Is it possible to find the creation time of a thread using thread dump?

Question

I use jmap -dump:format=b,file=<file.dump> <PID> command to generate thread dump of a JVM instance. I just want to know if it's possible to find the time of creation of a thread running in the JVM instance, using the thread dump generated.

score 4 · Accepted Answer · answered Jun 02 '17 at 15:03

This is a heap dump, not a thread dump. There is no info about thread creation time in a heap dump. However, you can find it from a thread dump as described below.

Dump threads using jstack <PID>

Find nid of the thread you are interested in:

"Thread-7" #30 daemon prio=5 os_prio=0 tid=0x00002aaac9688800 nid=0x6945 runnable [0x00000000429c5000]
                                                                  ^^^^^^
   java.lang.Thread.State: RUNNABLE
        at sun.nio.ch.EPoll.epollWait(Native Method)
        at sun.nio.ch.EPollPort$EventHandlerTask.poll(EPollPort.java:194)
        at sun.nio.ch.EPollPort$EventHandlerTask.run(EPollPort.java:268)
        at java.lang.Thread.run(Thread.java:745)

Convert it to decimal: TID = 0x6945 = 26949
Get the start time using ps -Lo tid,lstart <PID> | grep <TID>
```
26949 Tue May 30 19:16:29 2017
```

Is it possible to find the creation time of a thread using thread dump?

1 Answers1