fa402b30 Oop @ 0x00000000fa402b30
JVM_CONSTANT_Utf8: #SourceFile @ 0x00000000fa402998 Oop @ 0x00000000fa402998
JVM_CONSTANT_Utf8: #TYPE @ 0x00000000fa471b58 Oop @ 0x00000000fa471b58
JVM_CONSTANT_Utf8: #[C @ 0x00000000fa4006f8 Oop @ 0x00000000fa4006f8
JVM_CONSTANT_Utf8: #[I @ 0x00000000fa4012d8 Oop @ 0x00000000fa4012d8
JVM_CONSTANT_Utf8: #[Ljava/lang/Integer; @ 0x00000000fa49ef20 Oop @ 0x00000000fa49ef20
JVM_CONSTANT_Utf8: #access$000 @ 0x00000000fa424840 Oop @ 0x00000000fa424840
JVM_CONSTANT_Utf8: #append @ 0x00000000fa404d38 Oop @ 0x00000000fa404d38
JVM_CONSTANT_Utf8: #bitCount @ 0x00000000fa404ad0 Oop @ 0x00000000fa404ad0
JVM_CONSTANT_Utf8: #byteValue @ 0x00000000fa405b50 Oop @ 0x00000000fa405b50
JVM_CONSTANT_Utf8: #cache @ 0x00000000fa4049d0 Oop @ 0x00000000fa4049d0
JVM_CONSTANT_Utf8: #charAt @ 0x00000000fa40a3e8 Oop @ 0x00000000fa40a3e8
JVM_CONSTANT_Utf8: #compareTo @ 0x00000000fa405288 Oop @ 0x00000000fa405288
JVM_CONSTANT_Utf8: #decode @ 0x00000000fa40a658 Oop @ 0x00000000fa40a658
JVM_CONSTANT_Utf8: #digit @ 0x00000000fa48d3e0 Oop @ 0x00000000fa48d3e0
JVM_CONSTANT_Utf8: #digits @ 0x00000000fa49ef48 Oop @ 0x00000000fa49ef48
JVM_CONSTANT_Utf8: #doubleValue @ 0x00000000fa405c10 Oop @ 0x00000000fa405c10
JVM_CONSTANT_Utf8: #equals @ 0x00000000fa404b10 Oop @ 0x00000000fa404b10
JVM_CONSTANT_Utf8: #floatValue @ 0x00000000fa405bf0 Oop @ 0x00000000fa405bf0
JVM_CONSTANT_Utf8: #forInputString @ 0x00000000fa49ef60 Oop @ 0x00000000fa49ef60
JVM_CONSTANT_Utf8: #getAndRemoveCacheProperties @ 0x00000000fa42d148 Oop @ 0x00000000fa42d148
JVM_CONSTANT_Utf8: #getChars @ 0x00000000fa40a738 Oop @ 0x00000000fa40a738
JVM_CONSTANT_Utf8: #getInteger @ 0x00000000fa49ef80 Oop @ 0x00000000fa49ef80
JVM_CONSTANT_Utf8: #getPrimitiveClass @ 0x00000000fa415f50 Oop @ 0x00000000fa415f50
JVM_CONSTANT_Utf8: #getProperties @ 0x00000000fa42d1a0 Oop @ 0x00000000fa42d1a0
JVM_CONSTANT_Utf8: #getProperty @ 0x00000000fa404740 Oop @ 0x00000000fa404740
JVM_CONSTANT_Utf8: #hashCode @ 0x00000000fa404d70 Oop @ 0x00000000fa404d70
JVM_CONSTANT_Utf8: #high @ 0x00000000fa49efa0 Oop @ 0x00000000fa49efa0
JVM_CONSTANT_Utf8: #highestOneBit @ 0x00000000fa49efb8 Oop @ 0x00000000fa49efb8
JVM_CONSTANT_Utf8: #int @ 0x00000000fa46b320 Oop @ 0x00000000fa46b320
JVM_CONSTANT_Utf8: #intValue @ 0x00000000fa405bb0 Oop @ 0x00000000fa405bb0
JVM_CONSTANT_Utf8: #integerCacheHighPropValue @ 0x00000000fa49efd8 Oop @ 0x00000000fa49efd8
