Go Interface vs Direct Method Call Benchmark

This benchmark compares the performance of interface vs direct method calls in Go. Each benchmark creates a struct, containing a single method. It will then call the method on the struct, either directly or via an interface.

Implementations

Green marks the fastest implementation, red marks the slowest

Full Benchmark Code

type DirectStruct struct{}

func (m DirectStruct) Method() {}

func BenchmarkDirectMethodCall_run(b *testing.B) {
	s := DirectStruct{}
	for i := 0; i < b.N; i++ {
		s.Method()
	}
}

type Interface interface {
	Method()
}

type InterfaceStruct struct{}

func (m InterfaceStruct) Method() {}

func BenchmarkInterfaceMethodCall_run(b *testing.B) {
	var s Interface = InterfaceStruct{}
	for i := 0; i < b.N; i++ {
		s.Method()
	}
}

Full Benchmark Output