Allow cache_bench/db_bench to use a custom secondary cache (#8312)
Summary: This PR adds a ```-secondary_cache_uri``` option to the cache_bench and db_bench tools to allow the user to specify a custom secondary cache URI. The object registry is used to create an instance of the ```SecondaryCache``` object of the type specified in the URI. The main cache_bench code is packaged into a separate library, similar to db_bench. An example invocation of db_bench with a secondary cache URI - ```db_bench --env_uri=ws://ws.flash_sandbox.vll1_2/ -db=anand/nvm_cache_2 -use_existing_db=true -benchmarks=readrandom -num=30000000 -key_size=32 -value_size=256 -use_direct_reads=true -cache_size=67108864 -cache_index_and_filter_blocks=true -secondary_cache_uri='cachelibwrapper://filename=/home/anand76/nvm_cache/cache_file;size=2147483648;regionSize=16777216;admPolicy=random;admProbability=1.0;volatileSize=8388608;bktPower=20;lockPower=12' -partition_index_and_filters=true -duration=1800``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/8312 Reviewed By: zhichao-cao Differential Revision: D28544325 Pulled By: anand1976 fbshipit-source-id: 8f209b9af900c459dc42daa7a610d5f00176eeedmain
anand76
3 years ago
committed by
Facebook GitHub Bot
parent
871a2cb292
commit
13232e11d4
@ -1,528 +1,20 @@ |
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// Copyright (c) 2013-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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#include <cinttypes> |
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#include <cstdio> |
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#include <limits> |
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#include <set> |
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#include <sstream> |
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#include "monitoring/histogram.h" |
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#include "port/port.h" |
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#include "rocksdb/cache.h" |
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#include "rocksdb/db.h" |
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#include "rocksdb/env.h" |
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#include "rocksdb/system_clock.h" |
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#include "table/block_based/cachable_entry.h" |
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#include "util/coding.h" |
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#include "util/hash.h" |
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#include "util/mutexlock.h" |
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#include "util/random.h" |
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#include "util/stop_watch.h" |
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#include "util/string_util.h" |
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef GFLAGS |
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#include <cstdio> |
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int main() { |
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fprintf(stderr, "Please install gflags to run rocksdb tools\n"); |
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return 1; |
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} |
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#else |
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#include "util/gflags_compat.h" |
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using GFLAGS_NAMESPACE::ParseCommandLineFlags; |
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static constexpr uint32_t KiB = uint32_t{1} << 10; |
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static constexpr uint32_t MiB = KiB << 10; |
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static constexpr uint64_t GiB = MiB << 10; |
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DEFINE_uint32(threads, 16, "Number of concurrent threads to run."); |
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DEFINE_uint64(cache_size, 1 * GiB, |
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"Number of bytes to use as a cache of uncompressed data."); |
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DEFINE_uint32(num_shard_bits, 6, "shard_bits."); |
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DEFINE_double(resident_ratio, 0.25, |
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"Ratio of keys fitting in cache to keyspace."); |
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DEFINE_uint64(ops_per_thread, 2000000U, "Number of operations per thread."); |
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DEFINE_uint32(value_bytes, 8 * KiB, "Size of each value added."); |
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DEFINE_uint32(skew, 5, "Degree of skew in key selection"); |
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DEFINE_bool(populate_cache, true, "Populate cache before operations"); |
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DEFINE_uint32(lookup_insert_percent, 87, |
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"Ratio of lookup (+ insert on not found) to total workload " |
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"(expressed as a percentage)"); |
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DEFINE_uint32(insert_percent, 2, |
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"Ratio of insert to total workload (expressed as a percentage)"); |
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DEFINE_uint32(lookup_percent, 10, |
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"Ratio of lookup to total workload (expressed as a percentage)"); |
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DEFINE_uint32(erase_percent, 1, |
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"Ratio of erase to total workload (expressed as a percentage)"); |
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DEFINE_bool(gather_stats, false, |
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"Whether to periodically simulate gathering block cache stats, " |
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"using one more thread."); |
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DEFINE_uint32( |
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gather_stats_sleep_ms, 1000, |
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"How many milliseconds to sleep between each gathering of stats."); |
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DEFINE_uint32(gather_stats_entries_per_lock, 256, |
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"For Cache::ApplyToAllEntries"); |
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DEFINE_bool(use_clock_cache, false, ""); |
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namespace ROCKSDB_NAMESPACE { |
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class CacheBench; |
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namespace { |
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// State shared by all concurrent executions of the same benchmark.
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class SharedState { |
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public: |
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explicit SharedState(CacheBench* cache_bench) |
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: cv_(&mu_), |
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num_initialized_(0), |
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start_(false), |
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num_done_(0), |
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cache_bench_(cache_bench) {} |
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~SharedState() {} |
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port::Mutex* GetMutex() { |
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return &mu_; |
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} |
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port::CondVar* GetCondVar() { |
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return &cv_; |
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} |
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CacheBench* GetCacheBench() const { |
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return cache_bench_; |
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} |
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void IncInitialized() { |
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num_initialized_++; |
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} |
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void IncDone() { |
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num_done_++; |
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} |
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bool AllInitialized() const { return num_initialized_ >= FLAGS_threads; } |
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bool AllDone() const { return num_done_ >= FLAGS_threads; } |
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void SetStart() { |
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start_ = true; |
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} |
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bool Started() const { |
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return start_; |
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} |
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private: |
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port::Mutex mu_; |
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port::CondVar cv_; |
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uint64_t num_initialized_; |
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bool start_; |
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uint64_t num_done_; |
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CacheBench* cache_bench_; |
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}; |
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// Per-thread state for concurrent executions of the same benchmark.