JVM_CONSTANT_Utf8: #isBooted @ 0x00000000fa49f008 Oop @ 0x00000000fa49f008
JVM_CONSTANT_Utf8: #java.lang.Integer.IntegerCache.high @ 0x00000000fa49f028 Oop @ 0x00000000fa49f028
JVM_CONSTANT_Utf8: #java/lang/Character @ 0x00000000fa402148 Oop @ 0x00000000fa402148
JVM_CONSTANT_Utf8: #java/lang/Class @ 0x00000000fa401f48 Oop @ 0x00000000fa401f48
JVM_CONSTANT_Utf8: #java/lang/Comparable @ 0x00000000fa40a8a8 Oop @ 0x00000000fa40a8a8
JVM_CONSTANT_Utf8: #java/lang/IllegalArgumentException @ 0x00000000fa402e10 Oop @ 0x00000000fa402e10
JVM_CONSTANT_Utf8: #java/lang/Integer @ 0x00000000fa4022a0 Oop @ 0x00000000fa4022a0
JVM_CONSTANT_Utf8: #java/lang/Integer$IntegerCache @ 0x00000000fa4022c8 Oop @ 0x00000000fa4022c8
JVM_CONSTANT_Utf8: #java/lang/NullPointerException @ 0x00000000fa403088 Oop @ 0x00000000fa403088
JVM_CONSTANT_Utf8: #java/lang/Number @ 0x00000000fa494e00 Oop @ 0x00000000fa494e00
JVM_CONSTANT_Utf8: #java/lang/NumberFormatException @ 0x00000000fa494e28 Oop @ 0x00000000fa494e28
JVM_CONSTANT_Utf8: #java/lang/String @ 0x00000000fa401f70 Oop @ 0x00000000fa401f70
JVM_CONSTANT_Utf8: #java/lang/StringBuilder @ 0x00000000fa4025b0 Oop @ 0x00000000fa4025b0
JVM_CONSTANT_Utf8: #java/lang/System @ 0x00000000fa401ef8 Oop @ 0x00000000fa401ef8
JVM_CONSTANT_Utf8: #java/util/Properties @ 0x00000000fa402790 Oop @ 0x00000000fa402790
JVM_CONSTANT_Utf8: #length @ 0x00000000fa40aa90 Oop @ 0x00000000fa40aa90
JVM_CONSTANT_Utf8: #longValue @ 0x00000000fa405bd0 Oop @ 0x00000000fa405bd0
JVM_CONSTANT_Utf8: #lowestOneBit @ 0x00000000fa49f060 Oop @ 0x00000000fa49f060
JVM_CONSTANT_Utf8: #null @ 0x00000000fa40ab00 Oop @ 0x00000000fa40ab00
JVM_CONSTANT_Utf8: #numberOfLeadingZeros @ 0x00000000fa404a80 Oop @ 0x00000000fa404a80
JVM_CONSTANT_Utf8: #numberOfTrailingZeros @ 0x00000000fa404aa8 Oop @ 0x00000000fa404aa8
JVM_CONSTANT_Utf8: #parseInt @ 0x00000000fa49a988 Oop @ 0x00000000fa49a988
JVM_CONSTANT_Utf8: #radix @ 0x00000000fa49f080 Oop @ 0x00000000fa49f080
JVM_CONSTANT_Utf8: #remove @ 0x00000000fa42d698 Oop @ 0x00000000fa42d698
JVM_CONSTANT_Utf8: #reverse @ 0x00000000fa471cf8 Oop @ 0x00000000fa471cf8
JVM_CONSTANT_Utf8: #reverseBytes @ 0x00000000fa404fc8 Oop @ 0x00000000fa404fc8
JVM_CONSTANT_Utf8: #rotateLeft @ 0x00000000fa49f098 Oop @ 0x00000000fa49f098
JVM_CONSTANT_Utf8: #rotateRight @ 0x00000000fa49f0b8 Oop @ 0x00000000fa49f0b8
JVM_CONSTANT_Utf8: #serialVersionUID @ 0x00000000fa40ac50 Oop @ 0x00000000fa40ac50
