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Allow cache_bench and db_bench to use 3rd party tiered cache

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This commit is contained in:
anand76 2021-04-20 21:33:09 -07:00
parent e295344ae3
commit 09df74c540
14 changed files with 667 additions and 456 deletions
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3
CMakeLists.txt
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@ -1315,7 +1315,8 @@ if(WITH_BENCHMARK_TOOLS)
${ROCKSDB_LIB} ${THIRDPARTY_LIBS}) ${ROCKSDB_LIB} ${THIRDPARTY_LIBS})
add_executable(cache_bench${ARTIFACT_SUFFIX} add_executable(cache_bench${ARTIFACT_SUFFIX}
cache/cache_bench.cc) cache/cache_bench.cc
cache/cache_bench_tool.cc)
target_link_libraries(cache_bench${ARTIFACT_SUFFIX} target_link_libraries(cache_bench${ARTIFACT_SUFFIX}
${ROCKSDB_LIB} ${GFLAGS_LIB}) ${ROCKSDB_LIB} ${GFLAGS_LIB})

5
Makefile
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@ -511,12 +511,13 @@ VALGRIND_OPTS = --error-exitcode=$(VALGRIND_ERROR) --leak-check=full
TEST_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(TEST_LIB_SOURCES) $(MOCK_LIB_SOURCES)) $(GTEST) TEST_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(TEST_LIB_SOURCES) $(MOCK_LIB_SOURCES)) $(GTEST)
BENCH_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(BENCH_LIB_SOURCES)) BENCH_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(BENCH_LIB_SOURCES))
CACHE_BENCH_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(CACHE_BENCH_LIB_SOURCES))
TOOL_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(TOOL_LIB_SOURCES)) TOOL_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(TOOL_LIB_SOURCES))
ANALYZE_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(ANALYZER_LIB_SOURCES)) ANALYZE_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(ANALYZER_LIB_SOURCES))
STRESS_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(STRESS_LIB_SOURCES)) STRESS_OBJECTS = $(patsubst %.cc, $(OBJ_DIR)/%.o, $(STRESS_LIB_SOURCES))
ALL_SOURCES = $(LIB_SOURCES) $(TEST_LIB_SOURCES) $(MOCK_LIB_SOURCES) $(GTEST_DIR)/gtest/gtest-all.cc ALL_SOURCES = $(LIB_SOURCES) $(TEST_LIB_SOURCES) $(MOCK_LIB_SOURCES) $(GTEST_DIR)/gtest/gtest-all.cc
ALL_SOURCES += $(TOOL_LIB_SOURCES) $(BENCH_LIB_SOURCES) $(ANALYZER_LIB_SOURCES) $(STRESS_LIB_SOURCES) ALL_SOURCES += $(TOOL_LIB_SOURCES) $(BENCH_LIB_SOURCES) $(CACHE_BENCH_LIB_SOURCES) $(ANALYZER_LIB_SOURCES) $(STRESS_LIB_SOURCES)
ALL_SOURCES += $(TEST_MAIN_SOURCES) $(TOOL_MAIN_SOURCES) $(BENCH_MAIN_SOURCES) ALL_SOURCES += $(TEST_MAIN_SOURCES) $(TOOL_MAIN_SOURCES) $(BENCH_MAIN_SOURCES)
TESTS = $(patsubst %.cc, %, $(notdir $(TEST_MAIN_SOURCES))) TESTS = $(patsubst %.cc, %, $(notdir $(TEST_MAIN_SOURCES)))
@ -1462,7 +1463,7 @@ folly_synchronization_distributed_mutex_test: $(OBJ_DIR)/third-party/folly/folly
$(AM_LINK) $(AM_LINK)
endif endif
cache_bench: $(OBJ_DIR)/cache/cache_bench.o $(LIBRARY) cache_bench: $(OBJ_DIR)/cache/cache_bench.o $(CACHE_BENCH_OBJECTS) $(LIBRARY)
$(AM_LINK) $(AM_LINK)
persistent_cache_bench: $(OBJ_DIR)/utilities/persistent_cache/persistent_cache_bench.o $(LIBRARY) persistent_cache_bench: $(OBJ_DIR)/utilities/persistent_cache/persistent_cache_bench.o $(LIBRARY)

14
TARGETS
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@ -784,6 +784,20 @@ cpp_library(
link_whole = False, link_whole = False,
) )
cpp_library(
name = "rocksdb_cache_bench_tools_lib",
srcs = ["cache/cache_bench_tool.cc"],
auto_headers = AutoHeaders.RECURSIVE_GLOB,
arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
compiler_flags = ROCKSDB_COMPILER_FLAGS,
os_deps = ROCKSDB_OS_DEPS,
os_preprocessor_flags = ROCKSDB_OS_PREPROCESSOR_FLAGS,
preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
deps = [":rocksdb_lib"],
external_deps = ROCKSDB_EXTERNAL_DEPS,
link_whole = False,
)
cpp_library( cpp_library(
name = "rocksdb_stress_lib", name = "rocksdb_stress_lib",
srcs = [ srcs = [

