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Sort mempool by min(feerate, ancestor_feerate)

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This more closely approximates the desirability of a given transaction for
mining.
This commit is contained in:
Suhas Daftuar 2018-01-09 12:27:57 -05:00
parent 6773f92b30
commit 9a51319578
1 changed files with 26 additions and 7 deletions
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33
src/txmempool.h
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@ -266,27 +266,46 @@ public:
} }
}; };
/** \class CompareTxMemPoolEntryByAncestorScore
*
* Sort an entry by min(score/size of entry's tx, score/size with all ancestors).
*/
class CompareTxMemPoolEntryByAncestorFee class CompareTxMemPoolEntryByAncestorFee
{ {
public: public:
bool operator()(const CTxMemPoolEntry& a, const CTxMemPoolEntry& b) const bool operator()(const CTxMemPoolEntry& a, const CTxMemPoolEntry& b) const
{ {
double aFees = a.GetModFeesWithAncestors(); double a_mod_fee, a_size, b_mod_fee, b_size;
double aSize = a.GetSizeWithAncestors();
double bFees = b.GetModFeesWithAncestors(); GetModFeeAndSize(a, a_mod_fee, a_size);
double bSize = b.GetSizeWithAncestors(); GetModFeeAndSize(b, b_mod_fee, b_size);
// Avoid division by rewriting (a/b > c/d) as (a*d > c*b). // Avoid division by rewriting (a/b > c/d) as (a*d > c*b).
double f1 = aFees * bSize; double f1 = a_mod_fee * b_size;
double f2 = aSize * bFees; double f2 = a_size * b_mod_fee;
if (f1 == f2) { if (f1 == f2) {
return a.GetTx().GetHash() < b.GetTx().GetHash(); return a.GetTx().GetHash() < b.GetTx().GetHash();
} }
return f1 > f2; return f1 > f2;
} }
// Return the fee/size we're using for sorting this entry.
void GetModFeeAndSize(const CTxMemPoolEntry &a, double &mod_fee, double &size) const
{
// Compare feerate with ancestors to feerate of the transaction, and
// return the fee/size for the min.
double f1 = (double)a.GetModifiedFee() * a.GetSizeWithAncestors();
double f2 = (double)a.GetModFeesWithAncestors() * a.GetTxSize();
if (f1 > f2) {
mod_fee = a.GetModFeesWithAncestors();
size = a.GetSizeWithAncestors();
} else {
mod_fee = a.GetModifiedFee();
size = a.GetTxSize();
}
}
}; };
// Multi_index tag names // Multi_index tag names