JVM_CONSTANT_Utf8: #setProperties @ 0x00000000fa42d7d8 Oop @ 0x00000000fa42d7d8
JVM_CONSTANT_Utf8: #shortValue @ 0x00000000fa405b90 Oop @ 0x00000000fa405b90
JVM_CONSTANT_Utf8: #signum @ 0x00000000fa49f0d8 Oop @ 0x00000000fa49f0d8
JVM_CONSTANT_Utf8: #sizeTable @ 0x00000000fa478b70 Oop @ 0x00000000fa478b70
JVM_CONSTANT_Utf8: #startsWith @ 0x00000000fa40ac90 Oop @ 0x00000000fa40ac90
JVM_CONSTANT_Utf8: #stringSize @ 0x00000000fa49f0f0 Oop @ 0x00000000fa49f0f0
JVM_CONSTANT_Utf8: #substring @ 0x00000000fa40acd0 Oop @ 0x00000000fa40acd0
JVM_CONSTANT_Utf8: #sun/misc/VM @ 0x00000000fa425868 Oop @ 0x00000000fa425868
JVM_CONSTANT_Utf8: #toBinaryString @ 0x00000000fa49f110 Oop @ 0x00000000fa49f110
JVM_CONSTANT_Utf8: #toHexString @ 0x00000000fa4080d8 Oop @ 0x00000000fa4080d8
JVM_CONSTANT_Utf8: #toOctalString @ 0x00000000fa49f130 Oop @ 0x00000000fa49f130
JVM_CONSTANT_Utf8: #toString @ 0x00000000fa404b40 Oop @ 0x00000000fa404b40
JVM_CONSTANT_Utf8: #toUnsignedString @ 0x00000000fa49f150 Oop @ 0x00000000fa49f150
JVM_CONSTANT_Utf8: #value @ 0x00000000fa4049e8 Oop @ 0x00000000fa4049e8
JVM_CONSTANT_Utf8: #valueOf @ 0x00000000fa405c30 Oop @ 0x00000000fa405c30
JVM_CONSTANT_Integer: 32
JVM_CONSTANT_Long: 1360826667806852920
JVM_CONSTANT_UnresolvedClass: #java/lang/Character @ 0x00000000fa402148 Oop @ 0x00000000fa402148
JVM_CONSTANT_Class: InstanceKlass for java/lang/Class @ 0x00000000fa421298 Oop @ 0x00000000fa421298
JVM_CONSTANT_UnresolvedClass: #java/lang/Comparable @ 0x00000000fa40a8a8 Oop @ 0x00000000fa40a8a8
JVM_CONSTANT_UnresolvedClass: #java/lang/IllegalArgumentException @ 0x00000000fa402e10 Oop @ 0x00000000fa402e10
JVM_CONSTANT_Class: InstanceKlass for java/lang/Integer @ 0x00000000fa4a2688 Oop @ 0x00000000fa4a2688
JVM_CONSTANT_Class: InstanceKlass for java/lang/Integer$IntegerCache @ 0x00000000fa67cad0 Oop @ 0x00000000fa67cad0
JVM_CONSTANT_UnresolvedClass: #java/lang/NullPointerException @ 0x00000000fa403088 Oop @ 0x00000000fa403088
JVM_CONSTANT_Class: InstanceKlass for java/lang/Number @ 0x00000000fa497350 Oop @ 0x00000000fa497350
JVM_CONSTANT_UnresolvedClass: #java/lang/NumberFormatException @ 0x00000000fa494e28 Oop @ 0x00000000fa494e28
JVM_CONSTANT_UnresolvedClass: #java/lang/String @ 0x00000000fa401f70 Oop @ 0x00000000fa401f70
JVM_CONSTANT_UnresolvedClass: #java/lang/StringBuilder @ 0x00000000fa4025b0 Oop @ 0x00000000fa4025b0
JVM_CONSTANT_Class: InstanceKlass for java/lang/System @ 0x00000000fa430668 Oop @ 0x00000000fa430668