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struct ThreadState { |
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uint32_t tid; |
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Random64 rnd; |
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SharedState* shared; |
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HistogramImpl latency_ns_hist; |
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uint64_t duration_us = 0; |
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ThreadState(uint32_t index, SharedState* _shared) |
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: tid(index), rnd(1000 + index), shared(_shared) {} |
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}; |
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struct KeyGen { |
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char key_data[27]; |
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Slice GetRand(Random64& rnd, uint64_t max_key) { |
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uint64_t raw = rnd.Next(); |
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// Skew according to setting
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for (uint32_t i = 0; i < FLAGS_skew; ++i) { |
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raw = std::min(raw, rnd.Next()); |
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} |
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uint64_t key = FastRange64(raw, max_key); |
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// Variable size and alignment
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size_t off = key % 8; |
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key_data[0] = char{42}; |
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EncodeFixed64(key_data + 1, key); |
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key_data[9] = char{11}; |
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EncodeFixed64(key_data + 10, key); |
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key_data[18] = char{4}; |
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EncodeFixed64(key_data + 19, key); |
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return Slice(&key_data[off], sizeof(key_data) - off); |
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} |
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}; |
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char* createValue(Random64& rnd) { |
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char* rv = new char[FLAGS_value_bytes]; |
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// Fill with some filler data, and take some CPU time
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for (uint32_t i = 0; i < FLAGS_value_bytes; i += 8) { |
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EncodeFixed64(rv + i, rnd.Next()); |
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} |
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return rv; |
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} |
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// Different deleters to simulate using deleter to gather
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// stats on the code origin and kind of cache entries.
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void deleter1(const Slice& /*key*/, void* value) { |
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delete[] static_cast<char*>(value); |
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} |
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void deleter2(const Slice& /*key*/, void* value) { |
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delete[] static_cast<char*>(value); |
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} |
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void deleter3(const Slice& /*key*/, void* value) { |
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delete[] static_cast<char*>(value); |
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} |
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} // namespace
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class CacheBench { |
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static constexpr uint64_t kHundredthUint64 = |
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std::numeric_limits<uint64_t>::max() / 100U; |
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public: |
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CacheBench() |
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: max_key_(static_cast<uint64_t>(FLAGS_cache_size / FLAGS_resident_ratio / |
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FLAGS_value_bytes)), |
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lookup_insert_threshold_(kHundredthUint64 * |
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FLAGS_lookup_insert_percent), |
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insert_threshold_(lookup_insert_threshold_ + |
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kHundredthUint64 * FLAGS_insert_percent), |
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lookup_threshold_(insert_threshold_ + |
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kHundredthUint64 * FLAGS_lookup_percent), |
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erase_threshold_(lookup_threshold_ + |
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kHundredthUint64 * FLAGS_erase_percent) { |
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if (erase_threshold_ != 100U * kHundredthUint64) { |
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fprintf(stderr, "Percentages must add to 100.\n"); |
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exit(1); |
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} |
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if (FLAGS_use_clock_cache) { |
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cache_ = NewClockCache(FLAGS_cache_size, FLAGS_num_shard_bits); |
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if (!cache_) { |
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fprintf(stderr, "Clock cache not supported.\n"); |
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exit(1); |
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} |
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} else { |
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cache_ = NewLRUCache(FLAGS_cache_size, FLAGS_num_shard_bits); |
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} |
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} |
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~CacheBench() {} |
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void PopulateCache() { |
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Random64 rnd(1); |
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KeyGen keygen; |
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for (uint64_t i = 0; i < 2 * FLAGS_cache_size; i += FLAGS_value_bytes) { |
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cache_->Insert(keygen.GetRand(rnd, max_key_), createValue(rnd), |
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FLAGS_value_bytes, &deleter1); |
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} |
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} |
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bool Run() { |
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const auto clock = SystemClock::Default().get(); |
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PrintEnv(); |
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SharedState shared(this); |
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std::vector<std::unique_ptr<ThreadState> > threads(FLAGS_threads); |
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for (uint32_t i = 0; i < FLAGS_threads; i++) { |
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threads[i].reset(new ThreadState(i, &shared)); |
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std::thread(ThreadBody, threads[i].get()).detach(); |
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} |
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HistogramImpl stats_hist; |
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std::string stats_report; |
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std::thread stats_thread(StatsBody, &shared, &stats_hist, &stats_report); |
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uint64_t start_time; |
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{ |
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MutexLock l(shared.GetMutex()); |
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while (!shared.AllInitialized()) { |
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shared.GetCondVar()->Wait(); |
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} |
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// Record start time
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start_time = clock->NowMicros(); |
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// Start all threads
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shared.SetStart(); |
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shared.GetCondVar()->SignalAll(); |
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// Wait threads to complete
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while (!shared.AllDone()) { |
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shared.GetCondVar()->Wait(); |
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} |
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} |
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// Stats gathering is considered background work. This time measurement
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// is for foreground work, and not really ideal for that. See below.
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uint64_t end_time = clock->NowMicros(); |
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stats_thread.join(); |
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// Wall clock time - includes idle time if threads
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// finish at different times (not ideal).
