JAVA自带监控工具的介绍
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JAVA自带监控工具的介绍
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JINFO 可以輸出并修改運行時的java進程的參數（JVM參數和Java System屬性） jinfo? pid 會打印出詳細的jvm運行參數和Java System屬性。 此命令內容較多。而且輸出的也稍慢。不過可以用以下命令來打印出你所關注的參數。 jinfo -flag MaxPermSize pid 該命令查看某個進程的MaxPermSize（MaxPermSize 可以換任意JVM參數 比如PermSize） ? [xxxxxxxx ~]$ jinfo -flag MaxPermSize 12191
-XX:MaxPermSize=134217728 ? [xxxxxxxx ~]$ jinfo -flag PermSize 12191
-XX:PermSize=134217728 ? [admin@dw_web4 ~]$ jinfo -flag LargePageSizeInBytes 12191
-XX:LargePageSizeInBytes=134217728 ? 用main jinfo查看更多使用方法介紹
JSTAT（我最喜歡用的） 另外還有一個jvmstat 可視化的，我這里不做介紹 有興趣http://java.sun.com/performance/jvmstat/ 下載玩玩 監視VM的內存工具，可以用來監視vm內存內的各種堆和非堆的大小及其內存使用量，可以觀察到classloader，compiler，gc相關信息。（興趣高起來了 等下我在提供一個JVM內存管理的圖，上一篇博客關于java內存模型主要是介紹寫并發程序） jstat -gcutil：統計gc時，heap情況 [xxxxxxxx ~]$ jstat -gcutil 12191 250 7
? S0???? S1???? E????? O????? P???? YGC???? YGCT??? FGC??? FGCT???? GCT??
100.00?? 0.00? 70.12?? 2.33? 43.55????? 4??? 0.243???? 0??? 0.000??? 0.243
100.00?? 0.00? 70.12?? 2.33? 43.55????? 4??? 0.243???? 0??? 0.000??? 0.243
100.00?? 0.00? 70.79?? 2.33? 43.56????? 4??? 0.243???? 0??? 0.000??? 0.243
100.00?? 0.00? 75.15?? 2.33? 43.79????? 4??? 0.243???? 0??? 0.000??? 0.243
100.00?? 0.00? 75.15?? 2.33? 43.79????? 4??? 0.243???? 0??? 0.000??? 0.243
100.00?? 0.00? 81.15?? 2.33? 44.51????? 4??? 0.243???? 0??? 0.000??? 0.243
100.00?? 0.00? 83.15?? 2.33? 44.63????? 4??? 0.243???? 0??? 0.000??? 0.243 間隔250毫秒 打印7行 ? jstat -gccause 監控內存使用情況 參數 （查看內存溢出相對有用） [xxxxxxxx ~]$ jstat -gccause 12191 3000 （每隔3秒監控一次）
? S0???? S1???? E????? O????? P???? YGC???? YGCT??? FGC??? FGCT???? GCT??? LGCC???????????????? GCC????????????????
100.00?? 0.00? 93.97?? 2.35? 44.71????? 4??? 0.259???? 0??? 0.000??? 0.259 unknown GCCause????? No GC??????????????
100.00?? 0.00? 93.97?? 2.35? 44.72????? 4??? 0.259???? 0??? 0.000??? 0.259 unknown GCCause????? No GC …. …. 下面copy一份介紹： S0? Survivor space 0 utilization as a percentage of the space’s current capacity.
S1? Survivor space 1 utilization as a percentage of the space’s current capacity.
E? Eden space utilization as a percentage of the space’s current capacity.
O? Old space utilization as a percentage of the space’s current capacity.
P Permanent space utilization as a percentage of the space’s current capacity.
YGC Number of young generation GC events.
YGCT Young generation garbage collection time.
FGC? Number of full GC events.
FGCT Full garbage collection time.
GCT Total garbage collection time.
LGCC? Cause of last Garbage Collection.
GCC Cause of current Garbage Collection. ? jstat -class pid:顯示加載class的數量，及所占空間等信息。 ? [xxxxxxxx web-deploy]$ jstat -class 12191
Loaded? Bytes? Unloaded? Bytes???? Time??
