[java] Difference between javacore, thread dump and heap dump in Websphere

A thread dump is a dump of the stacks of all live threads. Thus useful for analysing what an app is up to at some point in time, and if done at intervals handy in diagnosing some kinds of 'execution' problems (e.g. thread deadlock).

A heap dump is a dump of the state of the Java heap memory. Thus useful for analysing what use of memory an app is making at some point in time so handy in diagnosing some memory issues, and if done at intervals handy in diagnosing memory leaks.

This is what they are in 'raw' terms, and could be provided in many ways. In general used to describe dumped files from JVMs and app servers, and in this form they are a low level tool. Useful if for some reason you can't get anything else, but you will find life easier using decent profiling tool to get similar but easier to dissect info.

With respect to WebSphere a javacore file is a thread dump, albeit with a lot of other info such as locks and loaded classes and some limited memory usage info, and a PHD file is a heap dump.

If you want to read a javacore file you can do so by hand, but there is an IBM tool (BM Thread and Monitor Dump Analyzer) which makes it simpler. If you want to read a heap dump file you need one of many IBM tools: MDD4J or Heap Analyzer.

Examples related to java

Under what circumstances can I call findViewById with an Options Menu / Action Bar item? How much should a function trust another function How to implement a simple scenario the OO way Two constructors How do I get some variable from another class in Java? this in equals method How to split a string in two and store it in a field How to do perspective fixing? String index out of range: 4 My eclipse won't open, i download the bundle pack it keeps saying error log

Examples related to multithreading

How can compare-and-swap be used for a wait-free mutual exclusion for any shared data structure? Waiting until the task finishes What is the difference between Task.Run() and Task.Factory.StartNew() Why is setState in reactjs Async instead of Sync? What exactly is std::atomic? Calling async method on button click WAITING at sun.misc.Unsafe.park(Native Method) How to use background thread in swift? What is the use of static synchronized method in java? Locking pattern for proper use of .NET MemoryCache

Examples related to websphere

JSTL if tag for equal strings Debugging Spring configuration SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder" How do I connect to a Websphere Datasource with a given JNDI name? Difference between javacore, thread dump and heap dump in Websphere Are SSL certificates bound to the servers ip address? (SC) DeleteService FAILED 1072

Examples related to heap

Android Gradle Could not reserve enough space for object heap How to increase application heap size in Eclipse? Increase JVM max heap size for Eclipse Command-line Tool to find Java Heap Size and Memory Used (Linux)? how to increase java heap memory permanently? Finding the median of an unsorted array Find running median from a stream of integers Object creation on the stack/heap? How can building a heap be O(n) time complexity? Why should C++ programmers minimize use of 'new'?

Examples related to dump

Python JSON dump / append to .txt with each variable on new line Save Screen (program) output to a file How to restore PostgreSQL dump file into Postgres databases? Dump Mongo Collection into JSON format How can I convert an MDB (Access) file to MySQL (or plain SQL file)? kill -3 to get java thread dump Difference between javacore, thread dump and heap dump in Websphere What is the JavaScript equivalent of var_dump or print_r in PHP? List of tables, db schema, dump etc using the Python sqlite3 API Convert a string representation of a hex dump to a byte array using Java?