The power of per-frame GC analysis blog source

EnumAndCustomComparer.cs

// #IMPL: If you change the underlying type, update ProtoSomething.ComparerImpl too!
public enum HardCodedThing : byte
{
       Some,
       Thing,
       Something,
       Darkside
       cMaxCount,
};

public sealed class ProtoSomething
{
       // I don't make this private, in the event that IL2CPP can generate code without virtual dispatching when the actual type is known
       public sealed class ComparerImpl
              : IComparer<HardCodedThing>
              , IEqualityComparer<HardCodedThing>
       {
              // if ProtoSomething were a struct you'd want to
              // define this in here since static ctors in structs are fuzzy in behavior.
              // They also have infectious codegen in the containing type, due to statics in .NET being lazy loaded
              // See this article for more: http://kornnerstudios.blogspot.com/2015/12/seeing-sharp-c-behind-il2cpp-magic-of.html
              public static readonly ComparerImpl sInstance = new ComparerImpl();

              public int Compare(HardCodedThing x, HardCodedThing y)
              {
                      return (int)x - (int)y;
              }

              public bool Equals(HardCodedThing x, HardCodedThing y)
              {
                      return x == y;
              }

              public int GetHashCode(HardCodedThing obj)
              {
                      // Casting to the underlying type then calling get hash code shouldn't result in a box...
                      return ((byte)obj).GetHashCode();
              }
       };

       /// <summary>ALWAYS use this in your Dictionary ctors which use HardCodedThing as a key</summary>
       public static ComparerImpl Comparer { get { return ComparerImpl.sInstance; } }
};

type_avg_allocs.csv

// Excerpt from our CSV report...although really a TSV, since we use tabs, thanks to generic types including commas
// The avg allocs and frees are computed from the TOTAL counts divided by the TOTAL frames (I eventually added support to divide just by the count of frames the type actually appeared in). Garbage percent is (avg_frees / avg_allocations) * 100.0f
// The 'frees skipped' is from types previously allocated before the frame we started at. 'allocs skipped' is from potential erronous cases, which this type had none
name	avg allocs	avg frees	garbage percent	allocs skipped	frees skipped
UnityEngine.AnimatorControllerParameter	118.311119	112.544075	95.125526	0	2937

type_avg_allocs.csv_blame_list.txt

// Except from our blame report matching the .csv file in this gist
// SomeSecretObjectUX:SetAnimFloat checks that a given parameter name/nameHash exists on the Unity Animator and returns false when it doesn't.
// This behavior was later changed to only Debug.Log and return false in UNITY_EDITOR builds, since every time UnityEngine.Animator:get_parameters is called it creates managed memory

**** Type: UnityEngine.AnimatorControllerParameter
	Unique backtraces 13
		142340 (%63.121670) // how many allocations this specific backtrace contributed, and the overall percentage of allocs it accounts for
			(wrapper managed-to-native) UnityEngine.Animator:get_parameters
			UnityExtensions:HasParameter
			SomeSecretObjectUX:SetAnimFloat
			SomeSecretMonoBehaviour:Update
			(wrapper runtime-invoke) object:runtime_invoke_void__this__
		45876 (%20.344034)
			(wrapper managed-to-native) UnityEngine.Animator:get_parameters
			UnityExtensions:HasParameter
			SomeSecretObjectUX:SetAnimFloat
			SomeSecretMonoBehaviour:Update
			(wrapper runtime-invoke) object:runtime_invoke_void__this__
		26780 (%11.875779)
			(wrapper managed-to-native) UnityEngine.Animator:get_parameters
			UnityExtensions:HasParameter
			SomeSecretObjectUX:SetAnimFloat
			SomeSecretMonoBehaviour:Update
			(wrapper runtime-invoke) object:runtime_invoke_void__this__