TransactionScheduler: Scheduler Count and Timing metrics (#33893)
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ae4b62c6f5
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@ -197,20 +197,30 @@ impl PrioGraphScheduler {
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}
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/// Receive completed batches of transactions without blocking.
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/// Returns (num_transactions, num_retryable_transactions) on success.
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pub fn receive_completed(
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&mut self,
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container: &mut TransactionStateContainer,
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) -> Result<(), SchedulerError> {
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while self.try_receive_completed(container)? {}
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Ok(())
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) -> Result<(usize, usize), SchedulerError> {
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let mut total_num_transactions = 0;
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let mut total_num_retryable = 0;
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loop {
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let (num_transactions, num_retryable) = self.try_receive_completed(container)?;
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if num_transactions == 0 {
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break;
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}
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total_num_transactions += num_transactions;
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total_num_retryable += num_retryable;
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}
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Ok((total_num_transactions, total_num_retryable))
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}
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/// Receive completed batches of transactions.
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/// Returns `Ok(true)` if a batch was received, `Ok(false)` if no batch was received.
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/// Returns `Ok((num_transactions, num_retryable))` if a batch was received, `Ok((0, 0))` if no batch was received.
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fn try_receive_completed(
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&mut self,
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container: &mut TransactionStateContainer,
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) -> Result<bool, SchedulerError> {
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) -> Result<(usize, usize), SchedulerError> {
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match self.finished_consume_work_receiver.try_recv() {
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Ok(FinishedConsumeWork {
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work:
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@ -222,6 +232,9 @@ impl PrioGraphScheduler {
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},
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retryable_indexes,
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}) => {
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let num_transactions = ids.len();
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let num_retryable = retryable_indexes.len();
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// Free the locks
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self.complete_batch(batch_id, &transactions);
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@ -246,9 +259,9 @@ impl PrioGraphScheduler {
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container.remove_by_id(&id);
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}
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Ok(true)
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Ok((num_transactions, num_retryable))
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}
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Err(TryRecvError::Empty) => Ok(false),
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Err(TryRecvError::Empty) => Ok((0, 0)),
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Err(TryRecvError::Disconnected) => Err(SchedulerError::DisconnectedRecvChannel(
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"finished consume work",
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)),
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@ -15,7 +15,9 @@ use {
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TOTAL_BUFFERED_PACKETS,
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},
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crossbeam_channel::RecvTimeoutError,
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solana_measure::measure_us,
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solana_runtime::bank_forks::BankForks,
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solana_sdk::{saturating_add_assign, timing::AtomicInterval},
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std::{
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sync::{Arc, RwLock},
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time::Duration,
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@ -36,6 +38,10 @@ pub(crate) struct SchedulerController {
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container: TransactionStateContainer,
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/// State for scheduling and communicating with worker threads.
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scheduler: PrioGraphScheduler,
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/// Metrics tracking counts on transactions in different states.
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count_metrics: SchedulerCountMetrics,
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/// Metrics tracking time spent in different code sections.
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timing_metrics: SchedulerTimingMetrics,
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}
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impl SchedulerController {
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@ -52,6 +58,8 @@ impl SchedulerController {
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transaction_id_generator: TransactionIdGenerator::default(),
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container: TransactionStateContainer::with_capacity(TOTAL_BUFFERED_PACKETS),
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scheduler,
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count_metrics: SchedulerCountMetrics::default(),
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timing_metrics: SchedulerTimingMetrics::default(),
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}
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}
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@ -67,13 +75,21 @@ impl SchedulerController {
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// `Forward` will drop packets from the buffer instead of forwarding.
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// During receiving, since packets would be dropped from buffer anyway, we can
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// bypass sanitization and buffering and immediately drop the packets.
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let decision = self.decision_maker.make_consume_or_forward_decision();
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let (decision, decision_time_us) =
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measure_us!(self.decision_maker.make_consume_or_forward_decision());
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saturating_add_assign!(self.timing_metrics.decision_time_us, decision_time_us);
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self.process_transactions(&decision)?;
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self.scheduler.receive_completed(&mut self.container)?;
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if !self.receive_packets(&decision) {
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self.receive_completed()?;
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if !self.receive_and_buffer_packets(&decision) {
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break;
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}
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// Report metrics only if there is data.
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// Reset intervals when appropriate, regardless of report.