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double elapsed_secs = static_cast<double>(end_time - start_time) * 1e-6; |
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uint32_t ops_per_sec = static_cast<uint32_t>( |
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1.0 * FLAGS_threads * FLAGS_ops_per_thread / elapsed_secs); |
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printf("Complete in %.3f s; Rough parallel ops/sec = %u\n", elapsed_secs, |
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ops_per_sec); |
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// Total time in each thread (more accurate throughput measure)
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elapsed_secs = 0; |
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for (uint32_t i = 0; i < FLAGS_threads; i++) { |
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elapsed_secs += threads[i]->duration_us * 1e-6; |
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} |
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ops_per_sec = static_cast<uint32_t>(1.0 * FLAGS_threads * |
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FLAGS_ops_per_thread / elapsed_secs); |
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printf("Thread ops/sec = %u\n", ops_per_sec); |
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printf("\nOperation latency (ns):\n"); |
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HistogramImpl combined; |
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for (uint32_t i = 0; i < FLAGS_threads; i++) { |
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combined.Merge(threads[i]->latency_ns_hist); |
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} |
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printf("%s", combined.ToString().c_str()); |
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if (FLAGS_gather_stats) { |
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printf("\nGather stats latency (us):\n"); |
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printf("%s", stats_hist.ToString().c_str()); |
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} |
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printf("\n%s", stats_report.c_str()); |
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return true; |
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} |
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private: |
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std::shared_ptr<Cache> cache_; |
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const uint64_t max_key_; |
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// Cumulative thresholds in the space of a random uint64_t
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const uint64_t lookup_insert_threshold_; |
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const uint64_t insert_threshold_; |
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const uint64_t lookup_threshold_; |
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const uint64_t erase_threshold_; |
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// A benchmark version of gathering stats on an active block cache by
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// iterating over it. The primary purpose is to measure the impact of
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// gathering stats with ApplyToAllEntries on throughput- and
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// latency-sensitive Cache users. Performance of stats gathering is
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// also reported. The last set of gathered stats is also reported, for
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// manual sanity checking for logical errors or other unexpected
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// behavior of cache_bench or the underlying Cache.
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static void StatsBody(SharedState* shared, HistogramImpl* stats_hist, |
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std::string* stats_report) { |
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if (!FLAGS_gather_stats) { |
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return; |
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} |
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const auto clock = SystemClock::Default().get(); |
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uint64_t total_key_size = 0; |
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uint64_t total_charge = 0; |
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uint64_t total_entry_count = 0; |
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std::set<Cache::DeleterFn> deleters; |
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StopWatchNano timer(clock); |
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for (;;) { |
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uint64_t time; |
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time = clock->NowMicros(); |
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uint64_t deadline = time + uint64_t{FLAGS_gather_stats_sleep_ms} * 1000; |
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{ |
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MutexLock l(shared->GetMutex()); |
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for (;;) { |
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if (shared->AllDone()) { |
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std::ostringstream ostr; |
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ostr << "Most recent cache entry stats:\n" |
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<< "Number of entries: " << total_entry_count << "\n" |
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<< "Total charge: " << BytesToHumanString(total_charge) << "\n" |
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<< "Average key size: " |
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<< (1.0 * total_key_size / total_entry_count) << "\n" |
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<< "Average charge: " |
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<< BytesToHumanString(1.0 * total_charge / total_entry_count) |
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<< "\n" |
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<< "Unique deleters: " << deleters.size() << "\n"; |
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*stats_report = ostr.str(); |
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return; |
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} |
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if (clock->NowMicros() >= deadline) { |
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break; |
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} |
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uint64_t diff = deadline - std::min(clock->NowMicros(), deadline); |
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shared->GetCondVar()->TimedWait(diff + 1); |
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} |
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} |
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// Now gather stats, outside of mutex
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total_key_size = 0; |
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total_charge = 0; |
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total_entry_count = 0; |
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deleters.clear(); |
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auto fn = [&](const Slice& key, void* /*value*/, size_t charge, |
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Cache::DeleterFn deleter) { |
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total_key_size += key.size(); |
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total_charge += charge; |
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++total_entry_count; |
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// Something slightly more expensive as in (future) stats by category
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deleters.insert(deleter); |
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}; |
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timer.Start(); |
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Cache::ApplyToAllEntriesOptions opts; |
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opts.average_entries_per_lock = FLAGS_gather_stats_entries_per_lock; |
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shared->GetCacheBench()->cache_->ApplyToAllEntries(fn, opts); |
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stats_hist->Add(timer.ElapsedNanos() / 1000); |
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} |
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} |
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static void ThreadBody(ThreadState* thread) { |
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SharedState* shared = thread->shared; |
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{ |
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MutexLock l(shared->GetMutex()); |
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shared->IncInitialized(); |
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if (shared->AllInitialized()) { |
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shared->GetCondVar()->SignalAll(); |
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} |
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while (!shared->Started()) { |
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shared->GetCondVar()->Wait(); |
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} |
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} |
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thread->shared->GetCacheBench()->OperateCache(thread); |
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{ |
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MutexLock l(shared->GetMutex()); |
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shared->IncDone(); |
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if (shared->AllDone()) { |
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shared->GetCondVar()->SignalAll(); |
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} |
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} |
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} |
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void OperateCache(ThreadState* thread) { |
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// To use looked-up values
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uint64_t result = 0; |
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// To hold handles for a non-trivial amount of time
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Cache::Handle* handle = nullptr; |
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KeyGen gen; |
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const auto clock = SystemClock::Default().get(); |
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uint64_t start_time = clock->NowMicros(); |
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StopWatchNano timer(clock); |
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for (uint64_t i = 0; i < FLAGS_ops_per_thread; i++) { |
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timer.Start(); |
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Slice key = gen.GetRand(thread->rnd, max_key_); |
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uint64_t random_op = thread->rnd.Next(); |
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if (random_op < lookup_insert_threshold_) { |
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if (handle) { |
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cache_->Release(handle); |
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handle = nullptr; |
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} |
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// do lookup
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handle = cache_->Lookup(key); |
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if (handle) { |
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// do something with the data
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result += NPHash64(static_cast<char*>(cache_->Value(handle)), |
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FLAGS_value_bytes); |
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} else { |
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// do insert
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cache_->Insert(key, createValue(thread->rnd), FLAGS_value_bytes, |
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&deleter2, &handle); |
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} |
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} else if (random_op < insert_threshold_) { |
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if (handle) { |
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cache_->Release(handle); |
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handle = nullptr; |
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} |
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// do insert
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cache_->Insert(key, createValue(thread->rnd), FLAGS_value_bytes, |
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&deleter3, &handle); |
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} else if (random_op < lookup_threshold_) { |
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if (handle) { |
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cache_->Release(handle); |
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handle = nullptr; |
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} |
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// do lookup
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handle = cache_->Lookup(key); |
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if (handle) { |
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// do something with the data
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result += NPHash64(static_cast<char*>(cache_->Value(handle)), |
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FLAGS_value_bytes); |
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} |
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} else if (random_op < erase_threshold_) { |
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// do erase
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cache_->Erase(key); |
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} else { |
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// Should be extremely unlikely (noop)
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assert(random_op >= kHundredthUint64 * 100U); |
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} |
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thread->latency_ns_hist.Add(timer.ElapsedNanos()); |
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} |
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if (handle) { |
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cache_->Release(handle); |
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handle = nullptr; |
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} |
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// Ensure computations on `result` are not optimized away.
