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core, eth, trie: streaming GC for the trie cache (#16810)

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* core, eth, trie: streaming GC for the trie cache

* trie: track memcache statistics
This commit is contained in:
Péter Szilágyi
2018-06-04 10:47:43 +03:00
committed by GitHub
parent 3f33a7c8ce
commit 143c4341d8
4 changed files with 202 additions and 38 deletions
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42
core/blockchain.go
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@ -674,7 +674,7 @@ func (bc *BlockChain) Stop() {
for !bc.triegc.Empty() {
triedb.Dereference(bc.triegc.PopItem().(common.Hash), common.Hash{})
}
if size := triedb.Size(); size != 0 {
if size, _ := triedb.Size(); size != 0 {
log.Error("Dangling trie nodes after full cleanup")
}
}
@ -916,33 +916,29 @@ func (bc *BlockChain) WriteBlockWithState(block *types.Block, receipts []*types.
bc.triegc.Push(root, -float32(block.NumberU64()))
if current := block.NumberU64(); current > triesInMemory {
// If we exceeded our memory allowance, flush matured singleton nodes to disk
var (
nodes, imgs = triedb.Size()
limit = common.StorageSize(bc.cacheConfig.TrieNodeLimit) * 1024 * 1024
)
if nodes > limit || imgs > 4*1024*1024 {
triedb.Cap(limit - ethdb.IdealBatchSize)
}
// Find the next state trie we need to commit
header := bc.GetHeaderByNumber(current - triesInMemory)
chosen := header.Number.Uint64()
// Only write to disk if we exceeded our memory allowance *and* also have at
// least a given number of tries gapped.
var (
size = triedb.Size()
limit = common.StorageSize(bc.cacheConfig.TrieNodeLimit) * 1024 * 1024
)
if size > limit || bc.gcproc > bc.cacheConfig.TrieTimeLimit {
// If we exceeded out time allowance, flush an entire trie to disk
if bc.gcproc > bc.cacheConfig.TrieTimeLimit {
// If we're exceeding limits but haven't reached a large enough memory gap,
// warn the user that the system is becoming unstable.
if chosen < lastWrite+triesInMemory {
switch {
case size >= 2*limit:
log.Warn("State memory usage too high, committing", "size", size, "limit", limit, "optimum", float64(chosen-lastWrite)/triesInMemory)
case bc.gcproc >= 2*bc.cacheConfig.TrieTimeLimit:
log.Info("State in memory for too long, committing", "time", bc.gcproc, "allowance", bc.cacheConfig.TrieTimeLimit, "optimum", float64(chosen-lastWrite)/triesInMemory)
}
}
// If optimum or critical limits reached, write to disk
if chosen >= lastWrite+triesInMemory || size >= 2*limit || bc.gcproc >= 2*bc.cacheConfig.TrieTimeLimit {
triedb.Commit(header.Root, true)
lastWrite = chosen
bc.gcproc = 0
if chosen < lastWrite+triesInMemory && bc.gcproc >= 2*bc.cacheConfig.TrieTimeLimit {
log.Info("State in memory for too long, committing", "time", bc.gcproc, "allowance", bc.cacheConfig.TrieTimeLimit, "optimum", float64(chosen-lastWrite)/triesInMemory)
}
// Flush an entire trie and restart the counters
triedb.Commit(header.Root, true)
lastWrite = chosen
bc.gcproc = 0
}
// Garbage collect anything below our required write retention
for !bc.triegc.Empty() {
@ -1181,7 +1177,9 @@ func (bc *BlockChain) insertChain(chain types.Blocks) (int, []interface{}, []*ty
}
stats.processed++
stats.usedGas += usedGas
stats.report(chain, i, bc.stateCache.TrieDB().Size())
cache, _ := bc.stateCache.TrieDB().Size()
stats.report(chain, i, cache)
}
// Append a single chain head event if we've progressed the chain
if lastCanon != nil && bc.CurrentBlock().Hash() == lastCanon.Hash() {