/usr/include/rocksdb/perf_context.h is in librocksdb-dev 4.5.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | // Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#ifndef STORAGE_ROCKSDB_INCLUDE_PERF_CONTEXT_H
#define STORAGE_ROCKSDB_INCLUDE_PERF_CONTEXT_H
#include <stdint.h>
#include <string>
#include "rocksdb/perf_level.h"
namespace rocksdb {
// A thread local context for gathering performance counter efficiently
// and transparently.
// Use SetPerfLevel(PerfLevel::kEnableTime) to enable time stats.
struct PerfContext {
void Reset(); // reset all performance counters to zero
std::string ToString(bool exclude_zero_counters = false) const;
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_checksum_time; // total nanos spent on block checksum
uint64_t block_decompress_time; // total nanos spent on block decompression
// total number of internal keys skipped over during iteration (overwritten or
// deleted, to be more specific, hidden by a put or delete of the same key)
uint64_t internal_key_skipped_count;
// total number of deletes and single deletes skipped over during iteration
uint64_t internal_delete_skipped_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
uint64_t seek_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 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;
// 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 write
uint64_t write_delay_time;
// total nanos spent on writing a record, excluding the above three times
uint64_t write_pre_and_post_process_time;
uint64_t db_mutex_lock_nanos; // time spent on acquiring DB mutex.
// 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;
};
#if defined(NPERF_CONTEXT) || defined(IOS_CROSS_COMPILE)
extern PerfContext perf_context;
#elif _WIN32
extern __declspec(thread) PerfContext perf_context;
#else
extern __thread PerfContext perf_context;
#endif
}
#endif
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