github.com/linapex/ethereum-go-chinese@v0.0.0-20190316121929-f8b7a73c3fa1/core/bench_test.go

//<developer>
//    <name>linapex 曹一峰</name>
//    <email>linapex@163.com</email>
//    <wx>superexc</wx>
//    <qqgroup>128148617</qqgroup>
//    <url>https://jsq.ink</url>
//    <role>pku engineer</role>
//    <date>2019-03-16 19:16:34</date>
//</624450077443756032>


package core

import (
	"crypto/ecdsa"
	"io/ioutil"
	"math/big"
	"os"
	"testing"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/math"
	"github.com/ethereum/go-ethereum/consensus/ethash"
	"github.com/ethereum/go-ethereum/core/rawdb"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/core/vm"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/ethdb"
	"github.com/ethereum/go-ethereum/params"
)

func BenchmarkInsertChain_empty_memdb(b *testing.B) {
	benchInsertChain(b, false, nil)
}
func BenchmarkInsertChain_empty_diskdb(b *testing.B) {
	benchInsertChain(b, true, nil)
}
func BenchmarkInsertChain_valueTx_memdb(b *testing.B) {
	benchInsertChain(b, false, genValueTx(0))
}
func BenchmarkInsertChain_valueTx_diskdb(b *testing.B) {
	benchInsertChain(b, true, genValueTx(0))
}
func BenchmarkInsertChain_valueTx_100kB_memdb(b *testing.B) {
	benchInsertChain(b, false, genValueTx(100*1024))
}
func BenchmarkInsertChain_valueTx_100kB_diskdb(b *testing.B) {
	benchInsertChain(b, true, genValueTx(100*1024))
}
func BenchmarkInsertChain_uncles_memdb(b *testing.B) {
	benchInsertChain(b, false, genUncles)
}
func BenchmarkInsertChain_uncles_diskdb(b *testing.B) {
	benchInsertChain(b, true, genUncles)
}
func BenchmarkInsertChain_ring200_memdb(b *testing.B) {
	benchInsertChain(b, false, genTxRing(200))
}
func BenchmarkInsertChain_ring200_diskdb(b *testing.B) {
	benchInsertChain(b, true, genTxRing(200))
}
func BenchmarkInsertChain_ring1000_memdb(b *testing.B) {
	benchInsertChain(b, false, genTxRing(1000))
}
func BenchmarkInsertChain_ring1000_diskdb(b *testing.B) {
	benchInsertChain(b, true, genTxRing(1000))
}

var (
//这是基准使用的Genesis块的内容。
	benchRootKey, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
	benchRootAddr   = crypto.PubkeyToAddress(benchRootKey.PublicKey)
	benchRootFunds  = math.BigPow(2, 100)
)

//genvaluetx返回包含单个
//值传输事务，每个事务中有n个字节的额外数据
//块。
func genValueTx(nbytes int) func(int, *BlockGen) {
	return func(i int, gen *BlockGen) {
		toaddr := common.Address{}
		data := make([]byte, nbytes)
		gas, _ := IntrinsicGas(data, false, false)
		tx, _ := types.SignTx(types.NewTransaction(gen.TxNonce(benchRootAddr), toaddr, big.NewInt(1), gas, nil, data), types.HomesteadSigner{}, benchRootKey)
		gen.AddTx(tx)
	}
}

var (
	ringKeys  = make([]*ecdsa.PrivateKey, 1000)
	ringAddrs = make([]common.Address, len(ringKeys))
)

func init() {
	ringKeys[0] = benchRootKey
	ringAddrs[0] = benchRootAddr
	for i := 1; i < len(ringKeys); i++ {
		ringKeys[i], _ = crypto.GenerateKey()
		ringAddrs[i] = crypto.PubkeyToAddress(ringKeys[i].PublicKey)
	}
}

//Gentxring返回一个以环形方式发送乙醚的块生成器
//在N个帐户中。这是在状态数据库中创建n个条目
//并用许多小事务填充块。
func genTxRing(naccounts int) func(int, *BlockGen) {
	from := 0
	return func(i int, gen *BlockGen) {
		block := gen.PrevBlock(i - 1)
		gas := CalcGasLimit(block, block.GasLimit(), block.GasLimit())
		for {
			gas -= params.TxGas
			if gas < params.TxGas {
				break
			}
			to := (from + 1) % naccounts
			tx := types.NewTransaction(
				gen.TxNonce(ringAddrs[from]),
				ringAddrs[to],
				benchRootFunds,
				params.TxGas,
				nil,
				nil,
			)
			tx, _ = types.SignTx(tx, types.HomesteadSigner{}, ringKeys[from])
			gen.AddTx(tx)
			from = to
		}
	}
}

//Genincles生成带有两个叔叔头的块。
func genUncles(i int, gen *BlockGen) {
	if i >= 6 {
		b2 := gen.PrevBlock(i - 6).Header()
		b2.Extra = []byte("foo")
		gen.AddUncle(b2)
		b3 := gen.PrevBlock(i - 6).Header()
		b3.Extra = []byte("bar")
		gen.AddUncle(b3)
	}
}

func benchInsertChain(b *testing.B, disk bool, gen func(int, *BlockGen)) {
//在内存或临时目录中创建数据库。
	var db ethdb.Database
	if !disk {
		db = ethdb.NewMemDatabase()
	} else {
		dir, err := ioutil.TempDir("", "eth-core-bench")
		if err != nil {
			b.Fatalf("cannot create temporary directory: %v", err)
		}
		defer os.RemoveAll(dir)
		db, err = ethdb.NewLDBDatabase(dir, 128, 128)
		if err != nil {
			b.Fatalf("cannot create temporary database: %v", err)
		}
		defer db.Close()
	}

