Thread dump analysis is a critical aspect of diagnosing performance problems and identifying the root causes of issues in Java applications. However, it can often be a daunting and time-consuming task, especially when dealing with numerous threads and intricate stack traces. That’s where the ‘Divide & Conquer Panel’ comes into play.

In this post, we will provide you with a comprehensive guide on how to leverage this feature to streamline your thread dump analysis workflow. You’ll learn how to categorize identical stack traces, move threads to the appropriate tabs, and ultimately identify problematic threads with ease. Whether you’re a seasoned Java developer or just diving into the world of thread analysis, this post will equip you with the knowledge and techniques needed to harness the full potential of the ‘Divide & Conquer Panel.’

Tabs Overview

The ‘Divide & Conquer Panel’ in fastThread introduces a streamlined approach to managing thread stack traces. It achieves this through three distinct tabs, each serving a unique purpose. Understanding these tabs is essential for efficient thread dump analysis. Below, we provide an overview of each tab:

1. Unreviewed Stacktraces:

  • This is the default landing tab when you access the ‘Divide & Conquer Panel.’
  • Threads with identical stacktraces are initially grouped here for your attention.
  • The ‘Thread Count’ column indicates how many threads share the same stacktrace.
  • The ‘Identical Stacktrace’ column displays the common stacktrace for the grouped threads.
  • You have the option to move threads from this tab to ‘Good Stacktraces’ or ‘Suspicious Stacktraces’ based on your analysis.

2. Good Stacktraces:

  • Threads that you consider non-problematic or ‘good’ can be moved to this tab.
  • It serves as a repository for threads with stacktraces that don’t require immediate attention.
  • Easy access to ‘Good Stacktraces’ ensures you can focus your efforts on problematic threads in the ‘Unreviewed Stacktraces’ tab.

3. Suspicious Stacktraces:

  • Threads that raise concerns or are potentially problematic can be moved to this tab.
  • Use this tab to isolate threads that require further investigation or debugging.
  • By categorizing threads as ‘suspicious,’ you can prioritize resolving critical issues within your Java application.

Categorization Process

The core functionality of the ‘Divide & Conquer Panel’ revolves around the categorization of threads with identical stacktraces. This process allows you to efficiently identify and manage threads based on their characteristics. Let’s delve into the categorization process step by step:

1. Identify Identical StackTraces:

  • Start by reviewing the threads listed under the ‘Unreviewed Stacktraces’ tab.
  • Look for threads with identical stacktraces; these are typically threads facing the same issues.
  • Identical stacktraces are displayed in the ‘Identical Stacktrace’ column.

2. Assess Thread Count:

  • Observe the ‘Thread Count’ column to determine how many threads share the same stacktrace.
  • A higher thread count often indicates a more widespread issue.

3. Categorize Threads:

  • Based on your analysis of the stacktraces, categorize threads into two primary groups: ‘Good’ and ‘Suspicious.’
  • ‘Good’ threads are those that you deem non-problematic and can be safely categorized as such.
  • ‘Suspicious’ threads are those that raise concerns or are potentially problematic, warranting further investigation.

4. Use the ‘Move To’ Buttons:

  • Utilize the ‘Move To’ buttons associated with each thread listed in the ‘Unreviewed Stacktraces’ tab.
  • If you believe a thread is ‘Good,’ click the ‘Good’ button to move it to the ‘Good Stacktraces’ tab.
  • If you identify a thread as ‘Suspicious,’ click the ‘Suspicious’ button to move it to the ‘Suspicious Stacktraces’ tab.

5. Ongoing Review:

  • Continue reviewing threads in the ‘Unreviewed Stacktraces’ tab and categorizing them accordingly.
  • Regularly check the ‘Good Stacktraces’ and ‘Suspicious Stacktraces’ tabs to monitor your progress and focus your efforts on problematic threads.
  • By following this categorization process, you streamline your thread dump analysis workflow. Threads with similar issues are grouped together, enabling you to identify trends and address problems more effectively. This systematic approach simplifies the identification of the root causes of issues in your Java applications.


The ‘Divide & Conquer Panel’ in fastThread has proven to be a useful tool for simplifying the often complex and time-consuming process of thread dump analysis in Java applications. By intelligently categorizing threads with identical stacktraces and providing a structured workflow, this feature equips you with the means to streamline your troubleshooting efforts.