Options and methods for configuring and monitoring the transaction pool include:
txpool_pantheonTransactionsJSON-RPC API method to list transactions in the node transaction pool
--tx-pool-max-sizecommand line option to specify the maximum number of transactions in the node transaction pool
tx-pool-retention-hourscommand line option to specify the maximum number of hours to retain pending transactions in the transaction pool
Once full, the Pantheon transaction pool accepts and retains local transactions in preference to remote transactions. If the transaction pool is full of local transactions, the oldest local transactions are dropped first. That is, a full transaction pool continues to accept new local transactions by first dropping remote transactions and then by dropping the oldest local transactions.
Decreasing the maximum size of the transaction pool reduces memory use. If the network is busy and there is a backlog of transactions, increasing the size of the transaction pool reduces the risk of transactions being removed from the transaction pool.