How do you analyze a dump file for high CPU

To analyze a dump file with WinDbg for high CPU usage, follow these steps:

  1. Follow steps 1-4 from the previous response to install WinDbg, open the dump file, set the symbol path, and load the necessary extensions.
  2. Identify the threads with high CPU usage: Run the !runaway command in the WinDbg command window to display a list of threads sorted by their CPU usage:

This command will show you the threads with the highest CPU usage at the top of the list.

  1. Switch to the thread with high CPU usage: Choose the thread with the highest CPU usage (usually the first one in the list) and switch to it using the ~ command followed by the thread number and the s option:

Replace <thread_number> with the actual thread number from the !runaway output.

  1. Analyze the call stack: Run the kb command to display the call stack of the selected thread:

This command will show you the functions and modules involved in the high CPU usage for the selected thread. Look for any suspicious or unexpected function calls that might be causing the high CPU usage.

  1. Investigate managed code (if applicable): If you’re debugging managed code, use the SOS debugging extension to analyze the managed call stack. Run the !clrstack command:

This command will display the managed call stack for the selected thread, showing you the .NET methods involved in the high CPU usage.

  1. Analyze other threads (if necessary): If you need to analyze other threads with high CPU usage, repeat steps 3-5 for each thread of interest.
  2. Save your analysis: Save the output of your analysis as described in the previous response.

Keep in mind that analyzing dump files for high CPU usage can be a complex process, and you may need to use various commands and techniques to diagnose the issue. Familiarize yourself with WinDbg commands and extensions to make the most of your debugging experience.

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