04298f8c33
Summary: Add helper function to print perf context data in db_bench if enabled. I didn't find any code that actually exports perf context data. Not sure if I missed anything Test Plan: ran db_bench Reviewers: haobo, sdong, igor Reviewed By: igor CC: leveldb Differential Revision: https://reviews.facebook.net/D16575
72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#ifndef STORAGE_ROCKSDB_INCLUDE_PERF_CONTEXT_H
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#define STORAGE_ROCKSDB_INCLUDE_PERF_CONTEXT_H
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#include <stdint.h>
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#include <string>
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namespace rocksdb {
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enum PerfLevel {
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kDisable = 0, // disable perf stats
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kEnableCount = 1, // enable only count stats
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kEnableTime = 2 // enable time stats too
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};
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// set the perf stats level
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void SetPerfLevel(PerfLevel level);
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// A thread local context for gathering performance counter efficiently
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// and transparently.
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struct PerfContext {
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void Reset(); // reset all performance counters to zero
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std::string ToString() const;
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uint64_t user_key_comparison_count; // total number of user key comparisons
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uint64_t block_cache_hit_count; // total number of block cache hits
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uint64_t block_read_count; // total number of block reads (with IO)
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uint64_t block_read_byte; // total number of bytes from block reads
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uint64_t block_read_time; // total time spent on block reads
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uint64_t block_checksum_time; // total time spent on block checksum
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uint64_t block_decompress_time; // total time spent on block decompression
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// total number of internal keys skipped over during iteration (overwritten or
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// deleted, to be more specific, hidden by a put or delete of the same key)
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uint64_t internal_key_skipped_count;
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// total number of deletes skipped over during iteration
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uint64_t internal_delete_skipped_count;
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uint64_t get_snapshot_time; // total time spent on getting snapshot
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uint64_t get_from_memtable_time; // total time spent on querying memtables
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uint64_t get_from_memtable_count; // number of mem tables queried
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// total time spent after Get() finds a key
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uint64_t get_post_process_time;
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uint64_t get_from_output_files_time; // total time reading from output files
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// total time spent on seeking child iters
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uint64_t seek_child_seek_time;
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// number of seek issued in child iterators
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uint64_t seek_child_seek_count;
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uint64_t seek_min_heap_time; // total time spent on the merge heap
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// total time spent on seeking the internal entries
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uint64_t seek_internal_seek_time;
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// total time spent on iterating internal entries to find the next user entry
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uint64_t find_next_user_entry_time;
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// total time spent on pre or post processing when writing a record
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uint64_t write_pre_and_post_process_time;
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uint64_t write_wal_time; // total time spent on writing to WAL
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// total time spent on writing to mem tables
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uint64_t write_memtable_time;
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};
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extern __thread PerfContext perf_context;
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}
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#endif
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