jdk8:jmap

编程语言 2018-07-26 22:53:02 阅读次数: 0

jmap作用，获取dump文件，查询finalize执行队列，java堆栈以及类加载器统计。

显示堆栈信息

[@82995c215909 /opt/logs]$ jmap -heap 12527
Attaching to process ID 12527, please wait…
Debugger attached successfully.
Server compiler detected.
JVM version is 25.101-b13

using thread-local object allocation.
Parallel GC with 33 thread(s) //GC 方式

Heap Configuration://堆内存初始化配置
MinHeapFreeRatio = 0 //对应jvm启动参数-XX:MinHeapFreeRatio设置JVM堆最小空闲比率(default 40)
MaxHeapFreeRatio = 100//对应jvm启动参数 -XX:MaxHeapFreeRatio设置JVM堆最大空闲比率(default 70)
MaxHeapSize = 6410993664 (6114.0MB)/对应jvm启动参数-XX:MaxHeapSize=设置JVM堆的最大大小
NewSize = 2306867200 (2200.0MB)//对应jvm启动参数-XX:NewSize=设置JVM堆的‘新生代’的默认大小
MaxNewSize = 2306867200 (2200.0MB)//对应jvm启动参数-XX:MaxNewSize=设置JVM堆的‘新生代’的最大大小
OldSize = 4104126464 (3914.0MB)//对应jvm启动参数-XX:OldSize=:设置JVM堆的‘老生代’的大小
NewRatio = 2//对应jvm启动参数-XX:NewRatio=:‘新生代’和‘老生代’的大小比率
SurvivorRatio = 8//对应jvm启动参数-XX:SurvivorRatio=设置年轻代中Eden区与Survivor区的大小比值
MetaspaceSize = 21807104 (20.796875MB) //对应jvm启动参数-MetaspaceSize=:设置JVM堆的‘元空间’的初始大小; 分配给类元数据空间的初始大小(Oracle逻辑存储上的初始高水位，the initial high-water-mark ). 此值为估计值. MetaspaceSize设置得过大会延长垃圾回收时间. 垃圾回收过后, 引起下一次垃圾回收的类元数据空间的大小可能会变大
CompressedClassSpaceSize = 1073741824 (1024.0MB) //类指针压缩空间大小, 默认为1G
MaxMetaspaceSize = 17592186044415 MB //对应jvm启动参数-MaxMetaspaceSize=:设置JVM堆的‘元空间’的最大;是分配给类元数据空间的最大值, 超过此值就会触发Full GC. 此值仅受限于系统内存的大小, JVM会动态地改变此值
G1HeapRegionSize = 0 (0.0MB) // G1区块的大小, 取值为1M至32M. 其取值是要根据最小Heap大小划分出2048个区块.

Heap Usage:////堆内存使用情况
PS Young Generation
Eden Space:
capacity = 2218786816 (2116.0MB)
used = 1542297984 (1470.8499755859375MB)
free = 676488832 (645.1500244140625MB)
69.51086841143372% used
From Space:
capacity = 44564480 (42.5MB)
used = 5882544 (5.6100311279296875MB)
free = 38681936 (36.88996887207031MB)
13.2000732421875% used
To Space:
capacity = 43515904 (41.5MB)
used = 0 (0.0MB)
free = 43515904 (41.5MB)
0.0% used
PS Old Generation
capacity = 4104126464 (3914.0MB)
used = 55148024 (52.59325408935547MB)
free = 4048978440 (3861.4067459106445MB)
1.3437213615062715% used

27444 interned Strings occupying 3154336 bytes.

显示堆中对象统计信息，包含类，实例数量，合计容量

-histo[:live]        to print histogram of java object heap; if the "live"

[@82995c215909 /opt/logs]$ jmap -histo 12527

 num     #instances         #bytes  class name
 编号     个数                字节     类名
----------------------------------------------
   1:       3472120      448670168  [C
   2:       2133951      400454032  [B
   3:         42628      298218744  [I
   4:       2037477       89988696  [Ljava.lang.Object;
   5:       3031288       72750912  java.lang.String
   6:       1308033       41857056  java.util.HashMap$Node
   7:       1673694       34107192  [Ljava.lang.Class;
   8:        363209       22618424  [Ljava.util.HashMap$Node;
   9:        830984       19943616  java.util.IdentityHashMap$EntryIterator$Entry
  10:        181240       14499200  java.lang.reflect.Constructor
  11:        422551       13521632  com.alibaba.fastjson.parser.ParseContext
  12:        249533       11977584  java.util.HashMap
  13:          4039        9598224  [J
  14:        178068        8547264  java.util.IdentityHashMap$EntryIterator
  15:        134148        7512288  java.util.LinkedHashMap
  16:        303126        7275024  java.lang.Long
  17:        163622        5235904  java.util.concurrent.locks.AbstractQueuedSynchronizer$Node
  18:         12526        4549984  [Lcom.alibaba.fastjson.parser.ParseContext;
  19:        141422        4525504  java.util.LinkedHashMap$LinkedKeyIterator
  20:        107257        4275968  [Ljava.lang.String;
  21:        120468        3854976  java.util.concurrent.ConcurrentHashMap$Node
  22:         95655        3826200  java.util.LinkedHashMap$Entry
  23:         43136        3795968  java.lang.reflect.Method
  24:         78713        3778224  java.nio.HeapByteBuffer
  25:        132668        3184032  java.util.ArrayList