JVM_CONSTANT_Class: InstanceKlass for java/util/Properties @ 0x00000000fa457c60 Oop @ 0x00000000fa457c60
JVM_CONSTANT_Class: InstanceKlass for sun/misc/VM @ 0x00000000fa53d3c0 Oop @ 0x00000000fa53d3c0
JVM_CONSTANT_Utf8: #Ljava/lang/Class<Ljava/lang/Integer;>; @ 0x00000000fa49f178 Oop @ 0x00000000fa49f178
JVM_CONSTANT_Utf8: #Ljava/lang/Number;Ljava/lang/Comparable<Ljava/lang/Integer;>; @ 0x00000000fa49f1b0 Oop @ 0x00000000fa49f1b0
JVM_CONSTANT_Utf8: #(I)Ljava/lang/Integer; @ 0x00000000fa405cf8 Oop @ 0x00000000fa405cf8
JVM_CONSTANT_Utf8: #(Ljava/lang/Integer;)I @ 0x00000000fa49f200 Oop @ 0x00000000fa49f200
JVM_CONSTANT_Utf8: #(Ljava/lang/Object;)I @ 0x00000000fa406090 Oop @ 0x00000000fa406090
JVM_CONSTANT_Utf8: #(Ljava/lang/String;I)I @ 0x00000000fa40b0f8 Oop @ 0x00000000fa40b0f8
JVM_CONSTANT_Utf8: #(Ljava/lang/String;I)Z @ 0x00000000fa40b120 Oop @ 0x00000000fa40b120
JVM_CONSTANT_Utf8: #(I)Ljava/lang/StringBuilder; @ 0x00000000fa406a00 Oop @ 0x00000000fa406a00
JVM_CONSTANT_Utf8: #()Ljava/util/Properties; @ 0x00000000fa42dc20 Oop @ 0x00000000fa42dc20
JVM_CONSTANT_Utf8: #(Ljava/util/Properties;)V @ 0x00000000fa42dc50 Oop @ 0x00000000fa42dc50
JVM_CONSTANT_Utf8: #(Ljava/lang/String;)Ljava/lang/Integer; @ 0x00000000fa49f228 Oop @ 0x00000000fa49f228
JVM_CONSTANT_Utf8: #(Ljava/lang/String;I)Ljava/lang/Integer; @ 0x00000000fa49f268 Oop @ 0x00000000fa49f268
JVM_CONSTANT_Utf8: #(Ljava/lang/String;)Ljava/lang/NumberFormatException; @ 0x00000000fa49f2a8 Oop @ 0x00000000fa49f2a8
JVM_CONSTANT_Utf8: #(Ljava/lang/Object;)Ljava/lang/Object; @ 0x00000000fa417e38 Oop @ 0x00000000fa417e38
JVM_CONSTANT_Utf8: #(Ljava/lang/String;)Ljava/lang/StringBuilder; @ 0x00000000fa4069c0 Oop @ 0x00000000fa4069c0
JVM_CONSTANT_Utf8: #(Ljava/lang/String;Ljava/lang/Integer;)Ljava/lang/Integer; @ 0x00000000fa49f2f0 Oop @ 0x00000000fa49f2f0
JVM_CONSTANT_NameAndType: 4456553
JVM_CONSTANT_NameAndType: 4456600
JVM_CONSTANT_NameAndType: 5308481
JVM_CONSTANT_NameAndType: 5308482
JVM_CONSTANT_NameAndType: 5308509
JVM_CONSTANT_NameAndType: 5374094
JVM_CONSTANT_NameAndType: 4718672
JVM_CONSTANT_NameAndType: 5439576
JVM_CONSTANT_NameAndType: 4784237
JVM_CONSTANT_NameAndType: 2293868
JVM_CONSTANT_NameAndType: 2293885
JVM_CONSTANT_NameAndType: 2555966
JVM_CONSTANT_NameAndType: 2621550
JVM_CONSTANT_NameAndType: 2687068
JVM_CONSTANT_NameAndType: 2752601
JVM_CONSTANT_NameAndType: 2818192
JVM_CONSTANT_NameAndType: 2949182
JVM_CONSTANT_NameAndType: 3145790
