async def _display_stats(self) -> None:
last_head = await self.wait(self.db.coro_get_canonical_head())
timer = Timer()
while self.is_operational:
await self.sleep(5)
self.logger.debug(
"(in progress, queued, max size) of headers, bodies, receipts: %r",
[(q.num_in_progress(), len(q), q._maxsize) for q in (
self.header_queue,
self._block_body_tasks,
self._receipt_tasks,
)],
)
head = await self.wait(self.db.coro_get_canonical_head())
if head == last_head:
continue
else:
block_num_change = head.block_number - last_head.block_number
last_head = head
self.logger.info(
"Advanced by %d blocks in %0.1f seconds, new head: #%d",
block_num_change, timer.pop_elapsed(), head.block_number)
class ChainSyncPerformanceTracker:
def __init__(self, head: BlockHeader) -> None:
# The `head` from the previous time we reported stats
self.prev_head = head
# The latest `head` we have synced
self.latest_head = head
# A `Timer` object to report elapsed time between reports
self.timer = Timer()
# EMA of the blocks per second
self.blocks_per_second_ema = EMA(initial_value=0,
smoothing_factor=0.05)
# EMA of the transactions per second
self.transactions_per_second_ema = EMA(initial_value=0,
smoothing_factor=0.05)
# Number of transactions processed
self.num_transactions = 0
def record_transactions(self, count: int) -> None:
self.num_transactions += count
def set_latest_head(self, head: BlockHeader) -> None:
self.latest_head = head
def report(self) -> ChainSyncStats:
elapsed = self.timer.pop_elapsed()
num_blocks = self.latest_head.block_number - self.prev_head.block_number
blocks_per_second = num_blocks / elapsed
transactions_per_second = self.num_transactions / elapsed
self.blocks_per_second_ema.update(blocks_per_second)
self.transactions_per_second_ema.update(transactions_per_second)
stats = ChainSyncStats(
prev_head=self.prev_head,
latest_head=self.latest_head,
elapsed=elapsed,
num_blocks=num_blocks,
blocks_per_second=self.blocks_per_second_ema.value,
num_transactions=self.num_transactions,
transactions_per_second=self.transactions_per_second_ema.value,
)
# reset the counters
self.num_transactions = 0
self.prev_head = self.latest_head
return stats