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有哪些常用性能分析命令与工具

发布时间：2021-10-23 17:20:24 来源：亿速云 阅读：458 作者：iii 栏目：编程语言

本篇内容介绍了“有哪些常用性能分析命令与工具”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

常用命令

  1. jstack

    1. 查看：/usr/bin/jstack -l 11400

    2. 导出：/usr/bin/jstack 11400 > thread.txt

    3. 统计：/usr/bin/jstack -l 11400 | grep 'Apollo-RemoteConfigRepository-1' | wc -l

    4. 查看cpu占用高进程：

    5. 输出：1

    6. 输出：
      "SimplePauseDetectorThread_0" #78 daemon prio=9 os_prio=0 tid=0x00007f664c07c800 nid=0x2efd sleeping[0x00007f662aa37000]
      java.lang.Thread.State: TIMED_WAITING (sleeping)
      at java.lang.Thread.sleep(Native Method)
      at java.lang.Thread.sleep(Thread.java:340)
      at java.util.concurrent.TimeUnit.sleep(TimeUnit.java:386)
      at org.LatencyUtils.TimeServices.sleepNanos(TimeServices.java:62)
      at org.LatencyUtils.SimplePauseDetector$SimplePauseDetectorThread.run(SimplePauseDetector.java:116)

      "Thread-32" #77 daemon prio=9 os_prio=0 tid=0x00007f664c074800 nid=0x2efc waiting on condition [0x00007f662aa78000]
      java.lang.Thread.State: WAITING (parking)
      at sun.misc.Unsafe.park(Native Method)
      - parking to wait for <0x00000000ed80df78> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
      at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
      at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
      at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
      at org.LatencyUtils.PauseDetector$PauseDetectorThread.run(PauseDetector.java:85)

      "RxIoScheduler-1 (Evictor)" #76 daemon prio=5 os_prio=0 tid=0x00007f66a8735800 nid=0x2eed waiting on condition [0x00007f662acb9000]
      java.lang.Thread.State: TIMED_WAITING (parking)
      at sun.misc.Unsafe.park(Native Method)
      - parking to wait for <0x00000000ed51a578> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
      at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
      at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
      at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at java.lang.Thread.run(Thread.java:745)

      "Connection evictor" #75 daemon prio=5 os_prio=0 tid=0x00007f66a8659000 nid=0x2eec waiting on condition [0x00007f662acfa000]

    7. 2efd

    8. 输出：PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
      12029 root 20 0 4396512 813692 8668 S 6.2 10.2 0:05.74 java
      12527 root 20 0 4396512 813692 8668 S 6.2 10.2 0:41.19 java

    9. top -H -p 11400

    10. printf '%x\n' 12029

    11. jstack 11400 | grep 2efd -A 30

    12. jstack

      Usage:
    jstack [-l] <pid>
        (to connect to running process)
    jstack -F [-m] [-l] <pid>
        (to connect to a hung process)
    jstack [-m] [-l] <executable> <core>
        (to connect to a core file)
    jstack [-m] [-l] [server_id@]<remote server IP or hostname>
        (to connect to a remote debug server)

Options:
    -F  to force a thread dump. Use when jstack <pid> does not respond (process is hung)
    -m  to print both java and native frames (mixed mode)
    -l  long listing. Prints additional information about locks
    -h or -help to print this help message

