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core: speed up header import (#21967)

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This PR implements the following modifications

- Don't shortcut check if block is present, thus avoid disk lookup
- Don't check hash ancestry in early-check (it's still done in parallel checker)
- Don't check time.Now for every single header

Charts and background info can be found here: https://github.com/holiman/headerimport/blob/main/README.md
With these changes, writing 1M headers goes down to from 80s to 62s.
This commit is contained in:
Martin Holst Swende
2021-01-26 12:17:11 +01:00
committed by GitHub
parent 14d495491d
commit 681618275c
3 changed files with 28 additions and 24 deletions
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36
consensus/ethash/consensus.go
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@ -39,11 +39,11 @@ import (
// Ethash proof-of-work protocol constants.
var (
FrontierBlockReward = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
ByzantiumBlockReward = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Byzantium
ConstantinopleBlockReward = big.NewInt(2e+18) // Block reward in wei for successfully mining a block upward from Constantinople
maxUncles = 2 // Maximum number of uncles allowed in a single block
allowedFutureBlockTime = 15 * time.Second // Max time from current time allowed for blocks, before they're considered future blocks
FrontierBlockReward = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
ByzantiumBlockReward = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Byzantium
ConstantinopleBlockReward = big.NewInt(2e+18) // Block reward in wei for successfully mining a block upward from Constantinople
maxUncles = 2 // Maximum number of uncles allowed in a single block
allowedFutureBlockTimeSeconds = int64(15) // Max seconds from current time allowed for blocks, before they're considered future blocks
// calcDifficultyEip2384 is the difficulty adjustment algorithm as specified by EIP 2384.
// It offsets the bomb 4M blocks from Constantinople, so in total 9M blocks.
@ -102,7 +102,7 @@ func (ethash *Ethash) VerifyHeader(chain consensus.ChainHeaderReader, header *ty
return consensus.ErrUnknownAncestor
}
// Sanity checks passed, do a proper verification
return ethash.verifyHeader(chain, header, parent, false, seal)
return ethash.verifyHeader(chain, header, parent, false, seal, time.Now().Unix())
}
// VerifyHeaders is similar to VerifyHeader, but verifies a batch of headers
@ -126,15 +126,16 @@ func (ethash *Ethash) VerifyHeaders(chain consensus.ChainHeaderReader, headers [
// Create a task channel and spawn the verifiers
var (
inputs = make(chan int)
done = make(chan int, workers)
errors = make([]error, len(headers))
abort = make(chan struct{})
inputs = make(chan int)
done = make(chan int, workers)
errors = make([]error, len(headers))
abort = make(chan struct{})
unixNow = time.Now().Unix()
)
for i := 0; i < workers; i++ {
go func() {
for index := range inputs {
errors[index] = ethash.verifyHeaderWorker(chain, headers, seals, index)
errors[index] = ethash.verifyHeaderWorker(chain, headers, seals, index, unixNow)
done <- index
}
}()
@ -170,7 +171,7 @@ func (ethash *Ethash) VerifyHeaders(chain consensus.ChainHeaderReader, headers [
return abort, errorsOut
}
func (ethash *Ethash) verifyHeaderWorker(chain consensus.ChainHeaderReader, headers []*types.Header, seals []bool, index int) error {
func (ethash *Ethash) verifyHeaderWorker(chain consensus.ChainHeaderReader, headers []*types.Header, seals []bool, index int, unixNow int64) error {
var parent *types.Header
if index == 0 {
parent = chain.GetHeader(headers[0].ParentHash, headers[0].Number.Uint64()-1)
@ -180,10 +181,7 @@ func (ethash *Ethash) verifyHeaderWorker(chain consensus.ChainHeaderReader, head
if parent == nil {
return consensus.ErrUnknownAncestor
}
if chain.GetHeader(headers[index].Hash(), headers[index].Number.Uint64()) != nil {
return nil // known block
}
return ethash.verifyHeader(chain, headers[index], parent, false, seals[index])
return ethash.verifyHeader(chain, headers[index], parent, false, seals[index], unixNow)
}
// VerifyUncles verifies that the given block's uncles conform to the consensus
@ -234,7 +232,7 @@ func (ethash *Ethash) VerifyUncles(chain consensus.ChainReader, block *types.Blo
if ancestors[uncle.ParentHash] == nil || uncle.ParentHash == block.ParentHash() {
return errDanglingUncle
}
if err := ethash.verifyHeader(chain, uncle, ancestors[uncle.ParentHash], true, true); err != nil {
if err := ethash.verifyHeader(chain, uncle, ancestors[uncle.ParentHash], true, true, time.Now().Unix()); err != nil {
return err
}
}
@ -244,14 +242,14 @@ func (ethash *Ethash) VerifyUncles(chain consensus.ChainReader, block *types.Blo
// verifyHeader checks whether a header conforms to the consensus rules of the
// stock Ethereum ethash engine.
// See YP section 4.3.4. "Block Header Validity"
func (ethash *Ethash) verifyHeader(chain consensus.ChainHeaderReader, header, parent *types.Header, uncle bool, seal bool) error {
func (ethash *Ethash) verifyHeader(chain consensus.ChainHeaderReader, header, parent *types.Header, uncle bool, seal bool, unixNow int64) error {
// Ensure that the header's extra-data section is of a reasonable size
if uint64(len(header.Extra)) > params.MaximumExtraDataSize {
return fmt.Errorf("extra-data too long: %d > %d", len(header.Extra), params.MaximumExtraDataSize)
}
// Verify the header's timestamp
if !uncle {
if header.Time > uint64(time.Now().Add(allowedFutureBlockTime).Unix()) {
if header.Time > uint64(unixNow+allowedFutureBlockTimeSeconds) {
return consensus.ErrFutureBlock
}
}