5
buckifier/buckify_rocksdb.py
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@ -169,6 +169,11 @@ def generate_targets(repo_path, deps_map):
src_mk.get("ANALYZER_LIB_SOURCES", []) + src_mk.get("ANALYZER_LIB_SOURCES", []) +
["test_util/testutil.cc"], ["test_util/testutil.cc"],
[":rocksdb_lib"]) [":rocksdb_lib"])
# rocksdb_cache_bench_tools_lib
TARGETS.add_library(
"rocksdb_cache_bench_tools_lib",
src_mk.get("CACHE_BENCH_LIB_SOURCES", []),
[":rocksdb_lib"])
# rocksdb_stress_lib # rocksdb_stress_lib
TARGETS.add_rocksdb_library( TARGETS.add_rocksdb_library(
"rocksdb_stress_lib", "rocksdb_stress_lib",

377
cache/cache_bench.cc vendored
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@ -1,7 +1,11 @@
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. // Copyright (c) 2013-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the // This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License // COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory). // (found in the LICENSE.Apache file in the root directory).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef GFLAGS #ifndef GFLAGS
#include <cstdio> #include <cstdio>
@ -10,375 +14,8 @@ int main() {
return 1; return 1;
} }
#else #else
#include <rocksdb/cache_bench_tool.h>
#include <sys/types.h>
#include <cinttypes>
#include <cstdio>
#include <limits>
#include "port/port.h"
#include "rocksdb/cache.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/system_clock.h"
#include "util/coding.h"
#include "util/gflags_compat.h"
#include "util/hash.h"
#include "util/mutexlock.h"
#include "util/random.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, 0,
"Number of operations per thread. (Default: 5 * keyspace size)");
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(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;
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) {
uint64_t raw = rnd.Next();
// Skew according to setting
for (uint32_t i = 0; i < FLAGS_skew; ++i) {
raw = std::min(raw, rnd.Next());
}
uint64_t key = FastRange64(raw, 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;
}
void deleter(const Slice& /*key*/, void* value) {
delete[] static_cast<char*>(value);
}
} // 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) {
if (erase_threshold_ != 100U * kHundredthUint64) {
fprintf(stderr, "Percentages must add to 100.\n");
exit(1);
}
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 {
cache_ = NewLRUCache(FLAGS_cache_size, FLAGS_num_shard_bits);
}
if (FLAGS_ops_per_thread == 0) {
FLAGS_ops_per_thread = 5 * max_key_;
}
}
~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_), createValue(rnd),
FLAGS_value_bytes, &deleter);
}
}
bool Run() {
ROCKSDB_NAMESPACE::Env* env = ROCKSDB_NAMESPACE::Env::Default();
const auto& clock = env->GetSystemClock();
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));
env->StartThread(ThreadBody, threads[i].get());
}
{
MutexLock l(shared.GetMutex());
while (!shared.AllInitialized()) {
shared.GetCondVar()->Wait();
}
// Record start time
uint64_t start_time = clock->NowMicros();
// Start all threads
shared.SetStart();
shared.GetCondVar()->SignalAll();
// Wait threads to complete
while (!shared.AllDone()) {
shared.GetCondVar()->Wait();
}
// Record end time
uint64_t end_time = clock->NowMicros();
double elapsed = static_cast<double>(end_time - start_time) * 1e-6;
uint32_t qps = static_cast<uint32_t>(
static_cast<double>(FLAGS_threads * FLAGS_ops_per_thread) / elapsed);
fprintf(stdout, "Complete in %.3f s; QPS = %u\n", elapsed, qps);
}
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_;
static void ThreadBody(void* v) {
ThreadState* thread = static_cast<ThreadState*>(v);
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;
for (uint64_t i = 0; i < FLAGS_ops_per_thread; i++) {
Slice key = gen.GetRand(thread->rnd, max_key_);
uint64_t random_op = thread->rnd.Next();
if (random_op < lookup_insert_threshold_) {
if (handle) {
cache_->Release(handle);
handle = nullptr;
}
// do lookup
handle = cache_->Lookup(key);
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), FLAGS_value_bytes,
&deleter, &handle);
}
} else if (random_op < insert_threshold_) {
if (handle) {
cache_->Release(handle);
handle = nullptr;
}
// do insert
cache_->Insert(key, createValue(thread->rnd), FLAGS_value_bytes,
&deleter, &handle);
} else if (random_op < lookup_threshold_) {
if (handle) {
cache_->Release(handle);
handle = nullptr;
}
// do lookup
handle = cache_->Lookup(key);
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);
}
}
if (handle) {
cache_->Release(handle);
handle = nullptr;
}
}
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 : %" PRIu64 "\n", FLAGS_cache_size);
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);
printf("----------------------------\n");
}
};
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) { int main(int argc, char** argv) {
ParseCommandLineFlags(&argc, &argv, true); return ROCKSDB_NAMESPACE::cache_bench_tool(argc, argv);
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;
}
} }
#endif // GFLAGS #endif // GFLAGS

