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Merge bitcoin/bitcoin#32827: mempool: Avoid needless vtx iteration during IBD

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249889bee6 orphanage: avoid vtx iteration when no orphans (furszy)
41ad2be434 mempool: Avoid expensive loop in `removeForBlock` during IBD (Lőrinc)

Pull request description:

  During Initial Block Download, the mempool is usually empty, but `CTxMemPool::removeForBlock` is still called for every connected block where we:
  * iterate over every transaction in the block even though none will be found in the empty `mapTx`, always leaving `txs_removed_for_block` empty...
  * which is pre-allocated regardless with `40 bytes * vtx.size()`, even though it will always remain empty.

  Similarly to https://github.com/bitcoin/bitcoin/pull/32730#discussion_r2140691354, this change introduces a minor performance & memory optimization by only executing the loop if any of the affected mempool maps have any contents. The second commit is cherry-picked from there since it's related to this change as well.

ACKs for top commit:
  optout21:
    ACK 249889bee6
  glozow:
    ACK 249889bee6
  ismaelsadeeq:
    reACK 249889bee6

Tree-SHA512: 80d06ff1515164529cdc3ad21db3041bb5b2a1d4b72ba9e6884cdf40c5f1477fee7479944b8bca32a6f0bf27c4e5501fccd085f6041a2dbb101438629cfb9e4b
This commit is contained in:
merge-script
2025-07-21 11:01:12 -04:00
parent 11c6a864c9 249889bee6
commit 7129c9ea8e
2 changed files with 15 additions and 14 deletions
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2
src/node/txorphanage.cpp
View File

@@ -567,6 +567,8 @@ bool TxOrphanageImpl::HaveTxToReconsider(NodeId peer)
}
void TxOrphanageImpl::EraseForBlock(const CBlock& block)
{
if (m_orphans.empty()) return;
std::set<Wtxid> wtxids_to_erase;
for (const CTransactionRef& ptx : block.vtx) {
const CTransaction& block_tx = *ptx;

27
src/txmempool.cpp
View File

@@ -661,26 +661,25 @@ void CTxMemPool::removeConflicts(const CTransaction &tx)
}
}
/**
* Called when a block is connected. Removes from mempool.
*/
void CTxMemPool::removeForBlock(const std::vector<CTransactionRef>& vtx, unsigned int nBlockHeight)
{
// Remove confirmed txs and conflicts when a new block is connected, updating the fee logic
AssertLockHeld(cs);
Assume(!m_have_changeset);
std::vector<RemovedMempoolTransactionInfo> txs_removed_for_block;
txs_removed_for_block.reserve(vtx.size());
for (const auto& tx : vtx)
{
txiter it = mapTx.find(tx->GetHash());
if (it != mapTx.end()) {
setEntries stage;
stage.insert(it);
txs_removed_for_block.emplace_back(*it);
RemoveStaged(stage, true, MemPoolRemovalReason::BLOCK);
if (mapTx.size() || mapNextTx.size() || mapDeltas.size()) {
txs_removed_for_block.reserve(vtx.size());
for (const auto& tx : vtx) {
txiter it = mapTx.find(tx->GetHash());
if (it != mapTx.end()) {
setEntries stage;
stage.insert(it);
txs_removed_for_block.emplace_back(*it);
RemoveStaged(stage, true, MemPoolRemovalReason::BLOCK);
}
removeConflicts(*tx);
ClearPrioritisation(tx->GetHash());
}
removeConflicts(*tx);
ClearPrioritisation(tx->GetHash());
}
if (m_opts.signals) {
m_opts.signals->MempoolTransactionsRemovedForBlock(txs_removed_for_block, nBlockHeight);