Jstat of JVM Monitoring tools

1.jstat for outputting statistics for a specified Java process

Usage:
Jstat:jstat-<option> [-t] [-h<lines>] <vmid> [<interval> [<count>]
The <option> is the option that must be provided, all available options can be listed using Jstat-options

[[email protected]_82_178_redhat ~]# jstat -options-class-compiler-gc-gccapacity-gccause-gcmetacapacity-gcnew-gcnewcapacity-gcold-gcoldcapacity-gcutil-printcompilation

2. Common options (included in the output column name for each option)

Class: The behavior of statistical classloader
Compiler: Statistics the behavior of the hotspot Just-in-time compiler
GC: Statistical GC Behavior
Gccapacity: The capacity and space of the generation in the statistical heap
Gccause: Garbage collection statistics, including recent events that cite garbage collection, are basically the same as Gcutil, with two more columns than gcutil
Gcnew: Statistical behavior of the Cenozoic
Gcnewcapacity: Statistics on the size and space of the Cenozoic
Gcold: Statistics on the behavior of old generation
Gcoldcapacity: Statistics on the size and space of old generation
Gcpermcapacity: Statistics on the size and space of permanent generations
Gcutil: Garbage Collection statistics
Printcompilation:hotspot Compilation Method Statistics
-h n per n samples, show header once
-T n displays the timestamp column in the first column, and the timestamp is calculated from the beginning of the JVM startup
<vmid> is the process number
<interval> interval is a monitoring time interval, in which the unit is subtle and does not provide means a single output
<count> count is the maximum number of outputs, not provided and the monitoring interval has values, the infinite printing

3. Introduction to the use of specific parameters

1.class options:

#jstat-class 4214 2000 10 (monitored every 2 seconds, 10 times)

Loaded Bytes Unloaded Bytes  Time 9197   18418.   0 0    0.0  12.49 9197   18418.   0 0    0.0  12.49列名介绍：Column  DescriptionLoaded  被读入类的数量Bytes   被读入的字节数（K）Unloaded    被卸载类的数量Bytes   被卸载的字节数（K）Time    花费在load和unload类的时间

2. Option-compiler

[[email protected] test001]# jstat -compiler  13614Compiled Failed Invalid   Time   FailedType FailedMethod3463      2       0    70.23          1 org/apache/tomcat/util/IntrospectionUtils setProperty

3.GC options:

[[email protected] test001]# jstat -gc 13614 2000 10      S0C    S1C    S0U    S1U      EC       EU        OC         OU       PC     PU    YGC     YGCT    FGC    FGCT     GCT   69888.0 69888.0  0.0   440.5  559232.0 392816.0 1398144.0   200682.0  131072.0 91892.5    665    5.352   0      0.000    5.35269888.0 69888.0  0.0   440.5  559232.0 392816.0 1398144.0   200682.0  131072.0 91892.5    665    5.352   0      0.000    5.352

The column name describes:

Column  DescriptionS0C 当前S0的容量 (KB)S1C 当前S1的容量 (KB)S0U S0已使用 (KB)S1U S1已使用 (KB)EC  当前eden的容量(KB)EU  Eden已使用 (KB)OC  当前old的容量(KB)OU  Old已使用 (KB)PC  当前perm的容量 (KB)PU  Perm已使用 (KB)YGC young代gc的次数YGCT    young代gc花费的时间FGC full gc的次数FGCT    full gc的时间GCT 垃圾收集收集的总时间

4.gccapacity options:
The new generation is counted every two seconds, counting 5 times.

[[email protected] test001]# jstat -gccapacity  13614 2000 5 NGCMN    NGCMX     NGC     S0C   S1C       EC      OGCMN      OGCMX       OGC         OC      PGCMN    PGCMX     PGC       PC     YGC    FGC 699008.0 699008.0 699008.0 69888.0 69888.0 559232.0  1398144.0  1398144.0  1398144.0  1398144.0 131072.0 262144.0 131072.0 131072.0    699     0

列名介绍：Column  DescriptionNGCMN   年轻代的最小容量 (KB)NGCMX   年轻代的最大容量 (KB)NGC 当前年轻代的容量 (KB)S0C 当前S0的空间 (KB)S1C 当前S1的空间 (KB)EC  当前eden的空间 (KB)OGCMN   年老代的最小容量 (KB)OGCMX   年老代的最大容量 (KB)OGC 当前年老代的容量 (KB)OC  当前年老代的空间 (KB)PGCMN   永久代的最小容量 (KB)PGCMX   永久代的最大容量 (KB)PGC 当前永久代的容量 (KB)PC  当前永久代的空间 (KB)YGC 年轻代gc的次数FGC full gc的次数

5.gccause Parameters:

[[email protected] ~]# jstat -gccause 13614  S0     S1     E      O      P     YGC     YGCT    FGC    FGCT     GCT    LGCC       GCC                   1.63   0.00  33.97  14.39  70.21    726    5.674     0    0.000    5.674 Allocation Failure   No GC

The column name describes:

Column  DescriptionLGCC    最近垃圾回收的原因GCC 当前垃圾回收的原因

6.gcnew options:

7.gcoldcapacity Options

[[email protected] ~]# jstat -gcoldcapacity  13614   OGCMN       OGCMX        OGC         OC       YGC   FGC    FGCT     GCT     1398144.0   1398144.0   1398144.0   1398144.0   779     0    0.000    5.976

The column name describes:

Column  DescriptionOGCMN   最小年老代容量 (KB)OGCMX   最大年老代容量(KB)OGC 当前年老代容量 (KB)OC  当前年老代空间 (KB)YGC 年轻代gc次数FGC full gc次数FGCT    full gc时间GCT 垃圾收集总时间

8.gcutil

[[email protected] ~]# jstat -gcutil 13614 2000 10                               S0     S1     E      O      P     YGC     YGCT    FGC    FGCT     GCT     0.68   0.00  98.02  14.48  70.23    804    6.117     0    0.000    6.117  0.00   0.83  34.27  14.48  70.23    805    6.124     0    0.000    6.124  0.00   0.83  34.27  14.48  70.23    805    6.124     0    0.000    6.124

The column name describes:

Column  DescriptionS1  S1使用百分比E   eden使用百分比O   old使用百分比P   perm使用百分比YGC 年轻代gc次数YGCT    年轻代gc时间FGC full gc次数FGCT    full gc时间GCT 垃圾收集总时间

9.printcompilation
Methods for compiling statistics

[[email protected] ~]# jstat -printcompilation 13614Compiled  Size  Type Method    3514    173    1 net/sf/jsqlparser/parser/CCJSqlParser jj_scan_token

[[email protected] ~]# jstat -printcompilation 13614Compiled  Size  Type Method3516    126    1 java/security/Provider$ServiceKey hashCode

The column name describes:

Column  DescriptionCompiled    被执行的编译任务的数量Size    方法字节码的字节数Type    编译类型Method  编译方法的类名和方法名。类名使用"/" 代替 "." 作为空间分隔符. 方法名是给出类的方法名. 格式是一致于HotSpot - XX:+PrintComplation 选项

4. Detailed stack memory space usage status information view analysis

Jmap-heap 4214

Attaching to process ID 4214, please wait ... Debugger attached successfully. Server compiler detected. The JVM version is 24.55-b03 using parallel threads in the new generation. Using Thread-local object allocation. Concurrent mark-sweep GC heap configuration: # heap config condition minheapfreeratio = 40 # Most Small heap usage ratio maxheapfreeratio = 70 # Maximum heap available scale maxheapsize = 2684354560 (2560.0MB) # Maximum heap space size newsize = 713031680 (680.0MB) # cenozoic allocation size maxnewsize = 713031680 (680.0MB) # Maximum available Cenozoic allocation size oldsize = 5439488 (5.18 75MB) # old age Size Newratio = 2 # Cenozoic Ratio survivorratio = 8 # The ratio of Cenozoic to suvivor permsize = 251658240 (240.0MB) # perm area Size MaxPermSize = 251658240 (240.0MB) # Maximum assignable perm area large  Small g1heapregionsize = 0 (0.0MB) # G1 heap Area Size heap usage: # Heap usage new Generation (Eden + 1 Survivor space): # Cenozoic (Eden Zone + survior) capacity =641728512 (612.0MB) # Eden area Capacity used = 507109064 (483.6168899536133MB) # already used size free = 134619448 (128.3831100463  8672MB) # remaining capacity 79.0223676394793% used # usage ratio eden Space: # Eden District Capacity = 570425344 (544.0MB) # Eden area Capacity used = 503156488 (479.84741973876953MB) # Eden Zone Use free = 67268856 (64.1525802612 3047MB) # The current remaining capacity of Eden District 88.2072462755091% used # Eden area usage from Space: # s Urvior1 Zone capacity = 71303168 (68.0MB) # Survior1 area capacity used = 3952576 (3.76947021484375MB) # Surviror1 zone used Situation free = 67350592 (64.23052978515625MB) # Surviror1 area remaining capacity 5.543338551240809% used # Survior1 area use proportional to Space: # Survior2 Zone capacity = 71303168 (68.0MB) # Survior2 area capacity used = 0 (0.0M                                  B) # Survior2 area Used free = 71303168 (68.0MB) # Survior2 area remaining capacity 0.0% used# Survior2 Zone Use proportional concurrent mark-sweep generation: # Laosheng Generation usage capacity = 1971322880 (1880.0MB) # Laosheng generation capacity used = 1514740296 (1444.5689163208008MB) # Laosheng used Capacity free = 456582584 (435.4310836791992MB) # Laosheng generation remaining capacity 76.83877214472345% use             D # Laosheng Use proportional perm Generation: # perm Zone Usage capacity = 251658240 (240.0MB) # perm Area Capacity used = 57814400 (55.1361083984375MB) # perm area used Capacity free = 193843840 (184.8638916015625MB) # Perm Area remaining capacity Volume 22.973378499348957% used # perm zone use proportional 28645 interned Strings occupying 3168232 bytes.

Reference Documentation:
http://nolinux.blog.51cto.com/4824967/1588716

Jstat of JVM Monitoring tools