? 8209 17577.9??????? 0???? 0.0?????? 1.68 ? jstat -compiler pid:顯示VM實時編譯的數量等信息。 [xxxxxxxx web-deploy]$ jstat -compiler 12191
Compiled Failed Invalid?? Time?? FailedType FailedMethod
??? 1029????? 0?????? 0???? 9.42????????? 0 ? jstat -gc pid:可以顯示gc的信息，查看gc的次數，及時間。其中最后五項，分別是young gc的次數，young gc的時間，full gc的次數，full gc的時間，gc的總時間。 [xxxxxxxx ~]$ jstat -gc 12191
?S0C??? S1C??? S0U??? S1U????? EC?????? EU??????? OC???????? OU?????? PC???? PU??? YGC???? YGCT??? FGC??? FGCT???? GCT??
26176.0 26176.0? 0.0?? 26176.0 209792.0 75798.8? 1835008.0?? 72266.8?? 131072.0 60144.0????? 5??? 0.338?? 0????? 0.000??? 0.338 jstat -gccapacity:可以顯示，VM內存中三代（包括新生區，老年區，permanent區）對象的使用和占用大小，如：PGCMN顯示的是最小 perm的內存使用量，PGCMX顯示的是perm的內存最大使用量，PGC是當前新生成的perm內存占用量，PC是但前perm內存占用量。其他的可 以根據這個類推， OC是old內純的占用量。 [xxxxxxxx ~]$ jstat -gccapacity 12191
?NGCMN??? NGCMX???? NGC???? S0C?? S1C?????? EC????? OGCMN????? OGCMX?????? OGC???????? OC????? PGCMN??? PGCMX???? PGC?????? PC???? YGC??? FGC
262144.0 262144.0 262144.0 26176.0 26176.0 209792.0? 1835008.0? 1835008.0? 1835008.0? 1835008.0 131072.0 131072.0 131072.0 131072.0????? 5???? 0 jstat -gcnew pid:統計gc時，new新生代的情況 [xxxxxxxx ~]$ jstat -gcnew 12191
?S0C??? S1C??? S0U??? S1U?? TT MTT? DSS????? EC?????? EU???? YGC???? YGCT?
26176.0 26176.0??? 0.0 26176.0? 1?? 4 13088.0 209792.0? 76512.8????? 5??? 0.338 jstat -gcnewcapacity pid:new對象的信息及其占用量。 ? jstat -gcold pid:old對象的信息。 ? jstat -gcoldcapacity pid:old對象的信息及其占用量。 ? jstat -gcpermcapacity pid: perm對象的信息及其占用量。 ? jstat -printcompilation pid:當前VM執行的信息。除了以上一個參數外，還可以同時加上 兩個數字，如：jstat -printcompilation 3024 250 6是每250毫秒打印一次，一共打印6次，還可以加上-h3每三行顯示一下標題。 ? man jstat查看更詳細的吧
JSTACK 可以觀察到jvm中當前所有線程的運行情況和線程當前狀態 jstack pid 運行看看,內容很多只列出部分 [xxxxxxxx ~]$ jstack 12191
2009-12-24 18:45:19
Full thread dump Java HotSpot(TM) 64-Bit Server VM (11.0-b16 mixed mode): ? “Attach Listener” daemon prio=10 tid=0×0000000044a11c00 nid=0×4430 waiting on condition [0x0000000000000000..0x0000000000000000]
?? java.lang.Thread.State: RUNNABLE ? “http-0.0.0.0-7001-2″ daemon prio=10 tid=0×000000004546b000 nid=0×2fe5 in Object.wait() [0x00000000423af000..0x00000000423afc90]
?? java.lang.Thread.State: WAITING (on object monitor)
??????? at java.lang.Object.wait(Native Method)
??????? – waiting on <0×00002aaabc8700d8> (a org.apache.tomcat.util.net.MasterSlaveWorkerThread)
??????? at java.lang.Object.wait(Object.java:485)
??????? at org.apache.tomcat.util.net.MasterSlaveWorkerThread.await(MasterSlaveWorkerThread.java:81)
??????? – locked <0×00002aaabc8700d8> (a org.apache.tomcat.util.net.MasterSlaveWorkerThread)
??????? at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:107)
??????? at java.lang.Thread.run(Thread.java:619) ? “http-0.0.0.0-7001-1″ daemon prio=10 tid=0×0000000045469c00 nid=0×2fe4 in Object.wait() [0x000000004236e000..0x000000004236ec10]
?? java.lang.Thread.State: WAITING (on object monitor)
??????? at java.lang.Object.wait(Native Method)
??????? – waiting on <0×00002aaabcaef5d0> (a org.apache.tomcat.util.net.MasterSlaveWorkerThread)
??????? at java.lang.Object.wait(Object.java:485)
??????? at org.apache.tomcat.util.net.MasterSlaveWorkerThread.await(MasterSlaveWorkerThread.java:81)
??????? – locked <0×00002aaabcaef5d0> (a org.apache.tomcat.util.net.MasterSlaveWorkerThread)
??????? at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:107)
