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Merge pull request #1151 from fjl/parallel-nonce-2

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core: re-add parallel nonce checks
This commit is contained in:
Jeffrey Wilcke 2015-06-03 09:12:06 -07:00
commit 71d9367edc
1 changed files with 49 additions and 67 deletions
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112
core/chain_manager.go
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@ -522,14 +522,15 @@ type queueEvent struct {
}
func (self *ChainManager) procFutureBlocks() {
blocks := []*types.Block{}
var blocks []*types.Block
self.futureBlocks.Each(func(i int, block *types.Block) {
blocks = append(blocks, block)
})
if len(blocks) > 0 {
types.BlockBy(types.Number).Sort(blocks)
self.InsertChain(blocks)
}
}
// InsertChain will attempt to insert the given chain in to the canonical chain or, otherwise, create a fork. It an error is returned
// it will return the index number of the failing block as well an error describing what went wrong (for possible errors see core/errors.go).
@ -540,17 +541,34 @@ func (self *ChainManager) InsertChain(chain types.Blocks) (int, error) {
self.chainmu.Lock()
defer self.chainmu.Unlock()
// A queued approach to delivering events. This is generally faster than direct delivery and requires much less mutex acquiring.
// A queued approach to delivering events. This is generally
// faster than direct delivery and requires much less mutex
// acquiring.
var (
queue = make([]interface{}, len(chain))
queueEvent = queueEvent{queue: queue}
stats struct{ queued, processed, ignored int }
tstart = time.Now()
nonceDone = make(chan nonceResult, len(chain))
nonceQuit = make(chan struct{})
nonceChecked = make([]bool, len(chain))
)
// Start the parallel nonce verifier.
go verifyNonces(self.pow, chain, nonceQuit, nonceDone)
defer close(nonceQuit)
for i, block := range chain {
if block == nil {
continue
// Wait for block i's nonce to be verified before processing
// its state transition.
for nonceChecked[i] {
r := <-nonceDone
nonceChecked[r.i] = true
if !r.valid {
block := chain[i]
return i, ValidationError("Block (#%v / %x) nonce is invalid (= %x)", block.Number(), block.Hash(), block.Nonce)
}
}
if BadHashes[block.Hash()] {
@ -559,10 +577,6 @@ func (self *ChainManager) InsertChain(chain types.Blocks) (int, error) {
return i, err
}
// create a nonce channel for parallisation of the nonce check
nonceErrCh := make(chan error)
go verifyBlockNonce(self.pow, block, nonceErrCh)
// Setting block.Td regardless of error (known for example) prevents errors down the line
// in the protocol handler
block.Td = new(big.Int).Set(CalcTD(block, self.GetBlock(block.ParentHash())))
@ -571,9 +585,6 @@ func (self *ChainManager) InsertChain(chain types.Blocks) (int, error) {
// all others will fail too (unless a known block is returned).
logs, err := self.processor.Process(block)
if err != nil {
// empty the nonce channel
<-nonceErrCh
if IsKnownBlockErr(err) {
stats.ignored++
continue
@ -597,11 +608,6 @@ func (self *ChainManager) InsertChain(chain types.Blocks) (int, error) {
return i, err
}
// Wait and check nonce channel and make sure it checks out fine
// otherwise return the error
if err := <-nonceErrCh; err != nil {
return i, err
}
cblock := self.currentBlock
// Compare the TD of the last known block in the canonical chain to make sure it's greater.
@ -776,66 +782,42 @@ func blockErr(block *types.Block, err error) {
h := block.Header()
glog.V(logger.Error).Infof("Bad block #%v (%x)\n", h.Number, h.Hash().Bytes())
glog.V(logger.Error).Infoln(err)
glog.V(logger.Debug).Infoln(block)
glog.V(logger.Debug).Infoln(verifyNonces)
}
// verifyNonces verifies nonces of the given blocks in parallel and returns
type nonceResult struct {
i int
valid bool
}
// block verifies nonces of the given blocks in parallel and returns
// an error if one of the blocks nonce verifications failed.
func verifyNonces(pow pow.PoW, blocks []*types.Block) error {
func verifyNonces(pow pow.PoW, blocks []*types.Block, quit <-chan struct{}, done chan<- nonceResult) {
// Spawn a few workers. They listen for blocks on the in channel
// and send results on done. The workers will exit in the
// background when in is closed.
var (
in = make(chan *types.Block)
done = make(chan error, runtime.GOMAXPROCS(0))
in = make(chan int)
nworkers = runtime.GOMAXPROCS(0)
)
defer close(in)
for i := 0; i < cap(done); i++ {
go verifyNonce(pow, in, done)
if len(blocks) < nworkers {
nworkers = len(blocks)
}
// Feed blocks to the workers, aborting at the first invalid nonce.
var (
running, i int
block *types.Block
sendin = in
)
for i < len(blocks) || running > 0 {
if i == len(blocks) {
// Disable sending to in.
sendin = nil
} else {
block = blocks[i]
i++
for i := 0; i < nworkers; i++ {
go func() {
for i := range in {
done <- nonceResult{i: i, valid: pow.Verify(blocks[i])}
}
}()
}
// Feed block indices to the workers.
for i := range blocks {
select {
case sendin <- block:
running++
case err := <-done:
running--
if err != nil {
return err
case in <- i:
continue
case <-quit:
return
}
}
}
return nil
}
// verifyNonce is a worker for the verifyNonces method. It will run until
// in is closed.
func verifyNonce(pow pow.PoW, in <-chan *types.Block, done chan<- error) {
for block := range in {
if !pow.Verify(block) {
done <- ValidationError("Block (#%v / %x) nonce is invalid (= %x)", block.Number(), block.Hash(), block.Nonce)
} else {
done <- nil
}
}
}
func verifyBlockNonce(pow pow.PoW, block *types.Block, done chan<- error) {
if !pow.Verify(block) {
done <- ValidationError("Block (#%v / %x) nonce is invalid (= %x)", block.Number(), block.Hash(), block.Nonce)
} else {
done <- nil
}
}