JVM_CONSTANT_NameAndType: 3145827
JVM_CONSTANT_NameAndType: 3604542
JVM_CONSTANT_NameAndType: 11337881
JVM_CONSTANT_NameAndType: 11403354
JVM_CONSTANT_NameAndType: 2424982
JVM_CONSTANT_NameAndType: 2883729
JVM_CONSTANT_NameAndType: 2883734
JVM_CONSTANT_NameAndType: 2883737
JVM_CONSTANT_NameAndType: 3080343
JVM_CONSTANT_NameAndType: 3473470
JVM_CONSTANT_NameAndType: 3539087
JVM_CONSTANT_NameAndType: 11534467
JVM_CONSTANT_NameAndType: 11600015
JVM_CONSTANT_NameAndType: 11665493
JVM_CONSTANT_NameAndType: 11731046
JVM_CONSTANT_NameAndType: 11796619
JVM_CONSTANT_NameAndType: 3342437
JVM_CONSTANT_NameAndType: 11862107
JVM_CONSTANT_NameAndType: 11927705
JVM_CONSTANT_NameAndType: 11993185
JVM_CONSTANT_NameAndType: 12058757
JVM_CONSTANT_NameAndType: 3407975
JVM_CONSTANT_NameAndType: 12124245
JVM_CONSTANT_NameAndType: 12189796
JVM_CONSTANT_Fieldref: 12320929
JVM_CONSTANT_Fieldref: 12386465
JVM_CONSTANT_Fieldref: 12452001
JVM_CONSTANT_Fieldref: 12517537
JVM_CONSTANT_Fieldref: 12583073
JVM_CONSTANT_Fieldref: 12648609
JVM_CONSTANT_Fieldref: 12779681
JVM_CONSTANT_Fieldref: 12255394
JVM_CONSTANT_Fieldref: 12714146
JVM_CONSTANT_Methodref: 13107357
JVM_CONSTANT_Methodref: 14483614
JVM_CONSTANT_Methodref: 12845217
JVM_CONSTANT_Methodref: 13238433
JVM_CONSTANT_Methodref: 13303969
JVM_CONSTANT_Methodref: 13435041
JVM_CONSTANT_Methodref: 13566113
JVM_CONSTANT_Methodref: 13631649
JVM_CONSTANT_Methodref: 13828257
JVM_CONSTANT_Methodref: 13959329
JVM_CONSTANT_Methodref: 14155937
JVM_CONSTANT_Methodref: 14549153
JVM_CONSTANT_Methodref: 14614689
JVM_CONSTANT_Methodref: 14942369
JVM_CONSTANT_Methodref: 12976292
JVM_CONSTANT_Methodref: 14024869
JVM_CONSTANT_Methodref: 14680229
JVM_CONSTANT_Methodref: 12910758
JVM_CONSTANT_Methodref: 13172902
JVM_CONSTANT_Methodref: 13369510
JVM_CONSTANT_Methodref: 13500582
JVM_CONSTANT_Methodref: 13762726
JVM_CONSTANT_Methodref: 13893798
JVM_CONSTANT_Methodref: 14090406
JVM_CONSTANT_Methodref: 14221478
JVM_CONSTANT_Methodref: 12976295
JVM_CONSTANT_Methodref: 13697191
JVM_CONSTANT_Methodref: 14287015
JVM_CONSTANT_Methodref: 14876839
JVM_CONSTANT_Methodref: 14352552
JVM_CONSTANT_Methodref: 14418088
JVM_CONSTANT_Methodref: 14811304
JVM_CONSTANT_Methodref: 14745769
JVM_CONSTANT_Methodref: 13041834
JVM_CONSTANT_Utf8: #Integer.java @ 0x00000000fa49f340 Oop @ 0x00000000fa49f340
JVM_CONSTANT_Utf8: #IntegerCache @ 0x00000000fa49f360 Oop @ 0x00000000fa49f360
hsdb> detach
hsdb> Input stream closed.