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if (result == 1) { |
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printf("You are extremely unlucky(2). Try again.\n"); |
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exit(1); |
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} |
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thread->duration_us = clock->NowMicros() - start_time; |
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} |
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void PrintEnv() const { |
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printf("RocksDB version : %d.%d\n", kMajorVersion, kMinorVersion); |
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printf("Number of threads : %u\n", FLAGS_threads); |
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printf("Ops per thread : %" PRIu64 "\n", FLAGS_ops_per_thread); |
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printf("Cache size : %s\n", |
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BytesToHumanString(FLAGS_cache_size).c_str()); |
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printf("Num shard bits : %u\n", FLAGS_num_shard_bits); |
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printf("Max key : %" PRIu64 "\n", max_key_); |
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printf("Resident ratio : %g\n", FLAGS_resident_ratio); |
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printf("Skew degree : %u\n", FLAGS_skew); |
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printf("Populate cache : %d\n", int{FLAGS_populate_cache}); |
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printf("Lookup+Insert pct : %u%%\n", FLAGS_lookup_insert_percent); |
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printf("Insert percentage : %u%%\n", FLAGS_insert_percent); |
||||
printf("Lookup percentage : %u%%\n", FLAGS_lookup_percent); |
||||
printf("Erase percentage : %u%%\n", FLAGS_erase_percent); |
||||
std::ostringstream stats; |
||||
if (FLAGS_gather_stats) { |
||||
stats << "enabled (" << FLAGS_gather_stats_sleep_ms << "ms, " |
||||
<< FLAGS_gather_stats_entries_per_lock << "/lock)"; |
||||
} else { |
||||
stats << "disabled"; |
||||
} |
||||
printf("Gather stats : %s\n", stats.str().c_str()); |
||||
printf("----------------------------\n"); |
||||
} |
||||
}; |
||||
} // namespace ROCKSDB_NAMESPACE
|
||||
|
||||
#include <rocksdb/cache_bench_tool.h> |
||||
int main(int argc, char** argv) { |
||||
ParseCommandLineFlags(&argc, &argv, true); |
||||
|
||||
if (FLAGS_threads <= 0) { |
||||
fprintf(stderr, "threads number <= 0\n"); |
||||
exit(1); |
||||
} |
||||
|
||||
ROCKSDB_NAMESPACE::CacheBench bench; |
||||
if (FLAGS_populate_cache) { |
||||
bench.PopulateCache(); |
||||
printf("Population complete\n"); |
||||
printf("----------------------------\n"); |
||||
} |
||||
if (bench.Run()) { |
||||
return 0; |
||||
} else { |
||||
return 1; |
||||
} |
||||
return ROCKSDB_NAMESPACE::cache_bench_tool(argc, argv); |
||||
} |
||||
|
||||
#endif // GFLAGS
|
||||
|
||||
@ -0,0 +1,573 @@ |
||||
// 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).
|
||||
|
||||
#ifdef GFLAGS |
||||
#include <cinttypes> |
||||
#include <cstdio> |
||||
#include <limits> |
||||
#include <set> |
||||
#include <sstream> |
||||
|
||||
#include "monitoring/histogram.h" |
||||
#include "port/port.h" |
||||
#include "rocksdb/cache.h" |
||||
#include "rocksdb/db.h" |
||||
#include "rocksdb/env.h" |
||||
#include "rocksdb/secondary_cache.h" |
||||
#include "rocksdb/system_clock.h" |
||||
#include "rocksdb/utilities/object_registry.h" |
||||
#include "table/block_based/cachable_entry.h" |
||||
#include "util/coding.h" |
||||
#include "util/gflags_compat.h" |
||||
#include "util/hash.h" |
||||
#include "util/mutexlock.h" |
||||
#include "util/random.h" |
||||
#include "util/stop_watch.h" |
||||
#include "util/string_util.h" |
||||
|
||||
using GFLAGS_NAMESPACE::ParseCommandLineFlags; |
||||
|
||||
static constexpr uint32_t KiB = uint32_t{1} << 10; |
||||
static constexpr uint32_t MiB = KiB << 10; |
||||
static constexpr uint64_t GiB = MiB << 10; |
||||
|
||||
DEFINE_uint32(threads, 16, "Number of concurrent threads to run."); |
||||
DEFINE_uint64(cache_size, 1 * GiB, |
||||
"Number of bytes to use as a cache of uncompressed data."); |
||||
DEFINE_uint32(num_shard_bits, 6, "shard_bits."); |
||||
|
||||
DEFINE_double(resident_ratio, 0.25, |
||||
"Ratio of keys fitting in cache to keyspace."); |
||||
DEFINE_uint64(ops_per_thread, 2000000U, "Number of operations per thread."); |
||||
DEFINE_uint32(value_bytes, 8 * KiB, "Size of each value added."); |
||||
|
||||
DEFINE_uint32(skew, 5, "Degree of skew in key selection"); |
||||
DEFINE_bool(populate_cache, true, "Populate cache before operations"); |
||||
|
||||
DEFINE_uint32(lookup_insert_percent, 87, |
||||
"Ratio of lookup (+ insert on not found) to total workload " |
||||
"(expressed as a percentage)"); |
||||
DEFINE_uint32(insert_percent, 2, |
||||
"Ratio of insert to total workload (expressed as a percentage)"); |
||||
DEFINE_uint32(lookup_percent, 10, |
||||
"Ratio of lookup to total workload (expressed as a percentage)"); |
||||
DEFINE_uint32(erase_percent, 1, |
||||
"Ratio of erase to total workload (expressed as a percentage)"); |
||||
DEFINE_bool(gather_stats, false, |
||||
"Whether to periodically simulate gathering block cache stats, " |
||||
"using one more thread."); |
||||
DEFINE_uint32( |
||||
gather_stats_sleep_ms, 1000, |
||||
"How many milliseconds to sleep between each gathering of stats."); |
||||
|
||||
DEFINE_uint32(gather_stats_entries_per_lock, 256, |
||||
"For Cache::ApplyToAllEntries"); |
||||
DEFINE_bool(skewed, false, "If true, skew the key access distribution"); |
||||
#ifndef ROCKSDB_LITE |
||||
DEFINE_string(secondary_cache_uri, "", |
||||
"Full URI for creating a custom secondary cache object"); |
||||
static class std::shared_ptr<ROCKSDB_NAMESPACE::SecondaryCache> secondary_cache; |
||||
#endif // ROCKSDB_LITE
|
||||
|
||||
DEFINE_bool(use_clock_cache, false, ""); |
||||
|
||||
namespace ROCKSDB_NAMESPACE { |
||||
|
||||
class CacheBench; |
||||
namespace { |
||||
// State shared by all concurrent executions of the same benchmark.
