Thread dump analysis is a traditional approach followed to analyze the performance bottlenecks in Java-based applications. In the modern era, we have APM tools that provide various metrics and screens to drill down and identify performance issues, even at the code level. But for some of the performance issues or occasions, thread dump analysis still stands as the best way to identify the bottlenecks.
When To Use a Thread Dump
To analyze any performance issue, it is good to take a series of thread dumps with a 1 to 2-second time gap. Taking 10-15 thread dumps each with 1-2 second intervals helps to analyze the threads that got stuck or execute the same code across thread dumps.