      值得关注的线程状态有：

    13. 死锁，Deadlock（重点关注） 

    14. 执行中，Runnable   

    15. 等待资源，Waiting on condition（重点关注） 

    16. 等待获取监视器，Waiting on monitor entry（重点关注）

    17. 暂停，Suspended

    18. 对象等待中，Object.wait() 或 TIMED_WAITING

    19. 阻塞，Blocked（重点关注）  

    20. 停止，Parked

    21. jstack能得到运行java程序的java stack和native stack的信息。可以轻松得知当前线程的运行情况。

    22. 用途

    23. 命令参数

    24. 用法

  2. jmap

    1. 查看进程的内存映像信息：jmap 11400

    2. 显示Java堆详细信息：jmap -heap 11400

    3. 显示堆中对象的统计信息：/usr/bin/jmap -histo:live 11400 | head -20

    4. 生成堆转储快照dump文件： jmap -dump:live,format=b,file=/tmp/heap.hprof 11400

    5. 输出：Attaching to process ID 11400, please wait...
      Debugger attached successfully.
      Server compiler detected.
      JVM version is 25.121-b13
      0x0000000000400000 7K /usr/java/jdk1.8.0_121/jre/bin/java
      0x00007f664832e000 250K /usr/java/jdk1.8.0_121/jre/lib/amd64/libsunec.so
      0x00007f6684bfe000 66K /usr/lib64/libbz2.so.1.0.6
      0x00007f6684e0e000 153K /usr/lib64/liblzma.so.5.2.2
      0x00007f6685034000 88K /usr/lib64/libz.so.1.2.7
      0x00007f668524a000 97K /usr/lib64/libelf-0.166.so
      0x00007f6685462000 19K /usr/lib64/libattr.so.1.1.0
      0x00007f6685667000 86K /usr/lib64/libgcc_s-4.8.5-20150702.so.1
      0x00007f668587d000 294K /usr/lib64/libdw-0.166.so
      0x00007f6685ac5000 19K /usr/lib64/libcap.so.2.22
      0x00007f6685cca000 107K /usr/lib64/libresolv-2.17.so
      0x00007f6685ee4000 30K /usr/lib64/libnss_dns-2.17.so
      0x00007f66862eb000 90K /usr/java/jdk1.8.0_121/jre/lib/amd64/libnio.so
      0x00007f6687be0000 113K /usr/java/jdk1.8.0_121/jre/lib/amd64/libnet.so
      0x00007f6687df7000 49K /usr/java/jdk1.8.0_121/jre/lib/amd64/libmanagement.so
      0x00007f66c8000000 64K /usr/lib64/libnss_myhostname.so.2
      0x00007f66c9bc1000 121K /usr/java/jdk1.8.0_121/jre/lib/amd64/libzip.so
      0x00007f66c9ddc000 60K /usr/lib64/libnss_files-2.17.so
      0x00007f66c9fef000 48K /usr/java/jdk1.8.0_121/jre/lib/amd64/libinstrument.so
      0x00007f66ca1f9000 220K /usr/java/jdk1.8.0_121/jre/lib/amd64/libjava.so
      0x00007f66ca425000 64K /usr/java/jdk1.8.0_121/jre/lib/amd64/libverify.so
      0x00007f66ca633000 42K /usr/lib64/librt-2.17.so
      0x00007f66ca83b000 1110K /usr/lib64/libm-2.17.so
      0x00007f66cab3d000 16591K /usr/java/jdk1.8.0_121/jre/lib/amd64/server/libjvm.so
      0x00007f66cbb2f000 2105K /usr/lib64/libc-2.17.so
      0x00007f66cbefd000 18K /usr/lib64/libdl-2.17.so
      0x00007f66cc101000 99K /usr/java/jdk1.8.0_121/jre/lib/amd64/jli/libjli.so
      0x00007f66cc317000 138K /usr/lib64/libpthread-2.17.so
      0x00007f66cc533000 159K /usr/lib64/ld-2.17.so

    6. 输出：Attaching to process ID 11400, please wait...
      Debugger attached successfully.
      Server compiler detected.
      JVM version is 25.121-b13

      using parallel threads in the new generation.
      using thread-local object allocation.
      Concurrent Mark-Sweep GC

      Heap Configuration:
      MinHeapFreeRatio = 40
      MaxHeapFreeRatio = 70
      MaxHeapSize = 536870912 (512.0MB)
      NewSize = 134217728 (128.0MB)
      MaxNewSize = 134217728 (128.0MB)
      OldSize = 402653184 (384.0MB)
      NewRatio = 2
      SurvivorRatio = 8
      MetaspaceSize = 21807104 (20.796875MB)
      CompressedClassSpaceSize = 1073741824 (1024.0MB)
      MaxMetaspaceSize = 268435456 (256.0MB)
      G1HeapRegionSize = 0 (0.0MB)

