proto/decode_test.go - third_party/github.com/golang/protobuf - Git at Google

 // Go support for Protocol Buffers - Google's data interchange format
 //
 // Copyright 2010 The Go Authors.  All rights reserved.
 // https://github.com/golang/protobuf
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 // +build go1.7

 package proto_test

 import (
 	"fmt"
 	"testing"

 	"github.com/golang/protobuf/proto"
 	tpb "github.com/golang/protobuf/proto/proto3_proto"
 )

 var msgBlackhole = new(tpb.Message)

 // BenchmarkVarint32ArraySmall shows the performance on an array of small int32 fields (1 and
 // 2 bytes long).
 func BenchmarkVarint32ArraySmall(b *testing.B) {
 	for i := uint(1); i <= 10; i++ {
 		dist := genInt32Dist([7]int{0, 3, 1}, 1<<i)
 		raw, err := proto.Marshal(&tpb.Message{
 			ShortKey: dist,
 		})
 		if err != nil {
 			b.Error("wrong encode", err)
 		}
 		b.Run(fmt.Sprintf("Len%v", len(dist)), func(b *testing.B) {
 			scratchBuf := proto.NewBuffer(nil)
 			b.ResetTimer()
 			for k := 0; k < b.N; k++ {
 				scratchBuf.SetBuf(raw)
 				msgBlackhole.Reset()
 				if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
 					b.Error("wrong decode", err)
 				}
 			}
 		})
 	}
 }

 // BenchmarkVarint32ArrayLarge shows the performance on an array of large int32 fields (3 and
 // 4 bytes long, with a small number of 1, 2, 5 and 10 byte long versions).
 func BenchmarkVarint32ArrayLarge(b *testing.B) {
 	for i := uint(1); i <= 10; i++ {
 		dist := genInt32Dist([7]int{0, 1, 2, 4, 8, 1, 1}, 1<<i)
 		raw, err := proto.Marshal(&tpb.Message{
 			ShortKey: dist,
 		})
 		if err != nil {
 			b.Error("wrong encode", err)
 		}
 		b.Run(fmt.Sprintf("Len%v", len(dist)), func(b *testing.B) {
 			scratchBuf := proto.NewBuffer(nil)
 			b.ResetTimer()
 			for k := 0; k < b.N; k++ {
 				scratchBuf.SetBuf(raw)
 				msgBlackhole.Reset()
 				if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
 					b.Error("wrong decode", err)
 				}
 			}
 		})
 	}
 }

 // BenchmarkVarint64ArraySmall shows the performance on an array of small int64 fields (1 and
 // 2 bytes long).
 func BenchmarkVarint64ArraySmall(b *testing.B) {
 	for i := uint(1); i <= 10; i++ {
 		dist := genUint64Dist([11]int{0, 3, 1}, 1<<i)
 		raw, err := proto.Marshal(&tpb.Message{
 			Key: dist,
 		})
 		if err != nil {
 			b.Error("wrong encode", err)
 		}
 		b.Run(fmt.Sprintf("Len%v", len(dist)), func(b *testing.B) {
 			scratchBuf := proto.NewBuffer(nil)
 			b.ResetTimer()
 			for k := 0; k < b.N; k++ {
 				scratchBuf.SetBuf(raw)
 				msgBlackhole.Reset()
 				if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
 					b.Error("wrong decode", err)
 				}
 			}
 		})
 	}
 }

 // BenchmarkVarint64ArrayLarge shows the performance on an array of large int64 fields (6, 7,
 // and 8 bytes long with a small number of the other sizes).
 func BenchmarkVarint64ArrayLarge(b *testing.B) {
 	for i := uint(1); i <= 10; i++ {
 		dist := genUint64Dist([11]int{0, 1, 1, 2, 4, 8, 16, 32, 16, 1, 1}, 1<<i)
 		raw, err := proto.Marshal(&tpb.Message{
 			Key: dist,
 		})
 		if err != nil {
 			b.Error("wrong encode", err)
 		}
 		b.Run(fmt.Sprintf("Len%v", len(dist)), func(b *testing.B) {
 			scratchBuf := proto.NewBuffer(nil)
 			b.ResetTimer()
 			for k := 0; k < b.N; k++ {
 				scratchBuf.SetBuf(raw)
 				msgBlackhole.Reset()
 				if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
 					b.Error("wrong decode", err)
 				}
 			}
 		})
 	}
 }

