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Troubleshoot performance tools issues

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Applies to: yesVisual Studio noVisual Studio for Mac

Note

This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

You might experience one of the following issues when you use the Profiling Tools:

No data is collected by the profiling tools

After you profile an application, a profiling data (.vsp) file is not created and you receive the following warning in the Output window or in the command window:

PRF0025: No data was collected.

This problem can be caused by several issues:

  • A process that was profiled by using the sampling or the .NET memory method starts a child process that becomes the process that performs the application work. For example, some applications read the command line to determine whether they were started as a Windows application or as a command-line application. If a Windows application was requested, the original process starts a new process configured as a Windows application and then the original process exits. Because the Profiling Tools do not automatically collect data for child processes, no data is collected.

    To collect profiling data in this situation, attach the profiler to the child process instead of starting the application with the profiler. For more information, see How to: Attach and detach performance tools to running processes and Attach (VSPerfCmd)

Performance views and reports display numbers for function names

After you profile an application, you see numbers instead of function names in reports and views.

This problem is caused by the Profiling Tools analysis engine being unable to find the .pdb files that contain the symbol information that maps source code information, such function names and line numbers to the compiled file. By default, the compiler creates the .pdb file when the application file is built. A reference to the local directory of the .pdb file is stored in the compiled application. The analysis engine looks in the referenced directory for the .pdb file and then in the file that currently contains the application file. If the .pdb file is not found, the analysis engine uses the function offsets instead of the function names.

You can fix the problem in one of two ways:

Note

The analysis engine requires that the .pdb file is the same version as the compiled application file. A .pdb file from an earlier or later build of the application file will not work.