HRESULT PIXEndCapture(  
         BOOL discard  
)  

//
//  timing capture
//
PIXCaptureParameters captureParams = {};

captureParams.TimingCaptureParameters.CaptureGpuTiming = TRUE;
captureParams.TimingCaptureParameters.CaptureCallstacks = TRUE;
captureParams.TimingCaptureParameters.CaptureCpuSamples = TRUE;
captureParams.TimingCaptureParameters.CpuSamplesPerSecond = 4000;

captureParams.TimingCaptureParameters.CaptureStorage = PIXCaptureParameters::Memory;
captureParams.TimingCaptureParameters.FileName = wstrFilename;
captureParams.TimingCaptureParameters.MaximumToolingMemorySizeMb = 4096;

XSF_ERROR_IF_FAILED(PIXBeginCapture(PIX_CAPTURE_TIMING, &captureParams));

while (PIXEndCapture(FALSE) == E_PENDING)
{
    // Keep running
}