 // BenchmarkVarint64ArrayMixed shows the performance of lots of small messages, each
 // containing a small number of large (3, 4, and 5 byte) repeated int64s.
 func BenchmarkVarint64ArrayMixed(b *testing.B) {
 	for i := uint(1); i <= 1<<5; i <<= 1 {
 		dist := genUint64Dist([11]int{0, 0, 0, 4, 6, 4, 0, 0, 0, 0, 0}, int(i))
 		// number of sub fields
 		for k := uint(1); k <= 1<<10; k <<= 2 {
 			msg := &tpb.Message{}
 			for m := uint(0); m < k; m++ {
 				msg.Children = append(msg.Children, &tpb.Message{
 					Key: dist,
 				})
 			}
 			raw, err := proto.Marshal(msg)
 			if err != nil {
 				b.Error("wrong encode", err)
 			}
 			b.Run(fmt.Sprintf("Fields%vLen%v", k, i), func(b *testing.B) {
 				scratchBuf := proto.NewBuffer(nil)
 				b.ResetTimer()
 				for k := 0; k < b.N; k++ {
 					scratchBuf.SetBuf(raw)
 					msgBlackhole.Reset()
 					if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
 						b.Error("wrong decode", err)
 					}
 				}
 			})
 		}
 	}
 }

 // genInt32Dist generates a slice of ints that will match the size distribution of dist.
 // A size of 6 corresponds to a max length varint32, which is 10 bytes.  The distribution
 // is 1-indexed. (i.e. the value at index 1 is how many 1 byte ints to create).
 func genInt32Dist(dist [7]int, count int) (dest []int32) {
 	for i := 0; i < count; i++ {
 		for k := 0; k < len(dist); k++ {
 			var num int32
 			switch k {
 			case 1:
 				num = 1<<7 - 1
 			case 2:
 				num = 1<<14 - 1
 			case 3:
 				num = 1<<21 - 1
 			case 4:
 				num = 1<<28 - 1
 			case 5:
 				num = 1<<29 - 1
 			case 6:
 				num = -1
 			}
 			for m := 0; m < dist[k]; m++ {
 				dest = append(dest, num)
 			}
 		}
 	}
 	return
 }

 // genUint64Dist generates a slice of ints that will match the size distribution of dist.
 // The distribution is 1-indexed. (i.e. the value at index 1 is how many 1 byte ints to create).
 func genUint64Dist(dist [11]int, count int) (dest []uint64) {
 	for i := 0; i < count; i++ {
 		for k := 0; k < len(dist); k++ {
 			var num uint64
 			switch k {
 			case 1:
 				num = 1<<7 - 1
 			case 2:
 				num = 1<<14 - 1
 			case 3:
 				num = 1<<21 - 1
 			case 4:
 				num = 1<<28 - 1
 			case 5:
 				num = 1<<35 - 1
 			case 6:
 				num = 1<<42 - 1
 			case 7:
 				num = 1<<49 - 1
 			case 8:
 				num = 1<<56 - 1
 			case 9:
 				num = 1<<63 - 1
 			case 10:
 				num = 1<<64 - 1
 			}
 			for m := 0; m < dist[k]; m++ {
 				dest = append(dest, num)
 			}
 		}
 	}
 	return
 }

