clone_bench_test.go

package conformance

import (
	"google.golang.org/protobuf/proto"
	"testing"
)

const (
	numObjects = 1000
)

func BenchmarkOptimizedClone(b *testing.B) {
	x := &TestAllTypesProto3{}
	for i := 0; i < numObjects; i++ {
		x.RepeatedNestedMessage = append(x.RepeatedNestedMessage, &TestAllTypesProto3_NestedMessage{A: int32(i)})
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		_ = x.CloneVT()
	}
}

func BenchmarkProtoCloneWholeObject(b *testing.B) {
	x := &TestAllTypesProto3{}
	for i := 0; i < numObjects; i++ {
		x.RepeatedNestedMessage = append(x.RepeatedNestedMessage, &TestAllTypesProto3_NestedMessage{A: int32(i)})
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		_ = proto.Clone(x)
	}
}

func BenchmarkProtoCloneIndividualObjects(b *testing.B) {
	x := &TestAllTypesProto3{}
	for i := 0; i < numObjects; i++ {
		x.RepeatedNestedMessage = append(x.RepeatedNestedMessage, &TestAllTypesProto3_NestedMessage{A: int32(i)})
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		y := &TestAllTypesProto3{
			RepeatedNestedMessage: make([]*TestAllTypesProto3_NestedMessage, len(x.RepeatedNestedMessage)),
		}
		for j, v := range x.RepeatedNestedMessage {
			y.RepeatedNestedMessage[j] = proto.Clone(v).(*TestAllTypesProto3_NestedMessage)
		}
	}
}

Results:

goos: darwin
goarch: amd64
pkg: github.com/planetscale/vtprotobuf/conformance/internal/conformance
cpu: Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
BenchmarkOptimizedClone
BenchmarkOptimizedClone-16                 	   24648	     49900 ns/op
BenchmarkProtoCloneWholeObject
BenchmarkProtoCloneWholeObject-16          	   12634	     87447 ns/op
BenchmarkProtoCloneIndividualObjects
BenchmarkProtoCloneIndividualObjects-16    	    6740	    154005 ns/op
PASS