Raw
JavaObjectSizeCollector.java
package fx;
import java.util.*;
import sun.jvm.hotspot.oops.*;
public class JavaObjectSizeCollector implements OopVisitor {
private long totalSize;
private Set<Oop> visitedOops = new HashSet<Oop>();
public long getTotalSize() {
return totalSize;
}
public void reset() {
totalSize = 0L;
visitedOops.clear();
}
// Called before visiting an object
public void prologue() {
visitedOops.add(getObj());
totalSize += getObj().getObjectSize();
}
// Called after visiting an object
public void epilogue() {
}
private Oop obj;
public void setObj(Oop obj) { this.obj = obj; }
// Returns the object being visited
public Oop getObj() { return obj; }
// Callback methods for each field type in an object
public void doOop(OopField field, boolean isVMField) {
Oop current = getObj();
Oop oop = field.getValue(current);
if (oop != null && !visitedOops.contains(oop)) {
oop.iterate(this, false);
setObj(current);
}
}
public void doOop(NarrowOopField field, boolean isVMField) {
Oop current = getObj();
Oop oop = field.getValue(current);
if (oop != null && !visitedOops.contains(oop)) {
oop.iterate(this, false);
setObj(current);
}
}
public void doByte(ByteField field, boolean isVMField) {
}
public void doChar(CharField field, boolean isVMField) {
}
public void doBoolean(BooleanField field, boolean isVMField) {
}
public void doShort(ShortField field, boolean isVMField) {
}
public void doInt(IntField field, boolean isVMField) {
}
public void doLong(LongField field, boolean isVMField) {
}
public void doFloat(FloatField field, boolean isVMField) {
}
public void doDouble(DoubleField field, boolean isVMField) {
}
public void doCInt(CIntField field, boolean isVMField) {
}
}
Raw
JSDB session
$ pwd
/home/sajia/build/baseline-f0f676c5a2c6/agent/make
$ ./jsdbproc64.sh /home/sajia/jdk/6u25_x64/bin/java ~/experiment/test_array_gc/core.23346
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode)
Attaching to core /home/sajia/experiment/test_array_gc/core.23346 from executable /home/sajia/jdk/6u25_x64/bin/java, please wait...
WARNING: Hotspot VM version 20.0-b11 does not match with SA version 20.0-b11-internal. You may see unexpected results.
Debugger attached successfully.
Server compiler detected.
JVM version is 20.0-b11
jsdb> jvm.threads.toString()
[Thread (address=0x00000000ffcdc7a0, name=Low Memory Detector), Thread (address=0x00000000ffcdc670, name=C2 CompilerThread1), Thread (address=0x00000000ffcdc540, name=C2 CompilerThread0), Thread (address=0x00000000ffcdc410, name=Signal Dispatcher), Thread (address=0x00000000ffcb1320, name=Finalizer), Thread (address=0x00000000ffcb11e8, name=Reference Handler), Thread (address=0x00000000ffcb0840, name=main)]
jsdb> allThreads = jvm.threads
com.sun.script.javascript.JSAdapter@5328f6ee
jsdb> allThreads.toString()