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let should_report = self.count_metrics.has_data();
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self.count_metrics.maybe_report_and_reset(should_report);
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self.timing_metrics.maybe_report_and_reset(should_report);
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}
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Ok(())
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@ -86,10 +102,14 @@ impl SchedulerController {
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) -> Result<(), SchedulerError> {
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match decision {
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BufferedPacketsDecision::Consume(_bank_start) => {
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let _num_scheduled = self.scheduler.schedule(&mut self.container)?;
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let (num_scheduled, schedule_time_us) =
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measure_us!(self.scheduler.schedule(&mut self.container)?);
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saturating_add_assign!(self.count_metrics.num_scheduled, num_scheduled);
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saturating_add_assign!(self.timing_metrics.schedule_time_us, schedule_time_us);
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}
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BufferedPacketsDecision::Forward => {
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self.clear_container();
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let (_, clear_time_us) = measure_us!(self.clear_container());
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saturating_add_assign!(self.timing_metrics.clear_time_us, clear_time_us);
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}
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BufferedPacketsDecision::ForwardAndHold | BufferedPacketsDecision::Hold => {}
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}
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@ -102,11 +122,25 @@ impl SchedulerController {
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fn clear_container(&mut self) {
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while let Some(id) = self.container.pop() {
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self.container.remove_by_id(&id.id);
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saturating_add_assign!(self.count_metrics.num_dropped_on_clear, 1);
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}
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}
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/// Receives completed transactions from the workers and updates metrics.
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fn receive_completed(&mut self) -> Result<(), SchedulerError> {
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let ((num_transactions, num_retryable), receive_completed_time_us) =
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measure_us!(self.scheduler.receive_completed(&mut self.container)?);
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saturating_add_assign!(self.count_metrics.num_finished, num_transactions);
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saturating_add_assign!(self.count_metrics.num_retryable, num_retryable);
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saturating_add_assign!(
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self.timing_metrics.receive_completed_time_us,
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receive_completed_time_us
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);
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Ok(())
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}
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/// Returns whether the packet receiver is still connected.
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fn receive_packets(&mut self, decision: &BufferedPacketsDecision) -> bool {
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fn receive_and_buffer_packets(&mut self, decision: &BufferedPacketsDecision) -> bool {
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let remaining_queue_capacity = self.container.remaining_queue_capacity();
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const MAX_PACKET_RECEIVE_TIME: Duration = Duration::from_millis(100);
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@ -125,17 +159,29 @@ impl SchedulerController {
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}
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};
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let received_packet_results = self
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let (received_packet_results, receive_time_us) = measure_us!(self
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.packet_receiver
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.receive_packets(recv_timeout, remaining_queue_capacity);
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.receive_packets(recv_timeout, remaining_queue_capacity));
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saturating_add_assign!(self.timing_metrics.receive_time_us, receive_time_us);
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match (received_packet_results, should_buffer) {
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(Ok(receive_packet_results), true) => {
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match received_packet_results {
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Ok(receive_packet_results) => {
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let num_received_packets = receive_packet_results.deserialized_packets.len();
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saturating_add_assign!(self.count_metrics.num_received, num_received_packets);
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if should_buffer {
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let (_, buffer_time_us) = measure_us!(
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self.buffer_packets(receive_packet_results.deserialized_packets)
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);
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saturating_add_assign!(self.timing_metrics.buffer_time_us, buffer_time_us);
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} else {
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saturating_add_assign!(
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self.count_metrics.num_dropped_on_receive,
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num_received_packets
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);
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}
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(Ok(receive_packet_results), false) => drop(receive_packet_results),
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(Err(RecvTimeoutError::Timeout), _) => {}
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(Err(RecvTimeoutError::Disconnected), _) => return false,
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}
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Err(RecvTimeoutError::Timeout) => {}
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Err(RecvTimeoutError::Disconnected) => return false,
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}
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true
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@ -151,6 +197,7 @@ impl SchedulerController {
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let Some(transaction) =
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packet.build_sanitized_transaction(feature_set, vote_only, bank.as_ref())
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else {
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saturating_add_assign!(self.count_metrics.num_dropped_on_sanitization, 1);
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continue;
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};
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@ -160,12 +207,148 @@ impl SchedulerController {
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max_age_slot: last_slot_in_epoch,
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};
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let transaction_priority_details = packet.priority_details();
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self.container.insert_new_transaction(
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if self.container.insert_new_transaction(
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transaction_id,
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transaction_ttl,
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transaction_priority_details,
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) {
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saturating_add_assign!(self.count_metrics.num_dropped_on_capacity, 1);
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}
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saturating_add_assign!(self.count_metrics.num_buffered, 1);
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}
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}
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}
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#[derive(Default)]
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struct SchedulerCountMetrics {
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interval: AtomicInterval,
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/// Number of packets received.
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num_received: usize,
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/// Number of packets buffered.
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num_buffered: usize,
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/// Number of transactions scheduled.
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num_scheduled: usize,
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/// Number of completed transactions received from workers.
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num_finished: usize,
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/// Number of transactions that were retryable.
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num_retryable: usize,
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/// Number of transactions that were immediately dropped on receive.
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num_dropped_on_receive: usize,
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/// Number of transactions that were dropped due to sanitization failure.
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num_dropped_on_sanitization: usize,
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/// Number of transactions that were dropped due to clearing.
