JVM相关信息查看 JVM相关信息查看

1. jps，查看jvm实例

[root@test_back-1~]# jps -help usage: jps [-help] jps [-q] [-mlvV] []Definitions: :[:] [root@test_back-1~]# jps -q 30262 28666 20794 30109 [root@test_back-1~]# jps -m 20806 Jps -m 30262 Bootstrap start 28666 jar 30109 Bootstrap start

2. jstat，jvm统计信息，包含内存信息及GC信息

[root@test_back-1~]# jstat -help Usage: jstat -help|-options jstat -

3. jmap，查看JVM内存相关信息

[root@test_back-1~]# jmap -help Usage: jmap [option] (to connect to running process) jmap [option] (to connect to a core file) jmap [option] [server_id@] (to connect to remote debug server)where

4. jstack，查看java栈及本地方法栈信息

[root@test_back-1~]# jstack -help Usage: jstack [-l] (to connect to running process) jstack -F [-m] [-l] (to connect to a hung process) jstack [-m] [-l] (to connect to a core file) jstack [-m] [-l] [server_id@] (to connect to a remote debug server)Options: -Fto force a thread dump. Use when jstack does not respond (process is hung) -mto print both java and native frames (mixed mode) -llong listing. Prints additional information about locks -h or -help to print this help message [root@test_back-1~]# jstack -l 30109 "Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007f1e80120000 nid=0x75a5 in Object.wait() [0x00007f1e84a61000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference.tryHandlePending(Reference.java:191) - locked <0x00000000ca967f48> (a java.lang.ref.Reference$Lock) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)Locked ownable synchronizers: - None"main" #1 prio=5 os_prio=0 tid=0x00007f1e8000a000 nid=0x759f runnable [0x00007f1e87d70000] 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:743) at org.apache.catalina.startup.Catalina.start(Catalina.java:689) 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)Locked ownable synchronizers: - None"VM Thread" os_prio=0 tid=0x00007f1e80118800 nid=0x75a4 runnable "Gang worker#0 (Parallel GC Threads)" os_prio=0 tid=0x00007f1e8001b000 nid=0x75a0 runnable "Gang worker#1 (Parallel GC Threads)" os_prio=0 tid=0x00007f1e8001c800 nid=0x75a1 runnable "Concurrent Mark-Sweep GC Thread" os_prio=0 tid=0x00007f1e8004a000 nid=0x75a2 runnable "VM Periodic Task Thread" os_prio=0 tid=0x00007f1e80756000 nid=0x75b6 waiting on condition JNI global references: 689

5. jinfo，查看jvm配置信息

[root@test_back-1~]# jinfo -help Usage: jinfo [option] (to connect to running process) jinfo [option] (to connect to a core file) jinfo [option] [server_id@] (to connect to remote debug server)where

示例：查看指定进程栈信息

[root@test_back-1 ~]# top -Hp 30109#查看这个JVM进程里面的进程运行情况 top - 15:01:01 up 123 days,8:43,3 users,load average: 0.20, 0.13, 0.05 Tasks: 246 total,0 running, 246 sleeping,0 stopped,0 zombie Cpu(s):1.5%us,0.7%sy,0.0%ni, 97.0%id,0.8%wa,0.0%hi,0.0%si,0.0%st Mem:3924700k total,3654884k used,269816k free,160024k buffers Swap:3989496k total,120700k used,3868796k free,1181444k cached Unknown command - try 'h' for help PID USERPRNIVIRTRESSHR S %CPU %MEMTIME+COMMAND 30126 root200 3980m 762m15m S0.7 19.90:59.70 java ... [root@test_back-1 ~]# printf "%x \n" 30126#转换进程id为16进制 75ae [root@test_back-1 ~]# jstack 30109|grep 75ae --color -C 5#查看进程里面的栈信息 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)"DataCarrier.DEFAULT.Consumser.0.Thread" #10 daemon prio=5 os_prio=0 tid=0x00007f1e8070f000 nid=0x75ae sleeping[0x00007f1e84295000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.apache.skywalking.apm.commons.datacarrier.consumer.ConsumerThread.run(ConsumerThread.java:72)"Thread-3" #9 daemon prio=5 os_prio=0 tid=0x00007f1e8026e000 nid=0x75aa waiting on condition [0x00007f1e84413000]

【JVM相关信息查看】每一个使用之前都下查看帮助信息（-help）