mirror of
https://github.com/ethereum/go-ethereum.git
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bf8f63dcd2
This pull introduces a `Prefetch` operation in the trie to prefetch trie nodes in parallel. It is used by the `triePrefetcher` to accelerate state loading and improve overall chain processing performance.
122 lines
4.2 KiB
Go
122 lines
4.2 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"bytes"
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"runtime"
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"sync/atomic"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/params"
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"golang.org/x/sync/errgroup"
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)
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// statePrefetcher is a basic Prefetcher that executes transactions from a block
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// on top of the parent state, aiming to prefetch potentially useful state data
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// from disk. Transactions are executed in parallel to fully leverage the
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// SSD's read performance.
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type statePrefetcher struct {
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config *params.ChainConfig // Chain configuration options
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chain *HeaderChain // Canonical block chain
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}
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// newStatePrefetcher initialises a new statePrefetcher.
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func newStatePrefetcher(config *params.ChainConfig, chain *HeaderChain) *statePrefetcher {
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return &statePrefetcher{
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config: config,
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chain: chain,
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}
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}
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// Prefetch processes the state changes according to the Ethereum rules by running
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// the transaction messages using the statedb, but any changes are discarded. The
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// only goal is to warm the state caches.
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func (p *statePrefetcher) Prefetch(block *types.Block, statedb *state.StateDB, cfg vm.Config, interrupt *atomic.Bool) {
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var (
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fails atomic.Int64
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header = block.Header()
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signer = types.MakeSigner(p.config, header.Number, header.Time)
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workers errgroup.Group
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reader = statedb.Reader()
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)
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workers.SetLimit(max(1, 4*runtime.NumCPU()/5)) // Aggressively run the prefetching
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// Iterate over and process the individual transactions
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for i, tx := range block.Transactions() {
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stateCpy := statedb.Copy() // closure
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workers.Go(func() error {
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// If block precaching was interrupted, abort
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if interrupt != nil && interrupt.Load() {
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return nil
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}
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// Preload the touched accounts and storage slots in advance
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sender, err := types.Sender(signer, tx)
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if err != nil {
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fails.Add(1)
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return nil
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}
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reader.Account(sender)
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if tx.To() != nil {
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account, _ := reader.Account(*tx.To())
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// Preload the contract code if the destination has non-empty code
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if account != nil && !bytes.Equal(account.CodeHash, types.EmptyCodeHash.Bytes()) {
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reader.Code(*tx.To(), common.BytesToHash(account.CodeHash))
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}
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}
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for _, list := range tx.AccessList() {
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reader.Account(list.Address)
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if len(list.StorageKeys) > 0 {
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for _, slot := range list.StorageKeys {
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reader.Storage(list.Address, slot)
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}
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}
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}
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// Execute the message to preload the implicit touched states
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evm := vm.NewEVM(NewEVMBlockContext(header, p.chain, nil), stateCpy, p.config, cfg)
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// Convert the transaction into an executable message and pre-cache its sender
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msg, err := TransactionToMessage(tx, signer, header.BaseFee)
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if err != nil {
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fails.Add(1)
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return nil // Also invalid block, bail out
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}
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// Disable the nonce check
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msg.SkipNonceChecks = true
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stateCpy.SetTxContext(tx.Hash(), i)
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// We attempt to apply a transaction. The goal is not to execute
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// the transaction successfully, rather to warm up touched data slots.
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if _, err := ApplyMessage(evm, msg, new(GasPool).AddGas(block.GasLimit())); err != nil {
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fails.Add(1)
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return nil // Ugh, something went horribly wrong, bail out
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}
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return nil
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})
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}
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workers.Wait()
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blockPrefetchTxsValidMeter.Mark(int64(len(block.Transactions())) - fails.Load())
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blockPrefetchTxsInvalidMeter.Mark(fails.Load())
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return
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}
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