类加载器统计

[@82995c215909 /opt/logs]$ jmap -clstats 12527
Attaching to process ID 12527, please wait…
Debugger attached successfully.
Server compiler detected.
JVM version is 25.101-b13
finding class loader instances ..

done.
computing per loader stat ..done.
please wait.. computing liveness.liveness analysis may be inaccurate …
class_loader classes bytes parent_loader alive? type
类加载器 类的个数 字节数 父类加载器 存活？ 类型
2837 4995376 null live
0x0000000641e00be0 4 3471 null dead sun/misc/Launcher E x t C l a s s L o a d e r @ 0 x 00000007 c 000 f a 30 0 x 0000000642 f 15 f f 0 37 90501 0 x 0000000641 e 00 b 80 d e a d c o m / a l i b a b a / f a s t j s o n / u t i l / A S M C l a s s L o a d e r @ 0 x 00000007 c 03 c 7 d c 0 0 x 00000006430 e 3108 1 1474 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 2 c d 8 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006420 c 3 f 00 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 3 e d 0 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006420 c 3 b 18 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000736956 c 80 1 1471 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 3 f 18 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 37 c 8 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643484 f 50 1 9702 0 x 0000000641 e 00 b 80 d e a d o r g / s p r i n g f r a m e w o r k / b o o t / c o n t e x t / e m b e d d e d / t o m c a t / T o m c a t E m b e d d e d W e b a p p C l a s s L o a d e r @ 0 x 00000007 c 049 f 0 e 0 0 x 00000006420 c 4 d 10 2 4839 n u l l d e a d j a v a x / m a n a g e m e n t / r e m o t e / r m i / N o C a l l S t a c k C l a s s L o a d e r @ 0 x 00000007 c 00 a 8 f d 8 0 x 00000006440 d 6 e 10 1 1485 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 3810 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 5110 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 30 c 0 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006420 c 4928 1 880 n u l l d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 3428 1 1474 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 2 f f 8 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006420 c 4220 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 2 d 20 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 28 f 0 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 41 f 0 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 45 f 0 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006420 c 3 e 38 1 1471 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006440 d 6738 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 4238 1 1471 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 3 a e 8 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006420 c 3730 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 3 b 30 1 1485 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 33 e 0 1 1495 n u l l d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006440 d 6 d 48 1 1472 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 3748 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 3 f 98 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006420 c 4540 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 3040 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 3890 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006420 c 4158 1 1471 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 2 c 58 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 3188 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000642 f 26 c a 8 18 47205 0 x 0000000641 e 00 b 80 d e a d c o m / a l i b a b a / f a s t j s o n / u t i l / A S M C l a s s L o a d e r @ 0 x 00000007 c 03 c 7 d c 0 0 x 00000006420 c 3 a 50 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 00000006430 e 3 e 50 1 1473 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 2 a 80 1 880 0 x 0000000641 e 00 b 80 d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000643 d e 4380 1 880 n u l l d e a d s u n / r e f l e c t / D e l e g a t i n g C l a s s L o a d e r @ 0 x 00000007 c 0009 d f 8 0 x 0000000641 e 00 b 80 8657 14761058 0 x 0000000641 e 00 b e 0 d e a d s u n / m i s c / L a u n c h e r AppClassLoader@0x00000007c000f688
0x00000006420c3668 1 1476 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e3a68 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de29b8 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de42b8 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de46b8 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c4860 1 880 null dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e3360 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3bb0 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c4478 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e2f78 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de34a8 1 1471 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006421a1a60 0 0 0x0000000641e00b80 dead java/util/ResourceBundle$RBClassLoader@0x00000007c00bff00
0x00000006420c3d70 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006440d6670 1 1483 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e4170 1 1471 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de2da0 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c3988 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000736954810 1 1471 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e3d88 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3958 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006440d6c80 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e3680 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3250 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006440d6398 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e3298 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e4b98 1 1505 null dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de2b48 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de4448 1 1474 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c4090 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3d40 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000738f16450 1 880 null dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c3ca8 1 1476 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006440d65a8 1 880 null dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000736959230 1 1471 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e40a8 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3c78 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e39a0 1 1485 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3570 1 1471 null dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e35b8 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de2e68 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c43b0 1 1471 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e2eb0 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de4060 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c3fc8 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3318 1 1471 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c38c0 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e3cc0 1 1471 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de2c10 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006440d6ed8 1 1499 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e38d8 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e51d8 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3e08 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e31d0 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3700 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c42e8 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c4de8 4 4029 null dead javax/management/remote/rmi/NoCallStackClassLoader@0x00000007c00a8fd8
0x00000006430e2de8 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3638 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c3be0 1 1471 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006440d64e0 1 1473 null dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e26e0 1 880 null dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e3fe0 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de2f30 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c33f8 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006420c37f8 1 1474 null dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e3bf8 1 1473 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de2828 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de4128 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de4528 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x00000006430e34f0 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8
0x0000000643de3a20 1 880 0x0000000641e00b80 dead sun/reflect/DelegatingClassLoader@0x00000007c0009df8

total = 118 11669 20043639 N/A alive=1, dead=117 N/A

生成java堆的快照

[@82995c215909 /opt/logs]$ jmap -dump:format=b,file=/tmp/text1 12527
Dumping heap to /tmp/text1 …
Heap dump file created

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