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(LedgerStore) Enable performance sampling in column family get() (#23834)

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#### Summary of Changes
This PR enables RocksDB read side performance metrics to report to blockstore_rocksdb_read_perf.
The sampling rate is controlled by an env arg `SOLANA_METRICS_ROCKSDB_PERF_SAMPLES_IN_1K`,
specifies the number of perf samples for every 1000 operations.  The default value is set to 10, meaning
we will report 10 out of 1000 (or 1/100) reads.

The metrics are based on the RocksDB [PerfContext](https://github.com/facebook/rocksdb/blob/main/include/rocksdb/perf_context.h).
It includes many useful metrics including block read time, cache hit rate, and time spent on decompressing the block.
This commit is contained in:
Yueh-Hsuan Chiang
2022-04-01 13:13:32 -07:00
committed by GitHub
parent c9a476e24d
commit 0b5ed87220
2 changed files with 363 additions and 5 deletions
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4
core/src/ledger_metric_report_service.rs
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@ -13,7 +13,9 @@ use {
},
};
// Determines how often we report blockstore metrics.
// Determines how often we report blockstore metrics under
// LedgerMetricReportService. Note that there're other blockstore
// metrics that are reported outside LedgerMetricReportService.
const BLOCKSTORE_METRICS_REPORT_PERIOD_MILLIS: u64 = 10000;
pub struct LedgerMetricReportService {