ProcessOn and ProcessOff
Applies to: 
Visual Studio 
Visual 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
The VSPerfCmd.exe ProcessOff and ProcessOn subcommands pause and resume profiling for the specified process in a command-line profiling session. ProcessOff stops profiling the process and ProcessOn starts profiling the process.
In most cases, you specify ProcessOn or ProcessOff as the only option in a VSPerfCmd.exe command line, but they can also be combined with the GlobalOn, GlobalOff, ThreadOn, and ThreadOff subcommands.
The ProcessOn and ProcessOff subcommands interact with the GlobalOn and GlobalOff subcommands that control data collection for all processes in a command-line profiling session, and the ThreadOn and ThreadOff subcommands that control data collection for a specified thread.
The ProcessOff and ProcessOn subcommands also affect the Process Start/Stop count that is manipulated by profiler API functions.
ProcessOff immediately sets the Process Start/Stop Count to 0 and therefore pauses profiling.
ProcessOn immediately sets the Process Start/Stop Count to 1 and therefore resumes profiling.
For more information, see Profiling Tools APIs.
Syntax
VSPerfCmd.exe /{ProcessOff|ProcessOn}:PID [Options]
Parameters
PID
The integer identifier of the process to start or stop. Process IDs are listed on the Process tab of Windows Task Manager.
Required Subcommands
None
Valid Subcommands
ProcessOn and ProcessOff can be specified on command lines that also contain the following subcommands.
Start: Method
Initializes the command-line profiling session and sets the specified profiling method.
Launch: AppName
Starts the specified application and begins profiling with the sampling method.
Attach: PID
Begins profiling the specified process.
GlobalOff|GlobalOn Stops or starts profiling for all processes in a command-line profiling session.
{ThreadOff|ThreadOn}:TID
Stops or starts profiling for the specified thread (instrumentation method only).
Example
In this example, the ProcessOff subcommand is used to collect profiling data for application startup.
; Initialize the profiler.
VSPerfCmd.exe /Start:Trace /Output:Instrument.vsp
; Start the instrumented application.
; Stop profiling the process after startup.
VSPerfCmd.exe /ProcessOff:12345
; Shut down the target application.
; Close the profiler.
VSPerfCmd /Shutdown