      Heap Usage:
      New Generation (Eden + 1 Survivor Space):
      capacity = 120848384 (115.25MB)
      used = 66229472 (63.161346435546875MB)
      free = 54618912 (52.088653564453125MB)
      54.80377131066974% used
      Eden Space:
      capacity = 107479040 (102.5MB)
      used = 63536296 (60.592933654785156MB)
      free = 43942744 (41.907066345214844MB)
      59.11505722418064% used
      From Space:
      capacity = 13369344 (12.75MB)
      used = 2693176 (2.5684127807617188MB)
      free = 10676168 (10.181587219238281MB)
      20.144413966758577% used
      To Space:
      capacity = 13369344 (12.75MB)
      used = 0 (0.0MB)
      free = 13369344 (12.75MB)
      0.0% used
      concurrent mark-sweep generation:
      capacity = 402653184 (384.0MB)
      used = 176729160 (168.54206085205078MB)
      free = 225924024 (215.45793914794922MB)
      43.89116168022156% used

    7. 输出：

      num #instances #bytes class name
      ----------------------------------------------
      1: 273268 29359760 [C
      2: 337511 10800352 java.util.concurrent.ConcurrentHashMap$Node
      3: 217704 10449792 org.aspectj.weaver.reflect.ShadowMatchImpl
      4: 116214 10226832 java.lang.reflect.Method
      5: 217712 6966784 org.aspectj.weaver.patterns.ExposedState
      6: 69225 6647552 [Ljava.lang.Object;
      7: 271133 6507192 java.lang.String
      8: 12598 6112856 [B
      9: 1479 3026296 [Ljava.util.concurrent.ConcurrentHashMap$Node;
      10: 50114 2806384 java.util.LinkedHashMap
      11: 24799 2751976 java.lang.Class
      12: 66869 2674760 java.util.LinkedHashMap$Entry
      13: 34280 2507280 [Ljava.util.HashMap$Node;
      14: 11273 2043680 [I
      15: 78910 1932576 [Z
      16: 60015 1920480 java.util.HashMap$Node
      17: 78497 1883920 [Lorg.aspectj.weaver.ast.Var;

    8. 输出：Dumping heap to /tmp/heap.hprof ...
      Heap dump file created

    9. jmap

      Usage:              

           jmap [option] <pid>              

               (to connect to running process)              

           jmap [option] <executable <core>              

               (to connect to a core file)              

           jmap [option] [server_id@]<remote server IP or hostname>              

               (to connect to remote debug server)              

       

      where <option> is one of:              

           <none>               to print same info as Solaris pmap              

           -heap                to print java heap summary              

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

                                suboption is specified, only count live objects              

           -clstats             to print  class   loader statistics              

           -finalizerinfo       to print information on objects awaiting finalization              

           -dump:<dump-options> 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=<file>  dump heap to <file>              

                                Example: jmap -dump:live,format=b,file=heap.bin <pid>              

           -F                   force. Use with -dump:<dump-options> <pid> or -histo              

                                to force a heap dump or histogram when <pid> does not              

                                respond. The  "live"   suboption is not supported              

                                in  this   mode.              

           -h | -help           to print  this   help message              

           -J<flag>             to pass <flag> directly to the runtime system              

    10. 得到运行java程序的内存分配的详细情况，可以生成 java 程序的 dump 文件, 也可以查看堆内对象示例的统计信息、查看 ClassLoader 的信息以及 finalizer 队列。

    11. 用途

    12. 命令参数

    13. 用法

  3. jstat

    1. 查看垃圾回收：jstat -gcutil 11400 1000 5

    2. O：老年代使用比例

    3. M：元数据区使用比例

    4. CCS：压缩使用比例

    5. YGC：年轻代垃圾回收次数

    6. FGCT：老年代垃圾回收消耗时间（单位：s秒）

    7. GCT：垃圾回收消耗总时间（单位：s秒）

    8. 输出：
      S0 S1 E O M CCS YGC YGCT FGC FGCT GCT
      0.00 16.15 33.06 35.11 94.91 92.76 507 11.471 10 2.549 14.019
      0.00 16.15 34.19 35.11 94.91 92.76 507 11.471 10 2.549 14.019
      0.00 16.15 34.30 35.11 94.91 92.76 507 11.471 10 2.549 14.019
      0.00 16.15 34.51 35.11 94.91 92.76 507 11.471 10 2.549 14.019
      0.00 16.15 35.63 35.11 94.91 92.76 507 11.471 10 2.549 14.019

