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trie: approximate the wasted cache metaspace closer

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Péter Szilágyi 2018-11-22 14:09:04 +02:00
parent 2843001ac2
commit 6845265643
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GPG key ID: E9AE538CEDF8293D
1 changed files with 16 additions and 6 deletions
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22
trie/database.go
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@ -86,7 +86,7 @@ type Database struct {
flushnodes uint64 // Nodes flushed since last commit
flushsize common.StorageSize // Data storage flushed since last commit
dirtiesSize common.StorageSize // Storage size of the dirty node cache (exc. flushlist)
dirtiesSize common.StorageSize // Storage size of the dirty node cache (exc. metadata)
preimagesSize common.StorageSize // Storage size of the preimages cache
lock sync.RWMutex
@ -148,6 +148,16 @@ type cachedNode struct {
flushNext common.Hash // Next node in the flush-list
}
// cachedNodeSize is the raw size of a cachedNode data structure without any
// node data included. It's an approximate size, but should be a lot better
// than not counting them.
const cachedNodeSize = 0 +
8 + // node interface pointer
4 + // byte size of the cached data
8 + // number of referencing nodes
48 + // empty map of external children
2*common.HashLength // previous and next node in flushlist
// rlp returns the raw rlp encoded blob of the cached node, either directly from
// the cache, or by regenerating it from the collapsed node.
func (n *cachedNode) rlp() []byte {
@ -569,8 +579,8 @@ func (db *Database) Cap(limit common.StorageSize) error {
// db.dirtiesSize only contains the useful data in the cache, but when reporting
// the total memory consumption, the maintenance metadata is also needed to be
// counted. For every useful node, we track 2 extra hashes as the flushlist.
size := db.dirtiesSize + common.StorageSize((len(db.dirties)-1)*2*common.HashLength)
// counted.
size := db.dirtiesSize + common.StorageSize((len(db.dirties)-1)*cachedNodeSize)
// If the preimage cache got large enough, push to disk. If it's still small
// leave for later to deduplicate writes.
@ -789,9 +799,9 @@ func (db *Database) Size() (common.StorageSize, common.StorageSize) {
// db.dirtiesSize only contains the useful data in the cache, but when reporting
// the total memory consumption, the maintenance metadata is also needed to be
// counted. For every useful node, we track 2 extra hashes as the flushlist.
var flushlistSize = common.StorageSize((len(db.dirties) - 1) * 2 * common.HashLength)
return db.dirtiesSize + flushlistSize, db.preimagesSize
// counted.
var metadataSize = common.StorageSize((len(db.dirties) - 1) * cachedNodeSize)
return db.dirtiesSize + metadataSize, db.preimagesSize
}
// verifyIntegrity is a debug method to iterate over the entire trie stored in