fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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97 lines
3.2 KiB
97 lines
3.2 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <stdint.h>
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#include <string>
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#include "rocksdb/perf_level.h"
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// A thread local context for gathering io-stats efficiently and transparently.
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// Use SetPerfLevel(PerfLevel::kEnableTime) to enable time stats.
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namespace ROCKSDB_NAMESPACE {
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// EXPERIMENTAL: the IO statistics for tiered storage. It matches with each
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// item in Temperature class.
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struct FileIOByTemperature {
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// the number of bytes read to Temperature::kHot file
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uint64_t hot_file_bytes_read;
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// the number of bytes read to Temperature::kWarm file
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uint64_t warm_file_bytes_read;
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// the number of bytes read to Temperature::kCold file
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uint64_t cold_file_bytes_read;
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// total number of reads to Temperature::kHot file
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uint64_t hot_file_read_count;
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// total number of reads to Temperature::kWarm file
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uint64_t warm_file_read_count;
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// total number of reads to Temperature::kCold file
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uint64_t cold_file_read_count;
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// reset all the statistics to 0.
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void Reset() {
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hot_file_bytes_read = 0;
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warm_file_bytes_read = 0;
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cold_file_bytes_read = 0;
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hot_file_read_count = 0;
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warm_file_read_count = 0;
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cold_file_read_count = 0;
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}
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};
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struct IOStatsContext {
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// reset all io-stats counter to zero
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void Reset();
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std::string ToString(bool exclude_zero_counters = false) const;
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// the thread pool id
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uint64_t thread_pool_id;
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// number of bytes that has been written.
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uint64_t bytes_written;
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// number of bytes that has been read.
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uint64_t bytes_read;
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// time spent in open() and fopen().
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uint64_t open_nanos;
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// time spent in fallocate().
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uint64_t allocate_nanos;
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// time spent in write() and pwrite().
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uint64_t write_nanos;
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// time spent in read() and pread()
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uint64_t read_nanos;
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// time spent in sync_file_range().
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uint64_t range_sync_nanos;
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// time spent in fsync
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uint64_t fsync_nanos;
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// time spent in preparing write (fallocate etc).
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uint64_t prepare_write_nanos;
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// time spent in Logger::Logv().
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uint64_t logger_nanos;
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// CPU time spent in write() and pwrite()
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uint64_t cpu_write_nanos;
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// CPU time spent in read() and pread()
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uint64_t cpu_read_nanos;
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FileIOByTemperature file_io_stats_by_temperature;
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// It is not consistent that whether iostats follows PerfLevel.Timer counters
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// follows it but BackupEngine relies on counter metrics to always be there.
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// Here we create a backdoor option to disable some counters, so that some
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// existing stats are not polluted by file operations, such as logging, by
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// turning this off.
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bool disable_iostats = false;
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};
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// If RocksDB is compiled with -DNIOSTATS_CONTEXT, then a pointer to a global,
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// non-thread-local IOStatsContext object will be returned. Attempts to update
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// this object will be ignored, and reading from it will also be no-op.
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// Otherwise, a pointer to a thread-local IOStatsContext object will be
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// returned.
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//
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// This function never returns nullptr.
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IOStatsContext* get_iostats_context();
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} // namespace ROCKSDB_NAMESPACE
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