JVMコマンドラインモニタツールの詳細

NAME
       jinfo - configuration info

SYNOPSIS
       jinfo [ option ] pid
       jinfo [ option ] executable core
       jinfo [ option ] [ server-id@ ] remote-hostname-or-IP

PARAMETERS
       Options are mutually exclusive. Option, if used, should follow immediately after the command name. See OPTIONS below.

       pid            process  id  for which the configuration info is to be printed. The process must be a Java process. To get a
                      list of Java processes running on a machine, jps many be used.

       executable     Java executable from which the core dump was produced.

       core           core file for which the configuration info is to be printed.

       remote-hostname-or-IP
                      remote debug server's (see jsadebugd) hostname or IP address.

       server-id      optional unique id, if multiple debug servers are running on the same remote host.

DESCRIPTION
       jinfo prints Java configuration information for a given Java process or core file or a remote debug server.   Configuration
       information includes Java System properties and Java virtual machine command line flags.

       NOTE  -  This utility is unsupported and may or may not be available in future versions of the J2SE SDK.  jinfo is not cur-
       rently available on Windows platforms or on the Linux Itanium platform.

OPTIONS
           prints both command line flags as well as System properties name, value pairs

       -flags         prints command line flags as name, value pairs

       -sysprops      prints JavaSystem properties as name, value pairs

jianlejundeMBP:~ allan$ lsof -i:8081
COMMAND   PID  USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
STS     25301 allan   76u  IPv6 0x7664412dd30e5b9d      0t0  TCP localhost:58969->localhost:sunproxyadmin (CLOSE_WAIT)
java    31978 allan   52u  IPv6 0x7664412dc6198e1d      0t0  TCP *:sunproxyadmin (LISTEN)

jianlejundeMBP:~ allan$ jps -l
pid         
25301 
31978 org.apache.catalina.startup.Bootstrap
32266 sun.tools.jps.Jps

jianlejundeMBP:~ allan$ jinfo -flags 31978
Attaching to process ID 31978, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.141-b15

**************    ************
Non-default VM flags: -XX:CICompilerCount=3 -XX:InitialHeapSize=134217728 -XX:MaxHeapSize=268435456 -XX:MaxNewSize=67108864 -XX:MinHeapDeltaBytes=524288 -XX:NewSize=67108864 -XX:OldSize=67108864 -XX:ThreadStackSize=32768 -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseFastUnorderedTimeStamps -XX:+UseParallelGC 

**************    ************
Command line:  -Xmx256m -Xms128m -Xmn64m -Xss32m -Dcatalina.base=/Users/allan/Documents/STSworkspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0 -Dcatalina.home=/Users/allan/Documents/tomcat_CRM_trunk/apache-tomcat-8.5.16 -Dwtp.deploy=/Users/allan/Documents/STSworkspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps -Djava.endorsed.dirs=/Users/allan/Documents/tomcat_CRM_trunk/apache-tomcat-8.5.16/endorsed -Dfile.encoding=UTF-8

jianlejundeMBP:~ allan$ jps -l
33232 org.apache.catalina.startup.Bootstrap
32467 
33339 sun.tools.jps.Jps

NAME
       jmap - memory map

SYNOPSIS
       jmap [ option ] pid
       jmap [ option ] executable core
       jmap [ option ] [ server-id@ ] remote-hostname-or-IP

DESCRIPTION
       jmap prints shared object memory maps or heap memory details of a given process or core file or remote debug server.

       NOTE  -  This  utility  is unsupported and may or may not be available in future versions of the J2SE SDK.  jmap is not currently available on Windows platforms or on the Linux
       Itanium platform.

PARAMETERS
       option         Options are mutually exclusive. Option, if used, shouldfollow immediately after the command name.

       pid            process id for which the memory map is to be printed.  The process must be a Java process. To get a list of Java processes running on a machine, jps may be used.

       executable     Java executable from which the core dump was produced.

       core           core file for which the memory map is to be printed.

       remote-hostname-or-IP
                      remote debug server's (see jsadebugd) hostname or IP address.

       server-id      optional unique id, if multiple debug servers are running on the same remote host.

OPTIONS
           When  no  option is used jmap prints shared object mappings. For each shared object loaded in the target VM, start address, the size of the mapping, and the full
                      path of the shared object file are printed. This is similar to the Solaris pmap utility.
       -dump: to dump java heap in hprof binary format
                         dump-options:
                           live         dump only live objects; if not specified,
                                        all objects in the heap are dumped.
                           format=b     binary format
                           file=  dump heap to 

       -heap          Prints a heap summary. GC algorithm used, heap configuration and generation wise heap usage are printed.

       -histo         Prints a histogram of the heap. For each Java class, number of objects, memory size in bytes, and fully qualified class names  are  printed.  VM  internal  class
                      names are printed with '*' prefix.