??????? at java.lang.Thread.run(Thread.java:619) ? “TP-Monitor” daemon prio=10 tid=0×00002aab406b0000 nid=0×2fe3 in Object.wait() [0x000000004232d000..0x000000004232db90]
?? java.lang.Thread.State: TIMED_WAITING (on object monitor)
??????? at java.lang.Object.wait(Native Method)
??????? at org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run(ThreadPool.java:559)
??????? – locked <0×00002aaabcd6ea98> (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
??????? at java.lang.Thread.run(Thread.java:619) ? “TP-Processor4″ daemon prio=10 tid=0×00002aab414f0800 nid=0×2fe2 runnable [0x00000000422ec000..0x00000000422ecb10]
?? java.lang.Thread.State: RUNNABLE
??????? at java.net.PlainSocketImpl.socketAccept(Native Method)
??????? at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
??????? – locked <0×00002aaabcfedfd8> (a java.net.SocksSocketImpl)
??????? at java.net.ServerSocket.implAccept(ServerSocket.java:453)
??????? at java.net.ServerSocket.accept(ServerSocket.java:421)
??????? at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:306)
??????? at org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:660)
??????? at org.apache.jk.common.ChannelSocket$SocketAcceptor.runIt(ChannelSocket.java:870)
??????? at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
??????? at java.lang.Thread.run(Thread.java:619) …………………………………………. …………………………………………… 等等。。。
JMAP 打印出某個java進程內存內所有對象的情況（產生的對象以及數量） jmap -histo pid 打印jvm heap的直方圖。其輸出信息包括類名，對象數量，對象占用大小。 內容會比較多 不方便查看可以將其保存到文本中去。（jmap -histo pid>histo.log） 該命令檢查內存泄漏 是很有用哦。 [xxxxxxxx ~]$ more histo.log ? ?num???? #instances???????? #bytes? class name
———————————————-
?? 1:??????? 251510?????? 39395232? [C
?? 2:???????? 53304?????? 37733944? [I
?? 3:???????? 90608?????? 12763752? <constMethodKlass>
?? 4:???????? 90608?????? 10883664? <methodKlass>
?? 5:??????? 256090?????? 10243600? java.lang.String
?? 6:????????? 8209??????? 9233040? <constantPoolKlass>
?? 7:???????? 74133??????? 9109848? [B
?? 8:??????? 129787??????? 6779512? <symbolKlass>
?? 9:????????? 8209??????? 6552912? <instanceKlassKlass>
? 10:??????? 111943??????? 6268808? java.util.HashMap$ValueIterator
? 11:???????? 94562??????? 6051968? java.util.TreeMap$Entry
? 12:????????? 7083??????? 5493440? <constantPoolCacheKlass>
? 13:??????? 109800??????? 5270400? org.apache.catalina.LifecycleEvent
? 14:???????? 28087??????? 5116800? [Ljava.lang.Object;
? 15:???????? 34532??????? 4681168? [Ljava.util.HashMap$Entry;
? 16:???????? 27458??????? 4173616? java.lang.reflect.Method
? 17:??????? 109800??????? 3498960? [Lorg.apache.catalina.Container;
? 18:???????? 66949??????? 3213552? java.util.HashMap$Entry
? 19:??????? 109970??????? 2771112? [Lorg.apache.catalina.LifecycleListener;
? 20:???????? 32831??????? 2101184? java.util.HashMap
? 21:???????? 34327??????? 1828320? [Ljava.lang.String;
? 22:???????? 21356??????? 1708480? java.util.TreeMap
? 23:????????? 8785??????? 1616440? java.lang.Class .................. .................. .................. jmap -dump:format=b,file=heap.log 12191可以將12191進程的內存heap輸出出來到heap.log 文件里。 jmap -heap pid（該命令我用的比較多） 打印出heap情況，可以觀察到New Generation（Eden Space，From Space，To Space）,tenured generation,Perm Generation的內存使用情況。 [xxxxxxxx ~]$ jmap -heap 12191
Attaching to process ID 12191, please wait…
Debugger attached successfully.