[Thread (address=0x00000000ffcdc7a0, name=Low Memory Detector), Thread (address=0x00000000ffcdc670, name=C2 CompilerThread1), Thread (address=0x00000000ffcdc540, name=C2 CompilerThread0), Thread (address=0x00000000ffcdc410, name=Signal Dispatcher), Thread (address=0x00000000ffcb1320, name=Finalizer), Thread (address=0x00000000ffcb11e8, name=Reference Handler), Thread (address=0x00000000ffcb0840, name=main)]
jsdb> mainThread = allThreads[allThreads.length - 1]
com.sun.script.javascript.JSAdapter@3e110003
jsdb> mainThreadFrames = mainThread.frames
com.sun.script.javascript.JSAdapter@65b60280
jsdb> mainThreadFrames.toString()
[Frame (method=java.io.FileInputStream.readBytes(byte[], int, int), bci=0, line=0), Frame (method=java.io.FileInputStream.read(byte[], int, int), bci=4, line=220), Frame (method=java.io.BufferedInputStream.fill(), bci=175, line=218), Frame (method=java.io.BufferedInputStream.read(), bci=12, line=237), Frame (method=TestArrayGC.main(java.lang.String[]), bci=59, line=16)]
jsdb> mainFrame = mainThreadFrames[mainThreadFrames.length - 1]
com.sun.script.javascript.JSAdapter@538f1d7e
jsdb> mainFrame.toString()
Frame (method=TestArrayGC.main(java.lang.String[]), bci=59, line=16)
jsdb> mainFrame.locals
com.sun.script.javascript.JSAdapter@4e76fba0
jsdb> mainFrame.locals.toString()
{}
jsdb> mainFrame.toString()
Frame (method=TestArrayGC.main(java.lang.String[]), bci=59, line=16)
jsdb> mainFrame.locals.length
jsdb> typeof mainFrame.locals
function
jsdb> classof(mainFrame.locals)
java.lang.Object@6581ed9e
jsdb> mainFrame.line
16
jsdb> mainFrame.method.toString()
Method TestArrayGC.main(java.lang.String[])
jsdb> mainFrame.thisObject
jsdb> mainFrame.locals == null
false
jsdb> mainFrame.locals.toString()
{}
jsdb> typeof mainFrame.locals
function
jsdb> for (i in sa) { println(i) }
interpreter
threads
codeCache
symTbl
systemDictionary
typedb
objHeap
cdbg
sysDict
dbg
heap
vm
symbolTable
jsdb> sa.vm
sun.jvm.hotspot.runtime.VM@15aaf0b3
jsdb> sa.vm.universe.toString()
sun.jvm.hotspot.memory.Universe@9a082e2
jsdb> sa.threads.toString()
sun.jvm.hotspot.runtime.Threads@8f0c85e
jsdb> t = sa.threads.first()
sun.jvm.hotspot.runtime.LowMemoryDetectorThread@0x0000000043874800
jsdb> t = t.next()
sun.jvm.hotspot.runtime.CompilerThread@0x0000000043872800
jsdb> t = t.next()
sun.jvm.hotspot.runtime.CompilerThread@0x000000004386c800
jsdb> t = t.next()
sun.jvm.hotspot.runtime.JavaThread@0x000000004386a800
jsdb> t.toString()
sun.jvm.hotspot.runtime.JavaThread@0x000000004386a800
jsdb> t.threadName
Signal Dispatcher
jsdb> t = t.next()
sun.jvm.hotspot.runtime.JavaThread@0x0000000043849000
jsdb> t.threadName
Finalizer
jsdb> t = t.next()
sun.jvm.hotspot.runtime.JavaThread@0x0000000043847000
jsdb> t.threadName
Reference Handler
jsdb> t = t.next()
sun.jvm.hotspot.runtime.JavaThread@0x00000000437e2800
jsdb> t.threadName
main
jsdb> fst = new sapkg.runtime.StackFrameStream(t)
sun.jvm.hotspot.runtime.StackFrameStream@3b75078b
jsdb> frm = fst.current
sp: 0x00000000403ec9d0, unextendedSP: 0x00000000403ec9d0, fp: 0x00000000403eca38, pc: 0x00002aaaab034b0c
jsdb> frm.toString()
sp: 0x00000000403ec9d0, unextendedSP: 0x00000000403ec9d0, fp: 0x00000000403eca38, pc: 0x00002aaaab034b0c