       -permstat      Prints class loader wise statistics of permanent generation of Java heap. For each class loader, its name, liveness, address, parent class loader, and the number
                      and size of classes it has loaded are printed.

       -h             Prints a help message.

       -help          Prints a help message.

SEE ALSO
       pmap(1) jps(1) jsadebugd(1)

jianlejundeMBP:~ allan$ jmap -heap 35133
Attaching to process ID 35133, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.141-b15(     )

using thread-local object allocation.
Parallel GC with 4 thread(s)（       ）

Heap Configuration:(Java      )
   MinHeapFreeRatio         = 0 （      n     ）
   MaxHeapFreeRatio         = 100 （      n     ，2    Xmx==Xms       ）
   MaxHeapSize              = 268435456 (256.0MB) （       ）
   NewSize                  = 67108864 (64.0MB)  （       ）
   MaxNewSize               = 67108864 (64.0MB)   (         )
   OldSize                  = 67108864 (64.0MB)   （       ）
   NewRatio                 = 2（            ，OLD/NEW=2）
   SurvivorRatio            = 8(  Eden:S1:S2=8:1:1,  jvm     )
   MetaspaceSize            = 21807104 (20.796875MB)
   CompressedClassSpaceSize = 1073741824 (1024.0MB)
   MaxMetaspaceSize         = 17592186044415 MB
   G1HeapRegionSize         = 0 (0.0MB)

Heap Usage:（        ）
PS Young Generation
Eden Space:
   capacity = 66060288 (63.0MB) （    ）
   used     = 22447528 (21.407630920410156MB) （   ）
   free     = 43612760 (41.592369079589844MB) （  ）
   33.980366540333584% used  （         ）
From Space:
   capacity = 524288 (0.5MB)
   used     = 262144 (0.25MB)
   free     = 262144 (0.25MB)
   50.0% used
To Space:
   capacity = 524288 (0.5MB)
   used     = 0 (0.0MB)
   free     = 524288 (0.5MB)
   0.0% used
PS Old Generation
   capacity = 77594624 (74.0MB)
   used     = 17072000 (16.2811279296875MB)
   free     = 60522624 (57.7188720703125MB)
   22.00152422930743% used

17747 interned Strings occupying 2199536 bytes.

jianlejundeMBP:~ allan$ jmap -dump:live,format=b,file=Documents/mydumpfile.bin 35133
Dumping heap to /Users/shoje/Documents/mydumpfile.bin ...
Heap dump file created

num     #instances         #bytes  class name
----------------------------------------------
   1:         52125        8561888  [C
   2:         50953        1222872  java.lang.String
   3:          1070         760600  [B
   4:          8022         705936  java.lang.reflect.Method
   5:          6084         683624  java.lang.Class
   6:         15582         498624  java.util.HashMap$Node
   7:         13256         424192  java.util.concurrent.ConcurrentHashMap$Node
   8:          6271         376712  [Ljava.lang.Object;
   9:          1789         233008  [Ljava.util.HashMap$Node;
  10:          6766         216512  java.lang.ref.WeakReference
  11:          3658         146320  java.lang.ref.SoftReference
  12:          3326         133040  java.util.LinkedHashMap$Entry
  13:          7725         123600  java.lang.Object
  14:          2790         115416  [Ljava.lang.String;
  15:          2757         112008  [I
  16:           118         102592  [Ljava.util.concurrent.ConcurrentHashMap$Node;
  17:          4041          96984  java.beans.MethodRef
  18:          1985          95280  java.util.HashMap
  19:          1607          89992  java.beans.MethodDescriptor
  20:          3589          86136  java.util.ArrayList
  21:          1499          83944  java.util.LinkedHashMap
        .
        .
        .
        .
        .
        .

"Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007fca55839000 nid=0x2e03 in Object.wait() [0x0000700001e04000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x0000000797bda188> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
	- locked <0x0000000797bda188> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
	at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)


"main" #1 prio=5 os_prio=31 tid=0x00007fca55806800 nid=0x2503 runnable [0x00007000016ee000]
   java.lang.Thread.State: RUNNABLE
	at java.net.PlainSocketImpl.socketAccept(Native Method)
	at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409)
	at java.net.ServerSocket.implAccept(ServerSocket.java:545)
	at java.net.ServerSocket.accept(ServerSocket.java:513)
	at org.apache.catalina.core.StandardServer.await(StandardServer.java:466)
	at org.apache.catalina.startup.Catalina.await(Catalina.java:744)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:690)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)

"VM Thread" os_prio=31 tid=0x00007fca5600b000 nid=0x2c03 runnable 

"GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007fca55009000 nid=0x2107 runnable 

"GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007fca56003000 nid=0x2a03 runnable