From d3dc2db9fb969a78cf04c680b8197cd35ea89902 Mon Sep 17 00:00:00 2001 From: Yueh-Hsuan Chiang <93241502+yhchiang-sol@users.noreply.github.com> Date: Sat, 21 May 2022 16:42:33 -0700 Subject: [PATCH] (LedgerStore) Rate-limit RocksDB perf sample by a minimum time interval (#25100) #### Problem The current RocksDB read/write perf metrics do not include the total operation nanos and thus we have to include all fields that might contribute to the total operation nanos. #### Summary of Changes This PR includes the total operation nanos in RocksDB's read/write perf and reduces the number of reported fields in its perf metric. --- ledger/src/blockstore_db.rs | 73 ++++++++++++++++++++++---------- ledger/src/blockstore_metrics.rs | 44 +++++++------------ 2 files changed, 66 insertions(+), 51 deletions(-) diff --git a/ledger/src/blockstore_db.rs b/ledger/src/blockstore_db.rs index 4dcdab9bc..6824caab8 100644 --- a/ledger/src/blockstore_db.rs +++ b/ledger/src/blockstore_db.rs @@ -542,17 +542,20 @@ impl Rocks { } fn write(&self, batch: RWriteBatch) -> Result<()> { - let is_perf_enabled = maybe_enable_rocksdb_perf( + let op_start_instant = maybe_enable_rocksdb_perf( self.column_options.rocks_perf_sample_interval, &self.write_batch_perf_status, ); let result = self.db.write(batch); - if is_perf_enabled { - report_rocksdb_write_perf(rocksdb_metric_header!( - "blockstore_rocksdb_write_perf,op=write_batch", - "write_batch", - self.column_options - )); + if let Some(op_start_instant) = op_start_instant { + report_rocksdb_write_perf( + &op_start_instant.elapsed(), + rocksdb_metric_header!( + "blockstore_rocksdb_write_perf,op=write_batch", + "write_batch", + self.column_options + ), + ); } match result { Ok(_) => Ok(()), @@ -1321,8 +1324,11 @@ where &self.read_perf_status, ); let result = self.backend.get_cf(self.handle(), &C::key(key)); - if is_perf_enabled { - report_rocksdb_read_perf(C::rocksdb_get_perf_metric_header(&self.column_options)); + if let Some(op_start_instant) = is_perf_enabled { + report_rocksdb_read_perf( + &op_start_instant.elapsed(), + C::rocksdb_get_perf_metric_header(&self.column_options), + ); } result } @@ -1399,8 +1405,11 @@ where &self.write_perf_status, ); let result = self.backend.put_cf(self.handle(), &C::key(key), value); - if is_perf_enabled { - report_rocksdb_write_perf(C::rocksdb_put_perf_metric_header(&self.column_options)); + if let Some(op_start_instant) = is_perf_enabled { + report_rocksdb_write_perf( + &op_start_instant.elapsed(), + C::rocksdb_put_perf_metric_header(&self.column_options), + ); } result } @@ -1431,8 +1440,11 @@ where result = Ok(Some(value)) } - if is_perf_enabled { - report_rocksdb_read_perf(C::rocksdb_get_perf_metric_header(&self.column_options)); + if let Some(op_start_instant) = is_perf_enabled { + report_rocksdb_read_perf( + &op_start_instant.elapsed(), + C::rocksdb_get_perf_metric_header(&self.column_options), + ); } result } @@ -1448,8 +1460,11 @@ where .backend .put_cf(self.handle(), &C::key(key), &serialized_value); - if is_perf_enabled { - report_rocksdb_write_perf(C::rocksdb_put_perf_metric_header(&self.column_options)); + if let Some(op_start_instant) = is_perf_enabled { + report_rocksdb_write_perf( + &op_start_instant.elapsed(), + C::rocksdb_put_perf_metric_header(&self.column_options), + ); } result } @@ -1460,8 +1475,11 @@ where &self.write_perf_status, ); let result = self.backend.delete_cf(self.handle(), &C::key(key)); - if is_perf_enabled { - report_rocksdb_write_perf(C::rocksdb_delete_perf_metric_header(&self.column_options)); + if let Some(op_start_instant) = is_perf_enabled { + report_rocksdb_write_perf( + &op_start_instant.elapsed(), + C::rocksdb_delete_perf_metric_header(&self.column_options), + ); } result } @@ -1480,8 +1498,11 @@ where &self.read_perf_status, ); let result = self.backend.get_cf(self.handle(), &C::key(key)); - if is_perf_enabled { - report_rocksdb_read_perf(C::rocksdb_get_perf_metric_header(&self.column_options)); + if let Some(op_start_instant) = is_perf_enabled { + report_rocksdb_read_perf( + &op_start_instant.elapsed(), + C::rocksdb_get_perf_metric_header(&self.column_options), + ); } if