 // BenchmarkDecodeEmpty measures the overhead of doing the minimal possible decode.
 func BenchmarkDecodeEmpty(b *testing.B) {
 	raw, err := proto.Marshal(&tpb.Message{})
 	if err != nil {
 		b.Error("wrong encode", err)
 	}
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
 		if err := proto.Unmarshal(raw, msgBlackhole); err != nil {
 			b.Error("wrong decode", err)
 		}
 	}
 }
	// Go support for Protocol Buffers - Google's data interchange format
	//
	// Copyright 2010 The Go Authors. All rights reserved.
	// https://github.com/golang/protobuf
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are
	// met:
	//
	// * Redistributions of source code must retain the above copyright
	// notice, this list of conditions and the following disclaimer.
	// * Redistributions in binary form must reproduce the above
	// copyright notice, this list of conditions and the following disclaimer
	// in the documentation and/or other materials provided with the
	// distribution.
	// * Neither the name of Google Inc. nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	// +build go1.7

	package proto_test

	import (
	"fmt"
	"testing"

	"github.com/golang/protobuf/proto"
	tpb "github.com/golang/protobuf/proto/proto3_proto"
	)

	var msgBlackhole = new(tpb.Message)

	// BenchmarkVarint32ArraySmall shows the performance on an array of small int32 fields (1 and
	// 2 bytes long).
	func BenchmarkVarint32ArraySmall(b *testing.B) {
	for i := uint(1); i <= 10; i++ {
	dist := genInt32Dist([7]int{0, 3, 1}, 1<<i)
	raw, err := proto.Marshal(&tpb.Message{
	ShortKey: dist,
	})
	if err != nil {
	b.Error("wrong encode", err)
	}
	b.Run(fmt.Sprintf("Len%v", len(dist)), func(b *testing.B) {
	scratchBuf := proto.NewBuffer(nil)
	b.ResetTimer()
	for k := 0; k < b.N; k++ {
	scratchBuf.SetBuf(raw)
	msgBlackhole.Reset()
	if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
	b.Error("wrong decode", err)
	}
	}
	})
	}
	}

	// BenchmarkVarint32ArrayLarge shows the performance on an array of large int32 fields (3 and
	// 4 bytes long, with a small number of 1, 2, 5 and 10 byte long versions).
	func BenchmarkVarint32ArrayLarge(b *testing.B) {
	for i := uint(1); i <= 10; i++ {
	dist := genInt32Dist([7]int{0, 1, 2, 4, 8, 1, 1}, 1<<i)
	raw, err := proto.Marshal(&tpb.Message{
	ShortKey: dist,
	})
	if err != nil {
	b.Error("wrong encode", err)
	}
	b.Run(fmt.Sprintf("Len%v", len(dist)), func(b *testing.B) {
	scratchBuf := proto.NewBuffer(nil)
	b.ResetTimer()
	for k := 0; k < b.N; k++ {
	scratchBuf.SetBuf(raw)
	msgBlackhole.Reset()
	if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
	b.Error("wrong decode", err)
	}
	}
	})
	}
	}

	// BenchmarkVarint64ArraySmall shows the performance on an array of small int64 fields (1 and
	// 2 bytes long).
	func BenchmarkVarint64ArraySmall(b *testing.B) {
	for i := uint(1); i <= 10; i++ {
	dist := genUint64Dist([11]int{0, 3, 1}, 1<<i)
	raw, err := proto.Marshal(&tpb.Message{
	Key: dist,
	})
	if err != nil {
	b.Error("wrong encode", err)
	}
	b.Run(fmt.Sprintf("Len%v", len(dist)), func(b *testing.B) {
	scratchBuf := proto.NewBuffer(nil)
	b.ResetTimer()
	for k := 0; k < b.N; k++ {
	scratchBuf.SetBuf(raw)
	msgBlackhole.Reset()
	if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
	b.Error("wrong decode", err)
	}
	}
	})
	}
	}

