// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. // This source code is licensed under both the GPLv2 (found in the // COPYING file in the root directory) and Apache 2.0 License // (found in the LICENSE.Apache file in the root directory). #pragma once #include #include #include #include "rocksdb/perf_level.h" namespace ROCKSDB_NAMESPACE { // A thread local context for gathering performance counter efficiently // and transparently. // Use SetPerfLevel(PerfLevel::kEnableTime) to enable time stats. // Break down performance counters by level and store per-level perf context in // PerfContextByLevel struct PerfContextByLevel { // # of times bloom filter has avoided file reads, i.e., negatives. uint64_t bloom_filter_useful = 0; // # of times bloom FullFilter has not avoided the reads. uint64_t bloom_filter_full_positive = 0; // # of times bloom FullFilter has not avoided the reads and data actually // exist. uint64_t bloom_filter_full_true_positive = 0; // total number of user key returned (only include keys that are found, does // not include keys that are deleted or merged without a final put uint64_t user_key_return_count = 0; // total nanos spent on reading data from SST files uint64_t get_from_table_nanos = 0; uint64_t block_cache_hit_count = 0; // total number of block cache hits uint64_t block_cache_miss_count = 0; // total number of block cache misses void Reset(); // reset all performance counters to zero }; struct PerfContext { ~PerfContext(); PerfContext() {} PerfContext(const PerfContext&); PerfContext& operator=(const PerfContext&); PerfContext(PerfContext&&) noexcept; void Reset(); // reset all performance counters to zero std::string ToString(bool exclude_zero_counters = false) const; // enable per level perf context and allocate storage for PerfContextByLevel void EnablePerLevelPerfContext(); // temporarily disable per level perf context by setting the flag to false void DisablePerLevelPerfContext(); // free the space for PerfContextByLevel, also disable per level perf context void ClearPerLevelPerfContext(); uint64_t user_key_comparison_count; // total number of user key comparisons uint64_t block_cache_hit_count; // total number of block cache hits uint64_t block_read_count; // total number of block reads (with IO) uint64_t block_read_byte; // total number of bytes from block reads uint64_t block_read_time; // total nanos spent on block reads uint64_t block_cache_index_hit_count; // total number of index block hits // total number of standalone handles lookup from secondary cache uint64_t block_cache_standalone_handle_count; // total number of real handles lookup from secondary cache that are inserted // into primary cache uint64_t block_cache_real_handle_count; uint64_t index_block_read_count; // total number of index block reads uint64_t block_cache_filter_hit_count; // total number of filter block hits uint64_t filter_block_read_count; // total number of filter block reads uint64_t compression_dict_block_read_count; // total number of compression // dictionary block reads uint64_t secondary_cache_hit_count; // total number of secondary cache hits // total number of real handles inserted into secondary cache uint64_t compressed_sec_cache_insert_real_count; // total number of dummy handles inserted into secondary cache uint64_t compressed_sec_cache_insert_dummy_count; // bytes for vals before compression in secondary cache uint64_t compressed_sec_cache_uncompressed_bytes; // bytes for vals after compression in secondary cache uint64_t compressed_sec_cache_compressed_bytes; uint64_t block_checksum_time; // total nanos spent on block checksum uint64_t block_decompress_time; // total nanos spent on block decompression uint64_t get_read_bytes; // bytes for vals returned by Get uint64_t multiget_read_bytes; // bytes for vals returned by MultiGet uint64_t iter_read_bytes; // bytes for keys/vals decoded by iterator uint64_t blob_cache_hit_count; // total number of blob cache hits uint64_t blob_read_count; // total number of blob reads (with IO) uint64_t blob_read_byte; // total number of bytes from blob reads uint64_t blob_read_time; // total nanos spent on blob reads uint64_t blob_checksum_time; // total nanos spent on blob checksum uint64_t blob_decompress_time; // total nanos spent on blob decompression // total number of internal keys skipped over during iteration. // There are several reasons for it: // 1. when calling Next(), the iterator is in the position of the previous // key, so that we'll need to skip it. It means this counter will always // be incremented in Next(). // 2. when calling Next(), we need to skip internal entries for the previous // keys that are overwritten. // 3. when calling Next(), Seek() or SeekToFirst(), after previous key // before calling Next(), the seek key in Seek() or the beginning for // SeekToFirst(), there may be one or more deleted keys before the next // valid key that the operation should place the iterator to. We need // to skip both of the tombstone and updates hidden by the tombstones. The // tombstones are not included in this counter, while previous updates // hidden by the tombstones will be included here. // 4. symmetric cases for Prev() and SeekToLast() // internal_recent_skipped_count is not included in this counter. // uint64_t internal_key_skipped_count; // Total number of deletes and single deletes skipped over during iteration // When calling Next(), Seek() or SeekToFirst(), after previous position // before calling Next(), the seek key in Seek() or the beginning for // SeekToFirst(), there may be one or more deleted keys before the next valid // key. Every deleted key is counted once. We don't recount here if there are // still older updates invalidated by the tombstones. // uint64_t