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ThreadOn and ThreadOff

The VSPerfCmd.exe ThreadOff and ThreadOn subcommands are only available in command-line profiling sessions that use the instrumentation method. ThreadOff and ThreadOn pause and resume profiling for the specified thread. ThreadOff stops profiling the thread and ThreadOn starts profiling the thread.

In most cases, you specify ThreadOn or ThreadOff as the only option in a VSPerfCmd.exe command line, but they can also be combined with the GlobalOn, GlobalOff, ProcessOn, and ProcessOff subcommands.

The ThreadOn and ThreadOff subcommands interact with the GlobalOn and GlobalOff subcommands that control data collection for all processes in a command-line profiling session, and the ProcessOn and ProcessOff subcommands that control data collection for a specified process.

The ThreadOff and ThreadOn subcommands also affect the Thread Start/Stop count that is manipulated by profiler API functions.

  • ThreadOff immediately sets the Thread Start/Stop Count to 0 and therefore pauses profiling.

  • ThreadOn immediately sets the Thread Start/Stop Count to 1 and therefore resumes profiling.

For more information, see Profiling Tools APIs.

VSPerfCmd.exe /{ThreadOff|ThreadOn}:TID [Options]

TID

The integer identifier of the thread to start or stop.

ThreadOn and ThreadOff 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.

GlobalOff|GlobalOn

Stops or starts profiling for all processes in a command-line profiling session.

{ProcessOff|ProcessOn}:TID

Stops or starts profiling for the specified process.

In this example, the ThreadOff subcommand is used to stop collecting profiling data so that only application startup data is collected.

; Initialize the profiler.
VSPerfCmd.exe /Start:Trace /Output:Instrument.vsp 
; Start the instrumented application.
; Stop profiling the thread after startup.
VSPerfCmd.exe /ThreadOff:12345
; Shut down the target application.
; Close the profiler.
VSPerfCmd /Shutdown
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