jsdb> fst.next(); fst.next(); fst.next(); fst.next()
jsdb> frm = fst.current
sp: 0x00000000403ecbb8, unextendedSP: 0x00000000403ecbb8, fp: 0x00000000403ecc00, pc: 0x00002aaaab02896e
jsdb> frm.isJavaFrame()
true
jsdb> frm.isInterpretedFrame()
true
jsdb> m.name
sun.jvm.hotspot.oops.Symbol@fa404228
jsdb> m.name.toString()
sun.jvm.hotspot.oops.Symbol@fa404228
jsdb> m.name.asString()
main
jsdb> intArrayOop = addr2oop(frm.addressOfInterpreterFrameLocal(1).getOopHandleAt(0))
sun.jvm.hotspot.oops.TypeArray@ffce5af8
jsdb> integerArrayEmptyOop = addr2oop(frm.addressOfInterpreterFrameLocal(2).getOopHandleAt(0))
sun.jvm.hotspot.oops.ObjArray@ffd25b08
jsdb> integerArrayFullOop = addr2oop(frm.addressOfInterpreterFrameLocal(3).getOopHandleAt(0))
sun.jvm.hotspot.oops.ObjArray@ffd65b18
jsdb> intArrayOop.objectSize
262160
jsdb> integerArrayEmptyOop.objectSize
262160
jsdb> integerArrayFullOop.objectSize
262160
jsdb> intArrayOop.print()
[I @ 0x00000000ffce5af8 (object size = 262160)
- _mark: {0} :1
- _metadata._compressed_klass: {8} :TypeArrayKlass for [I @ 0x00000000fa4012f0
- 0: {16} :256
- 1: {20} :257
- 2: {24} :258
...
- 65534: {262152} :65790
- 65535: {262156} :65791
jsdb> integerArrayEmptyOop.print()
ObjArray @ 0x00000000ffd25b08 (object size = 262160)
- _mark: {0} :1
- _metadata._compressed_klass: {8} :ObjArrayKlass for InstanceKlass for java/lang/Integer @ 0x00000000fa67c368
- 0: {16} :null
- 1: {20} :null
- 2: {24} :null
...
- 65534: {262152} :null
- 65535: {262156} :null
jsdb> integerArrayFullOop.print()
ObjArray @ 0x00000000ffd65b18 (object size = 262160)
- _mark: {0} :1
- _metadata._compressed_klass: {8} :ObjArrayKlass for InstanceKlass for java/lang/Integer @ 0x00000000fa67c368
- 0: {16} :Oop for java/lang/Integer @ 0x00000000ffce4ff8
- 1: {20} :Oop for java/lang/Integer @ 0x00000000ffce5008
- 2: {24} :Oop for java/lang/Integer @ 0x00000000ffce5018
...
- 65534: {262152} :Oop for java/lang/Integer @ 0x00000000ffea5018
- 65535: {262156} :Oop for java/lang/Integer @ 0x00000000ffea5028
jsdb> sizeCollect = new Packages.fx.JavaObjectSizeCollector()
fx.JavaObjectSizeCollector@58d9660d
jsdb> intArrayOop.iterate(sizeCollect, false)
jsdb> sizeCollect.totalSize
262160
jsdb> sizeCollect.reset()
jsdb> integerArrayEmptyOop.iterate(sizeCollect, false)
jsdb> sizeCollect.totalSize
262160
jsdb> sizeCollect.reset()
jsdb> integerArrayFullOop.iterate(sizeCollect, false)
jsdb> sizeCollect.totalSize
1310736
Raw
TestArrayGC.java
public class TestArrayGC {
private static final int LENGTH = 0x10000;
public static void main(String[] args) throws Exception {
int[] intArray = new int[LENGTH];
Integer[] integerArrayEmpty = new Integer[LENGTH];
Integer[] integerArrayFull = new Integer[LENGTH];
for (int i = 0; i < LENGTH; i++) {
int value = 256 + i;
intArray[i] = value;
integerArrayFull[i] = value;
}
// hold the process, wait for heap dump
System.in.read();
}
}
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