using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;
using System.Reflection;

[MemoryDiagnoser]
public class Program
{
    static void Main(string[] args) => BenchmarkSwitcher.FromAssemblies(new[] { typeof(Program).Assembly }).Run(args);

    private PropertyInfo _prop = typeof(B).GetProperty("MyProp");

    [Benchmark]
    public Attribute[] Get() => Attribute.GetCustomAttributes(_prop, inherit: true);
}

class A { }

class B : A
{
    [My]
    public int MyProp { get; set; }
}

class MyAttribute : Attribute { }