HI Gabriel,

The link to the thread you posted above does not work for me, I got an error going there. Is there any other place where I can also check about this topic ?

Thks!

• Thread dump: https://www.ibm.com/docs/en/sdk-java-technology/8?topic=dumps-java-dump
• Heap dump: https://www.ibm.com/docs/en/sdk-java-technology/8?topic=dumps-heap-dump
• Core dump: https://www.ibm.com/docs/en/sdk-java-technology/8?topic=dumps-system-dump

A thread dump is a lightweight text file that has all thread stacks and other useful information. It pauses the JVM for up to about a few hundred milliseconds and it's usually a few MB. It's the main diagnostic to starting investigating hangs, high CPU, and performance issues. There is a free tool called TMDA to analyze thread dumps visually: https://www.ibm.com/support/pages/ibm-thread-and-monitor-dump-analyzer-java-tmda

Heapdumps and core dumps are used to investigate OutOfMemoryErrors and to tune heap usage. A core dump is a superset of a heapdump: whereas a heapdump only has object sizes and relationships, a core dump has that plus more accurate reasons why objects are alive and full memory contents. There is a free tool called Eclipse Memory Analyzer Tool to analyze both dumps and there is a special download that can read IBM/Semeru dumps: https://www.ibm.com/support/pages/eclipse-memory-analyzer-tool-dtfj-and-ibm-extensions