    9. jstat

      Usage: jstat -help|-options              

              jstat -<option> [-t] [-h<lines>] <vmid> [<interval> [<count>]]              

       

      Definitions:              

         <option>      An option reported by the -options option              

         <vmid>        Virtual Machine Identifier. A vmid takes the following form:              

                            <lvmid>[@<hostname>[:<port>]]              

                       Where <lvmid> is the local vm identifier  for   the target              

                       Java virtual machine, typically a process id; <hostname> is              

                       the name of the host running the target Java virtual machine;              

                       and <port> is the port number  for   the rmiregistry on the              

                       target host. See the jvmstat documentation  for   a more complete              

                       description of the Virtual Machine Identifier.              

         <lines>       Number of samples between header lines.              

         <interval>    Sampling interval. The following forms are allowed:              

                           <n>[ "ms" | "s" ]              

                       Where <n> is an integer and the suffix specifies the units as              

                       milliseconds( "ms" ) or seconds( "s" ). The  default   units are  "ms" .              

         <count>       Number of samples to take before terminating.              

         -J<flag>      Pass <flag> directly to the runtime system.              

    10. 监视虚拟机各种运行状态信息的命令行工具，查看堆内存各部分的使用量,以及加载类的数量

    11. 用途

    12. 命令参数

    13. 用法

  4. netstat

    1. 显示网卡列表：netstat -i

    2. 显示网络统计：netstat -lntup

    3. 统计机器中网络连接各个状态个数：netstat -anc | grep 9092

    4. 找出程序运行的端口：netstat -ap | grep 11400

    5. 输出：
      Kernel Interface table
      Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
      eth0 1500 127092481 0 2325462 0 90637447 0 0 0 BMRU
      lo 65536 275564 0 0 0 275564 0 0 0 LRU

    6. 输出：
      Active Internet connections (only servers)
      Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
      tcp 0 0 0.0.0.0:9039 0.0.0.0:* LISTEN 11400/java
      tcp 0 0 0.0.0.0:9999 0.0.0.0:* LISTEN 11400/java
      tcp 0 0 0.0.0.0:9071 0.0.0.0:* LISTEN 15250/java
      tcp 0 0 0.0.0.0:9072 0.0.0.0:* LISTEN 4078/java
      tcp 0 0 0.0.0.0:9073 0.0.0.0:* LISTEN 4586/java
      tcp 0 0 0.0.0.0:50001 0.0.0.0:* LISTEN 4586/java
      tcp 0 0 0.0.0.0:9078 0.0.0.0:* LISTEN 13131/java
      tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 815/sshd
      tcp 0 0 0.0.0.0:8087 0.0.0.0:* LISTEN 28760/java
      tcp 0 0 0.0.0.0:10072 0.0.0.0:* LISTEN 4078/java
      tcp 0 0 0.0.0.0:7071 0.0.0.0:* LISTEN 1453/java
      tcp 0 0 0.0.0.0:7072 0.0.0.0:* LISTEN 32059/java
      tcp 0 0 0.0.0.0:9088 0.0.0.0:* LISTEN 24501/java
      tcp 0 0 0.0.0.0:10050 0.0.0.0:* LISTEN 795/zabbix_agentd
      tcp 0 0 0.0.0.0:16869 0.0.0.0:* LISTEN 1453/java
      tcp6 0 0 :::22 :::* LISTEN 815/sshd
      tcp6 0 0 :::10050 :::* LISTEN 795/zabbix_agentd
      udp 0 0 127.0.0.1:323 0.0.0.0:* 499/chronyd
      udp6 0 0 ::1:323 :::* 499/chronyd