//使用提供的块生成B.N块链
//发电机功能。
	gspec := Genesis{
		Config: params.TestChainConfig,
		Alloc:  GenesisAlloc{benchRootAddr: {Balance: benchRootFunds}},
	}
	genesis := gspec.MustCommit(db)
	chain, _ := GenerateChain(gspec.Config, genesis, ethash.NewFaker(), db, b.N, gen)

//给插入新链条计时。
//状态和块存储在同一个数据库中。
	chainman, _ := NewBlockChain(db, nil, gspec.Config, ethash.NewFaker(), vm.Config{}, nil)
	defer chainman.Stop()
	b.ReportAllocs()
	b.ResetTimer()
	if i, err := chainman.InsertChain(chain); err != nil {
		b.Fatalf("insert error (block %d): %v\n", i, err)
	}
}

func BenchmarkChainRead_header_10k(b *testing.B) {
	benchReadChain(b, false, 10000)
}
func BenchmarkChainRead_full_10k(b *testing.B) {
	benchReadChain(b, true, 10000)
}
func BenchmarkChainRead_header_100k(b *testing.B) {
	benchReadChain(b, false, 100000)
}
func BenchmarkChainRead_full_100k(b *testing.B) {
	benchReadChain(b, true, 100000)
}
func BenchmarkChainRead_header_500k(b *testing.B) {
	benchReadChain(b, false, 500000)
}
func BenchmarkChainRead_full_500k(b *testing.B) {
	benchReadChain(b, true, 500000)
}
func BenchmarkChainWrite_header_10k(b *testing.B) {
	benchWriteChain(b, false, 10000)
}
func BenchmarkChainWrite_full_10k(b *testing.B) {
	benchWriteChain(b, true, 10000)
}
func BenchmarkChainWrite_header_100k(b *testing.B) {
	benchWriteChain(b, false, 100000)
}
func BenchmarkChainWrite_full_100k(b *testing.B) {
	benchWriteChain(b, true, 100000)
}
func BenchmarkChainWrite_header_500k(b *testing.B) {
	benchWriteChain(b, false, 500000)
}
func BenchmarkChainWrite_full_500k(b *testing.B) {
	benchWriteChain(b, true, 500000)
}

//makechainforbench写入给定数量的头或空块/收据
//进入数据库。
func makeChainForBench(db ethdb.Database, full bool, count uint64) {
	var hash common.Hash
	for n := uint64(0); n < count; n++ {
		header := &types.Header{
			Coinbase:    common.Address{},
			Number:      big.NewInt(int64(n)),
			ParentHash:  hash,
			Difficulty:  big.NewInt(1),
			UncleHash:   types.EmptyUncleHash,
			TxHash:      types.EmptyRootHash,
			ReceiptHash: types.EmptyRootHash,
		}
		hash = header.Hash()

		rawdb.WriteHeader(db, header)
		rawdb.WriteCanonicalHash(db, hash, n)
		rawdb.WriteTd(db, hash, n, big.NewInt(int64(n+1)))

		if full || n == 0 {
			block := types.NewBlockWithHeader(header)
			rawdb.WriteBody(db, hash, n, block.Body())
			rawdb.WriteReceipts(db, hash, n, nil)
		}
	}
}

func benchWriteChain(b *testing.B, full bool, count uint64) {
	for i := 0; i < b.N; i++ {
		dir, err := ioutil.TempDir("", "eth-chain-bench")
		if err != nil {
			b.Fatalf("cannot create temporary directory: %v", err)
		}
		db, err := ethdb.NewLDBDatabase(dir, 128, 1024)
		if err != nil {
			b.Fatalf("error opening database at %v: %v", dir, err)
		}
		makeChainForBench(db, full, count)
		db.Close()
		os.RemoveAll(dir)
	}
}

func benchReadChain(b *testing.B, full bool, count uint64) {
	dir, err := ioutil.TempDir("", "eth-chain-bench")
	if err != nil {
		b.Fatalf("cannot create temporary directory: %v", err)
	}
	defer os.RemoveAll(dir)

	db, err := ethdb.NewLDBDatabase(dir, 128, 1024)
	if err != nil {
		b.Fatalf("error opening database at %v: %v", dir, err)
	}
	makeChainForBench(db, full, count)
	db.Close()

	b.ReportAllocs()
	b.ResetTimer()

	for i := 0; i < b.N; i++ {
		db, err := ethdb.NewLDBDatabase(dir, 128, 1024)
		if err != nil {
			b.Fatalf("error opening database at %v: %v", dir, err)
		}
		chain, err := NewBlockChain(db, nil, params.TestChainConfig, ethash.NewFaker(), vm.Config{}, nil)
		if err != nil {
			b.Fatalf("error creating chain: %v", err)
		}

		for n := uint64(0); n < count; n++ {
			header := chain.GetHeaderByNumber(n)
			if full {
				hash := header.Hash()
				rawdb.ReadBody(db, hash, n)
				rawdb.ReadReceipts(db, hash, n)
			}
		}
		chain.Stop()
		db.Close()
	}
}