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num_dropped_on_clear: usize,
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/// Number of transactions that were dropped due to exceeded capacity.
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num_dropped_on_capacity: usize,
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}
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impl SchedulerCountMetrics {
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fn maybe_report_and_reset(&mut self, should_report: bool) {
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const REPORT_INTERVAL_MS: u64 = 1000;
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if self.interval.should_update(REPORT_INTERVAL_MS) {
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if should_report {
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self.report();
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}
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self.reset();
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}
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}
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fn report(&self) {
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datapoint_info!(
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"banking_stage_scheduler_counts",
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("num_received", self.num_received, i64),
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("num_buffered", self.num_buffered, i64),
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("num_scheduled", self.num_scheduled, i64),
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("num_finished", self.num_finished, i64),
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("num_retryable", self.num_retryable, i64),
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("num_dropped_on_receive", self.num_dropped_on_receive, i64),
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(
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"num_dropped_on_sanitization",
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self.num_dropped_on_sanitization,
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i64
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),
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("num_dropped_on_clear", self.num_dropped_on_clear, i64),
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("num_dropped_on_capacity", self.num_dropped_on_capacity, i64)
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);
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}
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fn has_data(&self) -> bool {
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self.num_received != 0
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|| self.num_buffered != 0
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|| self.num_scheduled != 0
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|| self.num_finished != 0
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|| self.num_retryable != 0
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|| self.num_dropped_on_receive != 0
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|| self.num_dropped_on_sanitization != 0
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|| self.num_dropped_on_clear != 0
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|| self.num_dropped_on_capacity != 0
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}
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fn reset(&mut self) {
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self.num_received = 0;
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self.num_buffered = 0;
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self.num_scheduled = 0;
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self.num_finished = 0;
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self.num_retryable = 0;
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self.num_dropped_on_receive = 0;
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self.num_dropped_on_sanitization = 0;
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self.num_dropped_on_clear = 0;
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self.num_dropped_on_capacity = 0;
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}
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}
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#[derive(Default)]
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struct SchedulerTimingMetrics {
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interval: AtomicInterval,
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/// Time spent making processing decisions.
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decision_time_us: u64,
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/// Time spent receiving packets.
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receive_time_us: u64,
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/// Time spent buffering packets.
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buffer_time_us: u64,
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/// Time spent scheduling transactions.
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schedule_time_us: u64,
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/// Time spent clearing transactions from the container.
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clear_time_us: u64,
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/// Time spent receiving completed transactions.
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receive_completed_time_us: u64,
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}
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impl SchedulerTimingMetrics {
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fn maybe_report_and_reset(&mut self, should_report: bool) {
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const REPORT_INTERVAL_MS: u64 = 1000;
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if self.interval.should_update(REPORT_INTERVAL_MS) {
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if should_report {
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self.report();
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}
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self.reset();
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}
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}
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fn report(&self) {
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datapoint_info!(
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"banking_stage_scheduler_timing",
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("decision_time", self.decision_time_us, i64),
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("receive_time", self.receive_time_us, i64),
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("buffer_time", self.buffer_time_us, i64),
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("schedule_time", self.schedule_time_us, i64),
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("clear_time", self.clear_time_us, i64),
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(
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"receive_completed_time",
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self.receive_completed_time_us,
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i64
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)
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);
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}
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fn reset(&mut self) {
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self.receive_time_us = 0;
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self.buffer_time_us = 0;
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self.schedule_time_us = 0;
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self.receive_completed_time_us = 0;
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}
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}
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@ -119,12 +119,13 @@ impl TransactionStateContainer {
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}
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/// Insert a new transaction into the container's queues and maps.
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/// Returns `true` if a packet was dropped due to capacity limits.
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pub(crate) fn insert_new_transaction(
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&mut self,
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transaction_id: TransactionId,
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transaction_ttl: SanitizedTransactionTTL,
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transaction_priority_details: TransactionPriorityDetails,
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) {
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) -> bool {
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let priority_id =
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TransactionPriorityId::new(transaction_priority_details.priority, transaction_id);
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self.id_to_transaction_state.insert(
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@ -151,12 +152,15 @@ impl TransactionStateContainer {
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/// Pushes a transaction id into the priority queue. If the queue is full, the lowest priority
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/// transaction will be dropped (removed from the queue and map).
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pub(crate) fn push_id_into_queue(&mut self, priority_id: TransactionPriorityId) {
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/// Returns `true` if a packet was dropped due to capacity limits.
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pub(crate) fn push_id_into_queue(&mut self, priority_id: TransactionPriorityId) -> bool {
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if self.remaining_queue_capacity() == 0 {
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let popped_id = self.priority_queue.push_pop_min(priority_id);
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self.remove_by_id(&popped_id.id);
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true
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} else {
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self.priority_queue.push(priority_id);
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false
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}
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}
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