    7. 输出：
      tcp 0 0 172.16.20.142:40464 172.16.20.60:9092 ESTABLISHED
      tcp 0 0 172.16.20.142:52536 172.16.20.60:9092 ESTABLISHED
      tcp 0 0 172.16.20.142:58202 172.16.20.60:9092 ESTABLISHED
      tcp 0 0 172.16.20.142:41314 172.16.20.60:9092 ESTABLISHED
      tcp 0 0 172.16.20.142:40826 172.16.20.60:9092 ESTABLISHED
      tcp 0 0 172.16.20.142:41150 172.16.20.60:9092 ESTABLISHED
      tcp 0 0 172.16.20.142:54978 172.16.20.60:9092 ESTABLISHED

    8. 输出：
      tcp 0 0 0.0.0.0:9039 0.0.0.0:* LISTEN 11400/java
      tcp 0 0 0.0.0.0:distinct 0.0.0.0:* LISTEN 11400/java
      tcp 0 0 ext-spring-md-sho:55364 work-arch-lb-1:6379 ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:54114 db-work-01:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:45768 172.16.20.1:amqp ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:49960 172.16.20.1:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:49932 172.16.20.1:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:49954 172.16.20.1:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:47498 172.16.20.38:eforward ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:49946 172.16.20.1:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:49970 172.16.20.1:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:54616 st-arch-polari:webcache ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:49964 172.16.20.1:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:49968 172.16.20.1:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:54144 db-work-01:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:54112 db-work-01:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:54096 db-work-01:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:40826 172.16.20.:XmlIpcRegSvc ESTABLISHED 11400/java
      tcp 1 0 ext-spring-md-sho:41072 172.16.20.168:mysql CLOSE_WAIT 11400/java
      tcp 0 0 ext-spring-md-sho:49956 172.16.20.1:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:49966 172.16.20.1:ms-sql-s ESTABLISHED 11400/java
      tcp 0 0 ext-spring-md-sho:54098 db-work-01:ms-sql-s ESTABLISHED 11400/java  

    9. netstat

      usage: netstat [-vWeenNcCF] [<Af>] -r         netstat {-V|--version|-h|--help}              

              netstat [-vWnNcaeol] [<Socket> ...]              

              netstat { [-vWeenNac] -I[<Iface>] | [-veenNac] -i | [-cnNe] -M | -s [-6tuw] } [delay]              

       

               -r, --route              display routing table              

               -I, --interfaces=<Iface> display  interface   table  for   <Iface>              

               -i, --interfaces         display  interface   table              

               -g, --groups             display multicast group memberships              

               -s, --statistics         display networking statistics (like SNMP)              

               -M, --masquerade         display masqueraded connections              

       

               -v, --verbose            be verbose              

               -W, --wide               don't truncate IP addresses              

               -n, --numeric            don't resolve names              

               --numeric-hosts          don't resolve host names              

               --numeric-ports          don't resolve port names              

               --numeric-users          don't resolve user names              

               -N, --symbolic           resolve hardware names              

               -e, --extend             display other/more information              

               -p, --programs           display PID/Program name  for   sockets              

               -o, --timers             display timers              

               -c, --continuous         continuous listing              

       

               -l, --listening          display listening server sockets              

               -a, --all                display all sockets ( default : connected)              

               -F, --fib                display Forwarding Information Base ( default )              

               -C, --cache              display routing cache instead of FIB              

               -Z, --context            display SELinux security context  for   sockets              

       

         <Socket>={-t|--tcp} {-u|--udp} {-U|--udplite} {-S|--sctp} {-w|--raw}              

                  {-x|--unix} --ax25 --ipx --netrom              

         <AF>=Use  '-6|-4'   or  '-A <af>'   or  '--<af>' ;  default : inet              

         List of possible address families (which support routing):              

           inet (DARPA Internet) inet6 (IPv6) ax25 (AMPR AX. 25 )              

           netrom (AMPR NET/ROM) ipx (Novell IPX) ddp (Appletalk DDP)              

           x25 (CCITT X. 25 )              