internal_delete_skipped_count; // How many times iterators skipped over internal keys that are more recent // than the snapshot that iterator is using. // uint64_t internal_recent_skipped_count; // How many merge operands were fed into the merge operator by iterators. // Note: base values are not included in the count. // uint64_t internal_merge_count; // How many merge operands were fed into the merge operator by point lookups. // Note: base values are not included in the count. // uint64_t internal_merge_point_lookup_count; // Number of times we reseeked inside a merging iterator, specifically to skip // after or before a range of keys covered by a range deletion in a newer LSM // component. uint64_t internal_range_del_reseek_count; uint64_t get_snapshot_time; // total nanos spent on getting snapshot uint64_t get_from_memtable_time; // total nanos spent on querying memtables uint64_t get_from_memtable_count; // number of mem tables queried // total nanos spent after Get() finds a key uint64_t get_post_process_time; uint64_t get_from_output_files_time; // total nanos reading from output files // total nanos spent on seeking memtable uint64_t seek_on_memtable_time; // number of seeks issued on memtable // (including SeekForPrev but not SeekToFirst and SeekToLast) uint64_t seek_on_memtable_count; // number of Next()s issued on memtable uint64_t next_on_memtable_count; // number of Prev()s issued on memtable uint64_t prev_on_memtable_count; // total nanos spent on seeking child iters uint64_t seek_child_seek_time; // number of seek issued in child iterators uint64_t seek_child_seek_count; uint64_t seek_min_heap_time; // total nanos spent on the merge min heap uint64_t seek_max_heap_time; // total nanos spent on the merge max heap // total nanos spent on seeking the internal entries uint64_t seek_internal_seek_time; // total nanos spent on iterating internal entries to find the next user entry uint64_t find_next_user_entry_time; // This group of stats provide a breakdown of time spent by Write(). // May be inaccurate when 2PC, two_write_queues or enable_pipelined_write // are enabled. // // total nanos spent on writing to WAL uint64_t write_wal_time; // total nanos spent on writing to mem tables uint64_t write_memtable_time; // total nanos spent on delaying or throttling write uint64_t write_delay_time; // total nanos spent on switching memtable/wal and scheduling // flushes/compactions. uint64_t write_scheduling_flushes_compactions_time; // total nanos spent on writing a record, excluding the above four things uint64_t write_pre_and_post_process_time; // time spent waiting for other threads of the batch group uint64_t write_thread_wait_nanos; // time spent on acquiring DB mutex. uint64_t db_mutex_lock_nanos; // Time spent on waiting with a condition variable created with DB mutex. uint64_t db_condition_wait_nanos; // Time spent on merge operator. uint64_t merge_operator_time_nanos; // Time spent on reading index block from block cache or SST file uint64_t read_index_block_nanos; // Time spent on reading filter block from block cache or SST file uint64_t read_filter_block_nanos; // Time spent on creating data block iterator uint64_t new_table_block_iter_nanos; // Time spent on creating a iterator of an SST file. uint64_t new_table_iterator_nanos; // Time spent on seeking a key in data/index blocks uint64_t block_seek_nanos; // Time spent on finding or creating a table reader uint64_t find_table_nanos; // total number of mem table bloom hits uint64_t bloom_memtable_hit_count; // total number of mem table bloom misses uint64_t bloom_memtable_miss_count; // total number of SST table bloom hits uint64_t bloom_sst_hit_count; // total number of SST table bloom misses uint64_t bloom_sst_miss_count; // Time spent waiting on key locks in transaction lock manager. uint64_t key_lock_wait_time; // number of times acquiring a lock was blocked by another transaction. uint64_t key_lock_wait_count; // Total time spent in Env filesystem operations. These are only populated // when TimedEnv is used. uint64_t env_new_sequential_file_nanos; uint64_t env_new_random_access_file_nanos; uint64_t env_new_writable_file_nanos; uint64_t env_reuse_writable_file_nanos; uint64_t env_new_random_rw_file_nanos; uint64_t env_new_directory_nanos; uint64_t env_file_exists_nanos; uint64_t env_get_children_nanos; uint64_t env_get_children_file_attributes_nanos; uint64_t env_delete_file_nanos; uint64_t env_create_dir_nanos; uint64_t env_create_dir_if_missing_nanos; uint64_t env_delete_dir_nanos; uint64_t env_get_file_size_nanos; uint64_t env_get_file_modification_time_nanos; uint64_t env_rename_file_nanos; uint64_t env_link_file_nanos; uint64_t env_lock_file_nanos; uint64_t env_unlock_file_nanos; uint64_t env_new_logger_nanos; uint64_t get_cpu_nanos; uint64_t iter_next_cpu_nanos; uint64_t iter_prev_cpu_nanos; uint64_t iter_seek_cpu_nanos; // Time spent in encrypting data. Populated when EncryptedEnv is used. uint64_t encrypt_data_nanos; // Time spent in decrypting data. Populated when EncryptedEnv is used. uint64_t decrypt_data_nanos; uint64_t number_async_seek; std::map* level_to_perf_context = nullptr; bool per_level_perf_context_enabled = false; }; // If RocksDB is compiled with -DNPERF_CONTEXT, then a pointer to a global, // non-thread-local PerfContext object will be returned. Attempts to update // this object will be ignored, and reading from it will also be no-op. // Otherwise, // a) if thread-local is supported on the platform, then a pointer to // a thread-local PerfContext object will be returned. // b) if thread-local is NOT supported, then compilation will fail. // // This function never returns nullptr. PerfContext* get_perf_context(); } // namespace ROCKSDB_NAMESPACE