|
||||
class SharedState { |
||||
public: |
||||
explicit SharedState(CacheBench* cache_bench) |
||||
: cv_(&mu_), |
||||
num_initialized_(0), |
||||
start_(false), |
||||
num_done_(0), |
||||
cache_bench_(cache_bench) {} |
||||
|
||||
~SharedState() {} |
||||
|
||||
port::Mutex* GetMutex() { return &mu_; } |
||||
|
||||
port::CondVar* GetCondVar() { return &cv_; } |
||||
|
||||
CacheBench* GetCacheBench() const { return cache_bench_; } |
||||
|
||||
void IncInitialized() { num_initialized_++; } |
||||
|
||||
void IncDone() { num_done_++; } |
||||
|
||||
bool AllInitialized() const { return num_initialized_ >= FLAGS_threads; } |
||||
|
||||
bool AllDone() const { return num_done_ >= FLAGS_threads; } |
||||
|
||||
void SetStart() { start_ = true; } |
||||
|
||||
bool Started() const { return start_; } |
||||
|
||||
private: |
||||
port::Mutex mu_; |
||||
port::CondVar cv_; |
||||
|
||||
uint64_t num_initialized_; |
||||
bool start_; |
||||
uint64_t num_done_; |
||||
|
||||
CacheBench* cache_bench_; |
||||
}; |
||||
|
||||
// Per-thread state for concurrent executions of the same benchmark.
|
||||
struct ThreadState { |
||||
uint32_t tid; |
||||
Random64 rnd; |
||||
SharedState* shared; |
||||
HistogramImpl latency_ns_hist; |
||||
uint64_t duration_us = 0; |
||||
|
||||
ThreadState(uint32_t index, SharedState* _shared) |
||||
: tid(index), rnd(1000 + index), shared(_shared) {} |
||||
}; |
||||
|
||||
struct KeyGen { |
||||
char key_data[27]; |
||||
|
||||
Slice GetRand(Random64& rnd, uint64_t max_key, int max_log) { |
||||
uint64_t key = 0; |
||||
if (!FLAGS_skewed) { |
||||
uint64_t raw = rnd.Next(); |
||||
// Skew according to setting
|
||||
for (uint32_t i = 0; i < FLAGS_skew; ++i) { |
||||
raw = std::min(raw, rnd.Next()); |
||||
} |
||||
key = FastRange64(raw, max_key); |
||||
} else { |
||||
key = rnd.Skewed(max_log); |
||||
if (key > max_key) { |
||||
key -= max_key; |
||||
} |
||||
} |
||||
// Variable size and alignment
|
||||
size_t off = key % 8; |
||||
key_data[0] = char{42}; |
||||
EncodeFixed64(key_data + 1, key); |
||||
key_data[9] = char{11}; |
||||
EncodeFixed64(key_data + 10, key); |
||||
key_data[18] = char{4}; |
||||
EncodeFixed64(key_data + 19, key); |
||||
return Slice(&key_data[off], sizeof(key_data) - off); |
||||
} |
||||
}; |
||||
|
||||
char* createValue(Random64& rnd) { |
||||
char* rv = new char[FLAGS_value_bytes]; |
||||
// Fill with some filler data, and take some CPU time
|
||||
for (uint32_t i = 0; i < FLAGS_value_bytes; i += 8) { |
||||
EncodeFixed64(rv + i, rnd.Next()); |
||||
} |
||||
return rv; |
||||
} |
||||
|
||||
// Callbacks for secondary cache
|
||||
size_t SizeFn(void* /*obj*/) { return FLAGS_value_bytes; } |
||||
|
||||
Status SaveToFn(void* obj, size_t /*offset*/, size_t size, void* out) { |
||||
memcpy(out, obj, size); |
||||
return Status::OK(); |
||||
} |
||||
|
||||
// Different deleters to simulate using deleter to gather
|
||||
// stats on the code origin and kind of cache entries.