    10. 用于显示与IP、TCP、UDP和ICMP协议相关的统计数据，一般用于检验本机各端口的网络连接情况

    11. 用途

    12. 命令参数

    13. 用法

常用工具

  1. jconsole

    1. 有哪些常用性能分析命令与工具

    2. 有哪些常用性能分析命令与工具

    3. 应用启动参数：-Djava.rmi.server.hostname=xxxxx -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=12345

    4. 点击JDK/bin 目录下面的jconsole.exe 即可启动

    5. 有哪些常用性能分析命令与工具

    6. 启动使用

    7. 查看内存

    8. 查看线程

  2. MAT

    1. 通过图型列出最大的Object

    2. 有哪些常用性能分析命令与工具

    3. 列出线程的树结构，及线程下面对象占用内存的空间

    4. 有哪些常用性能分析命令与工具

    5. 自动分析内存内存泄漏的原因，可以直接定位到Class，且行数

    6. 有哪些常用性能分析命令与工具

    7. 有哪些常用性能分析命令与工具

    8. 有哪些常用性能分析命令与工具

    9. 有哪些常用性能分析命令与工具

    10. Class Name ： 类名称，java类名

    11. Objects ： 类的对象的数量，这个对象被创建了多少个

    12. Shallow Heap ：一个对象内存的消耗大小，不包含对其他对象的引用

    13. Retained Heap ：是shallow Heap的总和，也就是该对象被GC之后所能回收到内存的总和

    14. 有哪些常用性能分析命令与工具

    15. 打开dump文件

    16. Histogram

    17. 在某一项上右键打开菜单选择 list objects ->with incoming refs 将列出该类的实例

    18. 快速找出某个实例没被释放的原因，可以右健 Path to GC Roots–>exclue all phantom/weak/soft etc. reference :

    19. Leak Suspects

    20. Dominator Tree

    21. Top Comsumers

jprofile

  1. 启动使用

    1. 在被分析的jvm 的启动参数增加下面内容：-agentpath:/opt/jprofiler11/bin/linux-x64/libjprofilerti.so=port=8849

    2. 点击jprofiler.exe
      执行菜单Session–Integr ation Wizards–New Server Integration
      选择JDK
      选择Web容器是否和Jprofiler一起运行
      有哪些常用性能分析命令与工具

    3.     输入服务器地址，在服务器上执行jpenable

    4.      /usr/local/bin/jpenable

    5.      Select a JVM:
            ext-service-md-car-check-analysis.jar [10125] [1]

    6.       Please select the profiling mode:
            GUI mode (attach with JProfiler GUI) [1, Enter]
            Offline mode (use config file to set profiling settings) [2]
            Please enter a profiling port
            [45763]
            8849
            You can now use the JProfiler GUI to connect on port 8849
        有哪些常用性能分析命令与工具

    7.     选择安装目录

    8.   有哪些常用性能分析命令与工具

    9.     端口号指定

    10.   有哪些常用性能分析命令与工具

  2. 使用分析

    1. 有哪些常用性能分析命令与工具

    2. 有哪些常用性能分析命令与工具

    3. 有哪些常用性能分析命令与工具

    4. 接入

    5. overview:

    6. cpu views：可录像回放

show-busy-java-threads

  1. 使用文档

    1. https://github.com/oldratlee/useful-scripts/blob/master/docs/java.md#-show-busy-java-threads

arthas

  1. 使用文档

    1. https://arthas.aliyun.com/doc/

jvisualvm

  1. 使用文档

    1. https://docs.oracle.com/javase/8/docs/technotes/guides/visualvm/index.html

JFR(飞行器)

  1. 使用方法

    1. 创建一个包含了你自己配置的JFR模板文件。运行jmc, 然后Window->Flight Recording Template Manage菜单。准备好档案后，就可以导出文件，并移动到要排查问题的环境中。

    2. 有哪些常用性能分析命令与工具

    3. 一分钟后可查看记录数据，通过这些数据，可以清楚的了解到这一分钟时间内，整个

    4. 有哪些常用性能分析命令与工具

    5. 有哪些常用性能分析命令与工具

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