GC (VSPerfCmd)
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 GC option enables the collection of .NET Framework memory allocation and object lifetime data. The GC option can only be used with the sampling profiling method and only with the Launch option.
When you are using the GC option, the VSPerfClrEnv /sampleon command is not required.
If no parameters are specified, or if the Allocation parameter is specified, only .NET Framework memory allocation data is collected. If the Lifetime parameter is specified, both .NET Framework memory allocation and .NET Framework object lifetime data is collected.
Syntax
VSPerfCmd.exe /Launch:AppName /GC[:{Allocation|Lifetime}] [Options]
Parameters
Allocation Default. Collects .NET Framework memory allocation data.
Lifetime Collects both .NET Framework memory allocation data and .NET Framework object lifetime data.
Required Options
The GC option can only be used with the Launch option.
Launch: AppName
Starts the specified application and begins profiling with the sampling method.
Example
The following example launches an application and collects .NET Framework memory allocation data.
VSPerfCmd.exe /Launch:TestApp.exe /gc