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opt: Tiebreak UTXOs by weight for CoinGrinder

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This commit is contained in:
Murch 2024-01-08 14:47:54 -05:00
parent 451be19dc1
commit 9124c73742
1 changed files with 14 additions and 2 deletions
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16
src/wallet/coinselection.cpp
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@ -37,6 +37,18 @@ struct {
}
} descending;
// Sort by descending (effective) value prefer lower weight on tie
struct {
bool operator()(const OutputGroup& a, const OutputGroup& b) const
{
if (a.GetSelectionAmount() == b.GetSelectionAmount()) {
// Sort lower weight to front on tied effective_value
return a.m_weight < b.m_weight;
}
return a.GetSelectionAmount() > b.GetSelectionAmount();
}
} descending_effval_weight;
/*
* This is the Branch and Bound Coin Selection algorithm designed by Murch. It searches for an input
* set that can pay for the spending target and does not exceed the spending target by more than the
@ -303,7 +315,7 @@ util::Result<SelectionResult> SelectCoinsBnB(std::vector<OutputGroup>& utxo_pool
* set in the node.
*
* @param std::vector<OutputGroup>& utxo_pool The UTXOs that we are choosing from. These UTXOs will be sorted in
* descending order by effective value, with lower waste preferred as a tie-breaker. (We can think of an output
* descending order by effective value, with lower weight preferred as a tie-breaker. (We can think of an output
* group with multiple as a heavier UTXO with the combined amount here.)
* @param const CAmount& selection_target This is the minimum amount that we need for the transaction without considering change.
* @param const CAmount& change_target The minimum budget for creating a change output, by which we increase the selection_target.
@ -312,7 +324,7 @@ util::Result<SelectionResult> SelectCoinsBnB(std::vector<OutputGroup>& utxo_pool
*/
util::Result<SelectionResult> CoinGrinder(std::vector<OutputGroup>& utxo_pool, const CAmount& selection_target, CAmount change_target, int max_weight)
{
std::sort(utxo_pool.begin(), utxo_pool.end(), descending);
std::sort(utxo_pool.begin(), utxo_pool.end(), descending_effval_weight);
// The sum of UTXO amounts after this UTXO index, e.g. lookahead[5] = Σ(UTXO[6+].amount)
std::vector<CAmount> lookahead(utxo_pool.size());