	// BenchmarkVarint64ArrayLarge shows the performance on an array of large int64 fields (6, 7,
	// and 8 bytes long with a small number of the other sizes).
	func BenchmarkVarint64ArrayLarge(b *testing.B) {
	for i := uint(1); i <= 10; i++ {
	dist := genUint64Dist([11]int{0, 1, 1, 2, 4, 8, 16, 32, 16, 1, 1}, 1<<i)
	raw, err := proto.Marshal(&tpb.Message{
	Key: dist,
	})
	if err != nil {
	b.Error("wrong encode", err)
	}
	b.Run(fmt.Sprintf("Len%v", len(dist)), func(b *testing.B) {
	scratchBuf := proto.NewBuffer(nil)
	b.ResetTimer()
	for k := 0; k < b.N; k++ {
	scratchBuf.SetBuf(raw)
	msgBlackhole.Reset()
	if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
	b.Error("wrong decode", err)
	}
	}
	})
	}
	}

	// BenchmarkVarint64ArrayMixed shows the performance of lots of small messages, each
	// containing a small number of large (3, 4, and 5 byte) repeated int64s.
	func BenchmarkVarint64ArrayMixed(b *testing.B) {
	for i := uint(1); i <= 1<<5; i <<= 1 {
	dist := genUint64Dist([11]int{0, 0, 0, 4, 6, 4, 0, 0, 0, 0, 0}, int(i))
	// number of sub fields
	for k := uint(1); k <= 1<<10; k <<= 2 {
	msg := &tpb.Message{}
	for m := uint(0); m < k; m++ {
	msg.Children = append(msg.Children, &tpb.Message{
	Key: dist,
	})
	}
	raw, err := proto.Marshal(msg)
	if err != nil {
	b.Error("wrong encode", err)
	}
	b.Run(fmt.Sprintf("Fields%vLen%v", k, i), func(b *testing.B) {
	scratchBuf := proto.NewBuffer(nil)
	b.ResetTimer()
	for k := 0; k < b.N; k++ {
	scratchBuf.SetBuf(raw)
	msgBlackhole.Reset()
	if err := scratchBuf.Unmarshal(msgBlackhole); err != nil {
	b.Error("wrong decode", err)
	}
	}
	})
	}
	}
	}

	// genInt32Dist generates a slice of ints that will match the size distribution of dist.
	// A size of 6 corresponds to a max length varint32, which is 10 bytes. The distribution
	// is 1-indexed. (i.e. the value at index 1 is how many 1 byte ints to create).
	func genInt32Dist(dist [7]int, count int) (dest []int32) {
	for i := 0; i < count; i++ {
	for k := 0; k < len(dist); k++ {
	var num int32
	switch k {
	case 1:
	num = 1<<7 - 1
	case 2:
	num = 1<<14 - 1
	case 3:
	num = 1<<21 - 1
	case 4:
	num = 1<<28 - 1
	case 5:
	num = 1<<29 - 1
	case 6:
	num = -1
	}
	for m := 0; m < dist[k]; m++ {
	dest = append(dest, num)
	}
	}
	}
	return
	}

	// genUint64Dist generates a slice of ints that will match the size distribution of dist.
	// The distribution is 1-indexed. (i.e. the value at index 1 is how many 1 byte ints to create).
	func genUint64Dist(dist [11]int, count int) (dest []uint64) {
	for i := 0; i < count; i++ {
	for k := 0; k < len(dist); k++ {
	var num uint64
	switch k {
	case 1:
	num = 1<<7 - 1
	case 2:
	num = 1<<14 - 1
	case 3:
	num = 1<<21 - 1
	case 4:
	num = 1<<28 - 1
	case 5:
	num = 1<<35 - 1
	case 6:
	num = 1<<42 - 1
	case 7:
	num = 1<<49 - 1
	case 8:
	num = 1<<56 - 1
	case 9:
	num = 1<<63 - 1
	case 10:
	num = 1<<64 - 1
	}
	for m := 0; m < dist[k]; m++ {
	dest = append(dest, num)
	}
	}
	}
	return
	}

	// BenchmarkDecodeEmpty measures the overhead of doing the minimal possible decode.
	func BenchmarkDecodeEmpty(b *testing.B) {
	raw, err := proto.Marshal(&tpb.Message{})
	if err != nil {
	b.Error("wrong encode", err)
	}
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
	if err := proto.Unmarshal(raw, msgBlackhole); err != nil {
	b.Error("wrong decode", err)
	}
	}
	}