let Some(serialized_value) = result? { @@ -1501,8 +1522,11 @@ where &self.read_perf_status, ); let result = self.backend.get_cf(self.handle(), &C::key(key)); - if is_perf_enabled { - report_rocksdb_read_perf(C::rocksdb_get_perf_metric_header(&self.column_options)); + if let Some(op_start_instant) = is_perf_enabled { + report_rocksdb_read_perf( + &op_start_instant.elapsed(), + C::rocksdb_get_perf_metric_header(&self.column_options), + ); } if let Some(serialized_value) = result? { @@ -1521,8 +1545,11 @@ where &self.write_perf_status, ); let result = self.backend.put_cf(self.handle(), &C::key(key), &buf); - if is_perf_enabled { - report_rocksdb_write_perf(C::rocksdb_put_perf_metric_header(&self.column_options)); + if let Some(op_start_instant) = is_perf_enabled { + report_rocksdb_write_perf( + &op_start_instant.elapsed(), + C::rocksdb_put_perf_metric_header(&self.column_options), + ); } result diff --git a/ledger/src/blockstore_metrics.rs b/ledger/src/blockstore_metrics.rs index 41ea5815a..a52334b74 100644 --- a/ledger/src/blockstore_metrics.rs +++ b/ledger/src/blockstore_metrics.rs @@ -15,7 +15,7 @@ use { atomic::{AtomicU64, AtomicUsize, Ordering}, Arc, }, - time::Duration, + time::{Duration, Instant}, }, }; @@ -251,25 +251,27 @@ const PERF_SAMPLING_MIN_DURATION: Duration = Duration::from_secs(1); pub(crate) fn maybe_enable_rocksdb_perf( sample_interval: usize, perf_status: &PerfSamplingStatus, -) -> bool { +) -> Option { if perf_status.should_sample(sample_interval) { set_perf_stats(PerfStatsLevel::EnableTime); PER_THREAD_ROCKS_PERF_CONTEXT.with(|perf_context| { perf_context.borrow_mut().reset(); }); - return true; + return Some(Instant::now()); } - false + None } /// Reports the collected PerfContext and disables the PerfContext after /// reporting. -pub(crate) fn report_rocksdb_read_perf(metric_header: &'static str) { +pub(crate) fn report_rocksdb_read_perf(total_op_duration: &Duration, metric_header: &'static str) { PER_THREAD_ROCKS_PERF_CONTEXT.with(|perf_context_cell| { set_perf_stats(PerfStatsLevel::Disable); let perf_context = perf_context_cell.borrow(); datapoint_info!( metric_header, + // total nanos spent on the entire operation. + ("total_op_nanos", total_op_duration.as_nanos() as i64, i64), ( "user_key_comparison_count", perf_context.metric(PerfMetric::UserKeyComparisonCount) as i64, @@ -414,29 +416,13 @@ pub(crate) fn report_rocksdb_read_perf(metric_header: &'static str) { perf_context.metric(PerfMetric::KeyLockWaitCount) as i64, i64 ), + // nanos spent on file/directory operations. ( - "env_file_exists_nanos", - perf_context.metric(PerfMetric::EnvFileExistsNanos) as i64, - i64 - ), - ( - "env_get_children_nanos", - perf_context.metric(PerfMetric::EnvGetChildrenNanos) as i64, - i64 - ), - ( - "env_lock_file_nanos", - perf_context.metric(PerfMetric::EnvLockFileNanos) as i64, - i64 - ), - ( - "env_unlock_file_nanos", - perf_context.metric(PerfMetric::EnvUnlockFileNanos) as i64, - i64 - ), - ( - "total_metric_count", - perf_context.metric(PerfMetric::TotalMetricCount) as i64, + "env_file_ops_nanos", + (perf_context.metric(PerfMetric::EnvFileExistsNanos) + + perf_context.metric(PerfMetric::EnvGetChildrenNanos) + + perf_context.metric(PerfMetric::EnvLockFileNanos) + + perf_context.metric(PerfMetric::EnvUnlockFileNanos)) as i64, i64 ), ); @@ -444,12 +430,14 @@ pub(crate) fn report_rocksdb_read_perf(metric_header: &'static str) { } /// Reports the collected PerfContext and disables the PerfContext after /// reporting. -pub(crate) fn report_rocksdb_write_perf(metric_header: &'static str) { +pub(crate) fn report_rocksdb_write_perf(total_op_duration: &Duration, metric_header: &'static str) { PER_THREAD_ROCKS_PERF_CONTEXT.with(|perf_context_cell| { set_perf_stats(PerfStatsLevel::Disable); let perf_context = perf_context_cell.borrow(); datapoint_info!( metric_header, + // total nanos spent on the entire operation. + ("total_op_nanos", total_op_duration.as_nanos() as i64, i64), // total nanos spent on writing to WAL ( "write_wal_nanos",