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jthreadparser is a Go library to parse Java Thread Dump files.
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leogtzr/jthreadparser
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jthreadparser is a Go library to parse Java Thread Dump files.
threads,err:=jthreadparser.ParseFromFile(os.Args[1])iferr!=nil {log.Fatal(err)}for_,th:=rangethreads {fmt.Println(th.Name)fmt.Println(th.Priority)fmt.Println(th.NativeID)fmt.Println(th.State)fmt.Println(th.StackTrace)}
This code was brought to you byLeo Gutiérrez in his free time. If you want to thank me and support the development of this project, please make a small donation onPayPal. In case you also like my other open source contributions and articles, please consider motivating me by becoming a sponsor/patron onPatreon. Thank you! ❤️
Above code will help you to get this information from a thread dump file:
'Attach Listener' (0x00007f321c001000) (0x5ac6) [RUNNABLE]'DestroyJavaVM' (0x00007f32b4012000) (0x5934) [RUNNABLE]'scheduling-1' (0x00007f32b556c000) (0x596c) [TIMED_WAITING]'http-nio-8080-Acceptor' (0x00007f32b53d7000) (0x596b) [RUNNABLE]'http-nio-8080-ClientPoller' (0x00007f32b53f1000) (0x596a) [RUNNABLE]
To get information about which threads are waiting on what (synchronizer states) you can use theSynchronizersByThread() method:
threadDumpFile:="../../threaddumpsamples/13.0.2.0.txt"threads,err:=jthreadparser.ParseFromFile(threadDumpFile)iferr!=nil {panic(err)}syncs:=jthreadparser.SynchronizersByThread(&threads)forthread,threadSyncs:=rangesyncs {fmt.Printf("Thread [%s (%s)], synchronizers: %q\n",thread.Name,thread.ID,threadSyncs)}
...Thread [scheduling-1 (0x00007f494899a800)]{0x000000060dc31e60 java.lang.Class for com.thdump.calls.CallResult LockedState}{0x000000060dc31ed8 java.lang.Class for com.thdump.calls.Call9 LockedState}{0x000000060dc31f48 java.lang.Class for com.thdump.calls.Call8 LockedState}{0x000000060dc31fb8 java.lang.Class for com.thdump.calls.Call7 LockedState}{0x000000060dc32028 java.lang.Class for com.thdump.calls.Call6 LockedState}{0x000000060dc32098 java.lang.Class for com.thdump.calls.Call5LockedState}...Thread [http-nio-8080-exec-1 (0x00007f4948cd6000)]{0x000000060dc32098 java.lang.Class for com.thdump.calls.Call5WaitingToLockState}{0x000000062bac2040 java.lang.Class for com.thdump.calls.Call4 LockedState}{0x000000062babf8a8 java.lang.Class for com.thdump.calls.Call3 LockedState}{0x000000062babd110 java.lang.Class for com.thdump.calls.Call2 LockedState}{0x000000062baba978 java.lang.Class for com.thdump.calls.Call1LockedState}{0x000000060dc11ce0 org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper LockedState}...Thread [http-nio-8080-exec-2 (0x00007f494983e800)]{0x000000062baba978 java.lang.Class for com.thdump.calls.Call1WaitingToLockState}{0x000000062bb035b8 org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper LockedState}...You can read from standard input with theParseFrom(X):
threads,err:=jthreadparser.ParseFrom(os.Stdin)
jstack -l PID| go run myprogram.goYou can check how many threads include a specific Method using the MostUsedMethods() function:
threads,err:=jthreadparser.ParseFromFile("thread_dump.txt")...mostUsedMethods:=jthreadparser.MostUsedMethods(&threads)forjavaMethodName,threadCount:=rangemostUsedMethods {fmt.Printf("%d thread(s) having '%s'\n",threadCount,javaMethodName)}
Output:
...241 thread(s) having 'java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)'233 thread(s) having 'java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)'59 thread(s) having 'java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)'...threads,err:=jthreadparser.ParseFromFile("thread_dump.txt")...indenticalStackTrace:=jthreadparser.IdenticalStackTrace(&threads)forstackTrace,threadCount:=rangeindenticalStackTrace {fmt.Printf("%d threads having this stacktrace:\n",threadCount)fmt.Println(stackTrace)}
Output:
...20 threads having this stacktrace: at sun.misc.Unsafe.park(Native Method)- parking to wait for <0x000000074efc2310> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987)at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399)at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:957)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:917)at java.lang.Thread.run(Thread.java:682)1 threads having this stacktrace: at java.lang.Object.wait(Native Method)- waiting on <0x000000075c8e5d40> (a atg.service.datacollection.DataCollectorQueue)at java.lang.Object.wait(Object.java:485)at atg.service.queue.EventQueue.getElement(EventQueue.java:236)- locked <0x000000075c8e5d40> (a atg.service.datacollection.DataCollectorQueue)at atg.service.queue.EventQueue.dispatchQueueElements(EventQueue.java:285)at atg.service.queue.EventQueue$Handler.run(EventQueue.java:91)1 threads having this stacktrace: at java.lang.Object.wait(Native Method)...About
jthreadparser is a Go library to parse Java Thread Dump files.
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