what's this file in java? core.26416, heap dump or thread dump?

Question

core.26416 ,what's this file in java? which tool can anaylst it? what's the extension for java thread dump , heap dump and core? what's the difference between thread dump/heap dump and core dump?

Answer 1

Exactly what is core.26416 file i do not know, but Thread Dump basically helps to track a activity of each thread.What are the job/task each thread is doing at a perticular point of time we can get by thread dump.

To Create a thread dump in console Press Ctrl+Pause Break from Key board.

Create a java program for infinite loop , at the time of running press Ctrl+Pause Break key from key board and see the Full Thread dump is printed on console ( Now write that into a file).

Program :- xLoop.java

public class xLoop{ public static void main(String str[]){ boolean x=true; while(x){ System.out.println("Hello Manoj "); } } }

Heap Dump

But, Heap dump is used to find memory leak.Thread dump may not give 100% of result for finding memory leak, so you can use heap dump for achieve this.Heap dump is essential for heap size,perm size and some other setups.

There are many tools like jhat is a heap analysis tool or you can use visualgc,jmap are very popular tools for heap dump.