Server compiler detected.
JVM version is 11.0-b16 ? using parallel threads in the new generation.
using thread-local object allocation.
Concurrent Mark-Sweep GC ? Heap Configuration:
?? MinHeapFreeRatio = 40
?? MaxHeapFreeRatio = 70
?? MaxHeapSize????? = 2147483648 (2048.0MB)
?? NewSize????????? = 268435456 (256.0MB)
?? MaxNewSize?????? = 268435456 (256.0MB)
?? OldSize????????? = 805306368 (768.0MB)
?? NewRatio???????? = 7
?? SurvivorRatio??? = 8
?? PermSize???????? = 134217728 (128.0MB)
?? MaxPermSize????? = 134217728 (128.0MB) ? Heap Usage:
New Generation (Eden + 1 Survivor Space):
?? capacity = 241631232 (230.4375MB)
?? used???? = 94646792 (90.26221466064453MB)
?? free???? = 146984440 (140.17528533935547MB)
?? 39.16993313182296% used
Eden Space:
?? capacity = 214827008 (204.875MB)
?? used???? = 67842568 (64.69971466064453MB)
?? free???? = 146984440 (140.17528533935547MB)
?? 31.580092573835035% used
From Space:
?? capacity = 26804224 (25.5625MB)
?? used???? = 26804224 (25.5625MB)
?? free???? = 0 (0.0MB)
?? 100.0% used
To Space:
?? capacity = 26804224 (25.5625MB)
?? used???? = 0 (0.0MB)
?? free???? = 26804224 (25.5625MB)
?? 0.0% used
concurrent mark-sweep generation:
?? capacity = 1879048192 (1792.0MB)
?? used???? = 74001208 (70.57305145263672MB)
?? free???? = 1805046984 (1721.4269485473633MB)
?? 3.9382283176694597% used
Perm Generation:
?? capacity = 134217728 (128.0MB)
?? used???? = 61586560 (58.7335205078125MB)
?? free???? = 72631168 (69.2664794921875MB)
?? 45.885562896728516% used ? jmap -permstat pid 打印permanent generation heap情況 ? 更多信息查看man jmap ?? OPTIONS
????????? <no option>
???????????? 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:[live,]format=b,file=<filename>
???????????? Dumps? the? Java? heap? in hprof binary format to filename. The live suboption is optional. If specified,
???????????? only the live objects in the heap are dumped. To browse the heap dump, you can? use? jhat(1)? (Java? Heap
???????????? Analysis Tool) to read the generated file. ? ????????? -finalizerinfo
???????????? Prints information on objects awaiting finalization. ? ????????? -heap
???????????? Prints? a heap summary. GC algorithm used, heap configuration and generation wise heap usage are printed. ? ????????? -histo[:live]
???????????? 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. If the live sub-
???????????? option is specified, only live objects are counted. ? ????????? -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. In addition, the number and size of interned Strings are printed. ? ????????? -F Force. Use with jmap -dump or jmap -histo option if the pid does not respond. The live suboption? is? not
???????????? supported in this mode. ? ????????? -h Prints a help message. ? ????????? -help
???????????? Prints a help message. ? ????????? -J<flag>
???????????? Passes <flag> to the Java virtual machine on which jmap is run.
JCONSOLE 一個java GUI監視工具，可以以圖表化的形式顯示各種數據,并可通過遠程連接監視遠程的服務器VM。 個人喜歡稍微簡單易用jstat來查看。
轉載于:https://www.cnblogs.com/zhengah/p/4826441.html
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