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trie: cache collapsed tries node, not rlp blobs (#16876)

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The current trie memory database/cache that we do pruning on stores
trie nodes as binary rlp encoded blobs, and also stores the node
relationships/references for GC purposes. However, most of the trie
nodes (everything apart from a value node) is in essence just a
collection of references.

This PR switches out the RLP encoded trie blobs with the
collapsed-but-not-serialized trie nodes. This permits most of the
references to be recovered from within the node data structure,
avoiding the need to track them a second time (expensive memory wise).
This commit is contained in:
Péter Szilágyi
2018-06-21 12:28:05 +03:00
committed by Felix Lange
parent 8db8d074e2
commit d926bf2c7e
8 changed files with 268 additions and 75 deletions
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6
eth/api_tracer.go
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@@ -297,7 +297,7 @@ func (api *PrivateDebugAPI) traceChain(ctx context.Context, start, end *types.Bl
database.TrieDB().Reference(root, common.Hash{})
}
// Dereference all past tries we ourselves are done working with
database.TrieDB().Dereference(proot, common.Hash{})
database.TrieDB().Dereference(proot)
proot = root
// TODO(karalabe): Do we need the preimages? Won't they accumulate too much?
@@ -320,7 +320,7 @@ func (api *PrivateDebugAPI) traceChain(ctx context.Context, start, end *types.Bl
done[uint64(result.Block)] = result
// Dereference any paret tries held in memory by this task
database.TrieDB().Dereference(res.rootref, common.Hash{})
database.TrieDB().Dereference(res.rootref)
// Stream completed traces to the user, aborting on the first error
for result, ok := done[next]; ok; result, ok = done[next] {
@@ -526,7 +526,7 @@ func (api *PrivateDebugAPI) computeStateDB(block *types.Block, reexec uint64) (*
return nil, err
}
database.TrieDB().Reference(root, common.Hash{})
database.TrieDB().Dereference(proot, common.Hash{})
database.TrieDB().Dereference(proot)
proot = root
}
nodes, imgs := database.TrieDB().Size()