|
||||
void deleter1(const Slice& /*key*/, void* value) { |
||||
delete[] static_cast<char*>(value); |
||||
} |
||||
void deleter2(const Slice& /*key*/, void* value) { |
||||
delete[] static_cast<char*>(value); |
||||
} |
||||
void deleter3(const Slice& /*key*/, void* value) { |
||||
delete[] static_cast<char*>(value); |
||||
} |
||||
|
||||
Cache::CacheItemHelper helper1(SizeFn, SaveToFn, deleter1); |
||||
Cache::CacheItemHelper helper2(SizeFn, SaveToFn, deleter2); |
||||
Cache::CacheItemHelper helper3(SizeFn, SaveToFn, deleter3); |
||||
} // namespace
|
||||
|
||||
class CacheBench { |
||||
static constexpr uint64_t kHundredthUint64 = |
||||
std::numeric_limits<uint64_t>::max() / 100U; |
||||
|
||||
public: |
||||
CacheBench() |
||||
: max_key_(static_cast<uint64_t>(FLAGS_cache_size / FLAGS_resident_ratio / |
||||
FLAGS_value_bytes)), |
||||
lookup_insert_threshold_(kHundredthUint64 * |
||||
FLAGS_lookup_insert_percent), |
||||
insert_threshold_(lookup_insert_threshold_ + |
||||
kHundredthUint64 * FLAGS_insert_percent), |
||||
lookup_threshold_(insert_threshold_ + |
||||
kHundredthUint64 * FLAGS_lookup_percent), |
||||
erase_threshold_(lookup_threshold_ + |
||||
kHundredthUint64 * FLAGS_erase_percent), |
||||
skewed_(FLAGS_skewed) { |
||||
if (erase_threshold_ != 100U * kHundredthUint64) { |
||||
fprintf(stderr, "Percentages must add to 100.\n"); |
||||
exit(1); |
||||
} |
||||
|
||||
max_log_ = 0; |
||||
if (skewed_) { |
||||
uint64_t max_key = max_key_; |
||||
while (max_key >>= 1) max_log_++; |
||||
if (max_key > (1u << max_log_)) max_log_++; |
||||
} |
||||
|
||||
if (FLAGS_use_clock_cache) { |
||||
cache_ = NewClockCache(FLAGS_cache_size, FLAGS_num_shard_bits); |
||||
if (!cache_) { |
||||
fprintf(stderr, "Clock cache not supported.\n"); |
||||
exit(1); |
||||
} |
||||
} else { |
||||
LRUCacheOptions opts(FLAGS_cache_size, FLAGS_num_shard_bits, false, 0.5); |
||||
#ifndef ROCKSDB_LITE |
||||
if (!FLAGS_secondary_cache_uri.empty()) { |
||||
Status s = |
||||
ObjectRegistry::NewInstance()->NewSharedObject<SecondaryCache>( |
||||
FLAGS_secondary_cache_uri, &secondary_cache); |
||||
if (secondary_cache == nullptr) { |
||||
fprintf( |
||||
stderr, |
||||
"No secondary cache registered matching string: %s status=%s\n", |
||||
FLAGS_secondary_cache_uri.c_str(), s.ToString().c_str()); |
||||
exit(1); |
||||
} |
||||
opts.secondary_cache = secondary_cache; |
||||
} |
||||
#endif // ROCKSDB_LITE
|
||||
|
||||
cache_ = NewLRUCache(opts); |
||||
} |
||||
} |
||||
|
||||
~CacheBench() {} |
||||
|
||||
void PopulateCache() { |
||||
Random64 rnd(1); |
||||
KeyGen keygen; |
||||
for (uint64_t i = 0; i < 2 * FLAGS_cache_size; i += FLAGS_value_bytes) { |
||||
cache_->Insert(keygen.GetRand(rnd, max_key_, max_log_), createValue(rnd), |
||||
&helper1, FLAGS_value_bytes); |
||||
} |
||||
} |
||||
|
||||
bool Run() { |
||||
const auto clock = SystemClock::Default().get(); |
||||
|
||||
PrintEnv(); |
||||
SharedState shared(this); |
||||
std::vector<std::unique_ptr<ThreadState> > threads(FLAGS_threads); |
||||
for (uint32_t i = 0; i < FLAGS_threads; i++) { |
||||
threads[i].reset(new ThreadState(i, &shared)); |
||||
std::thread(ThreadBody, threads[i].get()).detach(); |
||||
} |
||||
|
||||
HistogramImpl stats_hist; |
||||
std::string stats_report; |
||||
std::thread stats_thread(StatsBody, &shared, &stats_hist, &stats_report); |
||||
|
||||
uint64_t start_time; |
||||
{ |
||||
MutexLock l(shared.GetMutex()); |
||||
while (!shared.AllInitialized()) { |
||||
shared.GetCondVar()->Wait(); |
||||
} |
||||
// Record start time
|
||||
start_time = clock->NowMicros(); |
||||
|
||||
// Start all threads
|
||||
shared.SetStart(); |
||||
shared.GetCondVar()->SignalAll(); |
||||
|
||||
// Wait threads to complete
|
||||
while (!shared.AllDone()) { |
||||
shared.GetCondVar()->Wait(); |
||||
} |
||||
} |
||||
|
||||
// Stats gathering is considered background work. This time measurement
|
||||
// is for foreground work, and not really ideal for that. See below.
|
||||
uint64_t end_time = clock->NowMicros(); |
||||
stats_thread.join(); |
||||
|
||||
// Wall clock time - includes idle time if threads
|
||||
// finish at different times (not ideal).
