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The Start option is a VSPerfCmd.exe option that initializes the profiler to the specified profiling method.

VSPerfCmd.exe /Start:Method /Output:FileName [Options]


Must be one of the following keywords:

  • TRACE - Specifies the instrumentation method.

  • SAMPLE - Specifies the sampling method.

  • COVERAGE - Specifies code coverage.

  • CONCURRENCY - Specifies the resource contention method.

The Output option must be specified when Start is specified on the command line.

Output: filename

Specifies the output file name.

The following options can only be used with the Start option on a command line.


Enables cross-process profiling. The option names CrossSession and CS are both supported.


Enables client access to the monitor from the specified account.

WinCounter: Path [Automark:n]

WinCounter specifies a Windows performance counter to include as a mark in the profiling data file. AutoMark specifies the interval in milliseconds between collections of the data file.

The following options cannot be used with the Start option on a command line.


Status applies to those processes that are profiled. It lists processes and threads and their current profile state (On/Off). For example, if a process is stopped, Status will not indicate this in the report. Status will show that the process is either profiled or not.


Turns the profiler off.

The following example demonstrates how to use the VSPerfCmd.exe Start option to initialize the profiler.

VSPerfCmd.exe /Start:Sample /Output:TestApp.exe.vsp
VSPerfCmd.exe /Launch:TestApp.exe