sampleProfilerinteggration.cs

namespace BenchmarkDotNet.Samples
{
    class Program
    {
        static void Main(string[] args)
        {
            BenchmarkRunner.Run<TheTypeWithBenchmarks>(DefaultConfig.Instance.With(new SampleIntegrationWithProfiler()));
        }
    }

    public class SampleIntegrationWithProfiler : IDiagnoser
    {
        private Process profiler;

        public IEnumerable<string> Ids => new[] { nameof(SampleIntegrationWithProfiler) };

        // it tells BDN to run benchmarks once again with this diagnoser enabled, do the diagnostics and discard results (they are affected by oveerhead)
        public Diagnosers.RunMode GetRunMode(Benchmark benchmark) => Diagnosers.RunMode.ExtraRun;

        public void Handle(HostSignal signal, DiagnoserActionParameters parameters)
        {
            if (signal == HostSignal.BeforeMainRun)
                profiler = Process.Start("thePathToProfiler.exe", $"somehow tell the profiler to attach to this process {parameters.Process.Id}");
            else if (signal == HostSignal.AfterMainRun)
                profiler.Close();
        }

        public IEnumerable<IExporter> Exporters => Array.Empty<IExporter>();
        public void DisplayResults(ILogger logger) { }
        public IColumnProvider GetColumnProvider() => EmptyColumnProvider.Instance;
        public IEnumerable<ValidationError> Validate(ValidationParameters validationParameters) => Array.Empty<ValidationError>();
        public void ProcessResults(DiagnoserResults results) { }
    }
}