|
||||
double elapsed_secs = static_cast<double>(end_time - start_time) * 1e-6; |
||||
uint32_t ops_per_sec = static_cast<uint32_t>( |
||||
1.0 * FLAGS_threads * FLAGS_ops_per_thread / elapsed_secs); |
||||
printf("Complete in %.3f s; Rough parallel ops/sec = %u\n", elapsed_secs, |
||||
ops_per_sec); |
||||
|
||||
// Total time in each thread (more accurate throughput measure)
|
||||
elapsed_secs = 0; |
||||
for (uint32_t i = 0; i < FLAGS_threads; i++) { |
||||
elapsed_secs += threads[i]->duration_us * 1e-6; |
||||
} |
||||
ops_per_sec = static_cast<uint32_t>(1.0 * FLAGS_threads * |
||||
FLAGS_ops_per_thread / elapsed_secs); |
||||
printf("Thread ops/sec = %u\n", ops_per_sec); |
||||
|
||||
printf("\nOperation latency (ns):\n"); |
||||
HistogramImpl combined; |
||||
for (uint32_t i = 0; i < FLAGS_threads; i++) { |
||||
combined.Merge(threads[i]->latency_ns_hist); |
||||
} |
||||
printf("%s", combined.ToString().c_str()); |
||||
|
||||
if (FLAGS_gather_stats) { |
||||
printf("\nGather stats latency (us):\n"); |
||||
printf("%s", stats_hist.ToString().c_str()); |
||||
} |
||||
|
||||
printf("\n%s", stats_report.c_str()); |
||||
|
||||
return true; |
||||
} |
||||
|
||||
private: |
||||
std::shared_ptr<Cache> cache_; |
||||
const uint64_t max_key_; |
||||
// Cumulative thresholds in the space of a random uint64_t
|
||||
const uint64_t lookup_insert_threshold_; |
||||
const uint64_t insert_threshold_; |
||||
const uint64_t lookup_threshold_; |
||||
const uint64_t erase_threshold_; |
||||
const bool skewed_; |
||||
int max_log_; |
||||
|
||||
// A benchmark version of gathering stats on an active block cache by
|
||||
// iterating over it. The primary purpose is to measure the impact of
|
||||
// gathering stats with ApplyToAllEntries on throughput- and
|
||||
// latency-sensitive Cache users. Performance of stats gathering is
|
||||
// also reported. The last set of gathered stats is also reported, for
|
||||
// manual sanity checking for logical errors or other unexpected
|
||||
// behavior of cache_bench or the underlying Cache.
|
||||
static void StatsBody(SharedState* shared, HistogramImpl* stats_hist, |
||||
std::string* stats_report) { |
||||
if (!FLAGS_gather_stats) { |
||||
return; |
||||
} |
||||
const auto clock = SystemClock::Default().get(); |
||||
uint64_t total_key_size = 0; |
||||
uint64_t total_charge = 0; |
||||
uint64_t total_entry_count = 0; |
||||
std::set<Cache::DeleterFn> deleters; |
||||
StopWatchNano timer(clock); |
||||
|
||||
for (;;) { |
||||
uint64_t time; |
||||
time = clock->NowMicros(); |
||||
uint64_t deadline = time + uint64_t{FLAGS_gather_stats_sleep_ms} * 1000; |
||||
|
||||
{ |
||||
MutexLock l(shared->GetMutex()); |
||||
for (;;) { |
||||
if (shared->AllDone()) { |
||||
std::ostringstream ostr; |
||||
ostr << "Most recent cache entry stats:\n" |
||||
<< "Number of entries: " << total_entry_count << "\n" |
||||
<< "Total charge: " << BytesToHumanString(total_charge) << "\n" |
||||
<< "Average key size: " |
||||
<< (1.0 * total_key_size / total_entry_count) << "\n" |
||||
<< "Average charge: " |
||||
<< BytesToHumanString(1.0 * total_charge / total_entry_count) |
||||
<< "\n" |
||||
<< "Unique deleters: " << deleters.size() << "\n"; |
||||
*stats_report = ostr.str(); |
||||
return; |
||||
} |
||||
if (clock->NowMicros() >= deadline) { |
||||
break; |
||||
} |
||||
uint64_t diff = deadline - std::min(clock->NowMicros(), deadline); |
||||
shared->GetCondVar()->TimedWait(diff + 1); |
||||
} |
||||
} |
||||
|
||||
// Now gather stats, outside of mutex
|
||||
total_key_size = 0; |
||||
total_charge = 0; |
||||
total_entry_count = 0; |
||||
deleters.clear(); |
||||
auto fn = [&](const Slice& key, void* /*value*/, size_t charge, |
||||
Cache::DeleterFn deleter) { |
||||
total_key_size += key.size(); |
||||
total_charge += charge; |
||||
++total_entry_count; |
||||
// Something slightly more expensive as in (future) stats by category
|
||||
deleters.insert(deleter); |
||||
}; |
||||
timer.Start(); |
||||
Cache::ApplyToAllEntriesOptions opts; |
||||
opts.average_entries_per_lock = FLAGS_gather_stats_entries_per_lock; |
||||
shared->GetCacheBench()->cache_->ApplyToAllEntries(fn, opts); |
||||
stats_hist->Add(timer.ElapsedNanos() / 1000); |
||||
} |
||||
} |
||||
|
||||
static void ThreadBody(ThreadState* thread) { |
||||
SharedState* shared = thread->shared; |
||||
|
||||
{ |
||||
MutexLock l(shared->GetMutex()); |
||||
shared->IncInitialized(); |
||||
if (shared->AllInitialized()) { |
||||
shared->GetCondVar()->SignalAll(); |
||||
} |
||||
while (!shared->Started()) { |
||||
shared->GetCondVar()->Wait(); |
||||
} |
||||
} |
||||
thread->shared->GetCacheBench()->OperateCache(thread); |
||||
|
||||
{ |
||||
MutexLock l(shared->GetMutex()); |
||||
shared->IncDone(); |
||||
if (shared->AllDone()) { |
||||
shared->GetCondVar()->SignalAll(); |
||||
} |
||||
} |
||||
} |
||||
|
||||
void OperateCache(ThreadState* thread) { |
||||
// To use looked-up values
|
||||
uint64_t result = 0; |
||||
// To hold handles for a non-trivial amount of time
|
||||
Cache::Handle* handle = nullptr; |
||||
KeyGen gen; |
||||
const auto clock = SystemClock::Default().get(); |
||||
uint64_t start_time = clock->NowMicros(); |
||||
StopWatchNano timer(clock); |
||||
|
||||
for (uint64_t i = 0; i < FLAGS_ops_per_thread; i++) { |
||||
timer.Start(); |
||||
Slice key = gen.GetRand(thread->rnd, max_key_, max_log_); |
||||
uint64_t random_op = thread->rnd.Next(); |
||||
Cache::CreateCallback create_cb = |
||||
[](void* buf, size_t size, void** out_obj, size_t* charge) -> Status { |
||||
*out_obj = reinterpret_cast<void*>(new char[size]); |
||||
memcpy(*out_obj, buf, size); |
||||
*charge = size; |
||||
return Status::OK(); |
||||
}; |
||||
|
||||
if (random_op < lookup_insert_threshold_) { |
||||
if (handle) { |
||||
cache_->Release(handle); |
||||
handle = nullptr; |
||||
} |
||||
// do lookup
|
||||
handle = cache_->Lookup(key, &helper2, create_cb, Cache::Priority::LOW, |
||||
true); |
||||
if (handle) { |
||||
// do something with the data
|
||||
result += NPHash64(static_cast<char*>(cache_->Value(handle)), |
||||
FLAGS_value_bytes); |
||||
} else { |
||||
// do insert
|
||||
cache_->Insert(key, createValue(thread->rnd), &helper2, |
||||
FLAGS_value_bytes, &handle); |
||||
} |
||||
} else if (random_op < insert_threshold_) { |
||||
if (handle) { |
||||
cache_->Release(handle); |
||||
handle = nullptr; |
||||
} |
||||
// do insert
|
||||
cache_->Insert(key, createValue(thread->rnd), &helper3, |
||||
FLAGS_value_bytes, &handle); |
||||
} else if (random_op < lookup_threshold_) { |
||||
if (handle) { |
||||
cache_->Release(handle); |
||||
handle = nullptr; |
||||
} |
||||
// do lookup
|
||||
handle = cache_->Lookup(key, &helper2, create_cb, Cache::Priority::LOW, |
||||
true); |
||||
if (handle) { |
||||
// do something with the data
|
||||
result += NPHash64(static_cast<char*>(cache_->Value(handle)), |
||||
FLAGS_value_bytes); |
||||
} |
||||
} else if (random_op < erase_threshold_) { |
||||
// do erase
|
||||
cache_->Erase(key); |
||||
} else { |
||||
// Should be extremely unlikely (noop)
|
||||
assert(random_op >= kHundredthUint64 * 100U); |
||||
} |
||||
thread->latency_ns_hist.Add(timer.ElapsedNanos()); |
||||
} |
||||
if (handle) { |
||||
cache_->Release(handle); |
||||
handle = nullptr; |
||||
} |
||||
// Ensure computations on `result` are not optimized away.
|
||||
if (result == 1) { |
||||
printf("You are extremely unlucky(2). Try again.\n"); |
||||
exit(1); |
||||
} |
||||
thread->duration_us = clock->NowMicros() - start_time; |
||||
} |
||||
|
||||
void PrintEnv() const { |
||||
printf("RocksDB version : %d.%d\n", kMajorVersion, kMinorVersion); |
||||
printf("Number of threads : %u\n", FLAGS_threads); |
||||
printf("Ops per thread : %" PRIu64 "\n", FLAGS_ops_per_thread); |
||||
printf("Cache size : %s\n", |
||||
BytesToHumanString(FLAGS_cache_size).c_str()); |
||||
printf("Num shard bits : %u\n", FLAGS_num_shard_bits); |
||||
printf("Max key : %" PRIu64 "\n", max_key_); |
||||
printf("Resident ratio : %g\n", FLAGS_resident_ratio); |
||||
printf("Skew degree : %u\n", FLAGS_skew); |
||||
printf("Populate cache : %d\n", int{FLAGS_populate_cache}); |
||||
printf("Lookup+Insert pct : %u%%\n", FLAGS_lookup_insert_percent); |
||||
printf("Insert percentage : %u%%\n", FLAGS_insert_percent); |
||||
printf("Lookup percentage : %u%%\n", FLAGS_lookup_percent); |
||||
printf("Erase percentage : %u%%\n", FLAGS_erase_percent); |
||||
std::ostringstream stats; |
||||
if (FLAGS_gather_stats) { |
||||
stats << "enabled (" << FLAGS_gather_stats_sleep_ms << "ms, " |
||||
<< FLAGS_gather_stats_entries_per_lock << "/lock)"; |
||||
} else { |
||||
stats << "disabled"; |
||||
} |
||||
printf("Gather stats : %s\n", stats.str().c_str()); |
||||
printf("----------------------------\n"); |
||||
} |
||||
}; |
||||
|
||||
int cache_bench_tool(int argc, char** argv) { |
||||
ParseCommandLineFlags(&argc, &argv, true); |
||||
|
||||
if (FLAGS_threads <= 0) { |
||||
fprintf(stderr, "threads number <= 0\n"); |
||||
exit(1); |
||||
} |
||||
|
||||
ROCKSDB_NAMESPACE::CacheBench bench; |
||||
if (FLAGS_populate_cache) { |
||||
bench.PopulateCache(); |
||||
printf("Population complete\n"); |
||||
printf("----------------------------\n"); |
||||
} |
||||
if (bench.Run()) { |
||||
return 0; |
||||
} else { |
||||
return 1; |
||||
} |
||||
} // namespace ROCKSDB_NAMESPACE
|
||||
} // namespace ROCKSDB_NAMESPACE
|
||||
|
||||
#endif // GFLAGS
|
||||
@ -0,0 +1,14 @@ |
||||
// Copyright (c) 2013-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 "rocksdb/rocksdb_namespace.h" |
||||
#include "rocksdb/status.h" |
||||
#include "rocksdb/types.h" |
||||
|
||||
namespace ROCKSDB_NAMESPACE { |
||||
|
||||
int cache_bench_tool(int argc, char** argv); |
||||
} // namespace ROCKSDB_NAMESPACE
|
||||
Loading…
Reference in new issue