506
cache/cache_bench_tool.cc vendored Normal file
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@ -0,0 +1,506 @@
// 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).
#ifndef GFLAGS
#include <cstdio>
int main() {
fprintf(stderr, "Please install gflags to run rocksdb tools\n");
return 1;
}
#else
#include <sys/types.h>
#include <cinttypes>
#include <cstdio>
#include <limits>
#include "options/configurable_helper.h"
#include "port/port.h"
#include "rocksdb/cache.h"
#include "rocksdb/cache_bench_tool.h"
#include "rocksdb/db.h"
#include "rocksdb/env.h"
#include "rocksdb/system_clock.h"
#include "rocksdb/tiered_cache.h"
#include "rocksdb/utilities/object_registry.h"
#include "rocksdb/utilities/options_type.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"
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, 0,
"Number of operations per thread. (Default: 5 * keyspace size)");
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(use_clock_cache, false, "");
DEFINE_bool(skewed, false, "If true, skew the key access distribution");
DEFINE_string(tiered_cache_uri, "",
"Full URI for creating a custom NVM cache object");
static class std::shared_ptr<ROCKSDB_NAMESPACE::TieredCache> tiered_cache;
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_;
};
class Stats {
private:
uint64_t hits;
uint64_t misses;
uint64_t lookup_us;
uint64_t insert_us;
public:
Stats() : hits(0), misses(0), lookup_us(0), insert_us(0) {}
void AddHits(uint64_t inc) { hits += inc; }
void AddMisses(uint64_t inc) { misses += inc; }
void AddLookupUs(uint64_t lookup) { lookup_us += lookup; }
void AddInsertUs(uint64_t insert) { insert_us += insert; }
void Merge(const Stats& other) {
hits += other.hits;
misses += other.misses;
lookup_us += other.lookup_us;
insert_us += other.insert_us;
}
void Report() {
fprintf(stdout, "%lu hits, %lu misses, %lu lookup_ns, %lu insert_ns\n",
hits, misses, lookup_us, insert_us);
fflush(stdout);
}
};
// Per-thread state for concurrent executions of the same benchmark.
struct ThreadState {
uint32_t tid;
Random64 rnd;
Stats stats;
SharedState* shared;
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;
}
void helperCallback(Cache::SizeCallback* size_cb,
Cache::SaveToCallback* save_cb,
Cache::DeletionCallback* del_cb) {
if (size_cb) {
*size_cb = [](void* /*obj*/) -> size_t { return FLAGS_value_bytes; };
}
if (save_cb) {
*save_cb = [](void* obj, size_t /*offset*/, size_t size,
void* out) -> Status {
memcpy(out, obj, size);
return Status::OK();
};
}
if (del_cb) {
*del_cb = [](const Slice& /*key*/, void* obj) -> void {
delete[] static_cast<char*>(obj);
};
}
}
} // 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);
}
if (skewed_) {
uint64_t max_key = max_key_;
max_log_ = 0;
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);
if (!FLAGS_tiered_cache_uri.empty()) {
Status s = ObjectRegistry::NewInstance()->NewSharedObject<TieredCache>(
FLAGS_tiered_cache_uri, &tiered_cache);
if (tiered_cache == nullptr) {
fprintf(stderr,
"No tiered cache registered matching string: %s status=%s\n",
FLAGS_tiered_cache_uri.c_str(), s.ToString().c_str());
exit(1);
}
opts.tiered_cache = tiered_cache;
}
cache_ = NewLRUCache(opts);
}
if (FLAGS_ops_per_thread == 0) {
FLAGS_ops_per_thread = 5 * max_key_;
}
}
~CacheBench() {}
void PopulateCache() {
Random64 rnd(1);
KeyGen keygen;
for (uint64_t i = 0; i < 10 * FLAGS_cache_size; i += FLAGS_value_bytes) {
cache_->Insert(keygen.GetRand(rnd, max_key_, max_log_), createValue(rnd),
helperCallback, FLAGS_value_bytes);
}
}
bool Run() {
ROCKSDB_NAMESPACE::Env* env = ROCKSDB_NAMESPACE::Env::Default();
const auto& clock = env->GetSystemClock();
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));
env->StartThread(ThreadBody, threads[i].get());
}
{
MutexLock l(shared.GetMutex());
while (!shared.AllInitialized()) {
shared.GetCondVar()->Wait();
}
// Record start time
uint64_t start_time = clock->NowMicros();
// Start all threads
shared.SetStart();
shared.GetCondVar()->SignalAll();
// Wait threads to complete
while (!shared.AllDone()) {
shared.GetCondVar()->Wait();
}
// Record end time
uint64_t end_time = clock->NowMicros();
double elapsed = static_cast<double>(end_time - start_time) * 1e-6;
uint32_t qps = static_cast<uint32_t>(
static_cast<double>(FLAGS_threads * FLAGS_ops_per_thread) / elapsed);
fprintf(stdout, "Complete in %.3f s; QPS = %u\n", elapsed, qps);
Stats merge_stats;
for (uint32_t i = 0; i < FLAGS_threads; ++i) {
merge_stats.Merge(threads[i]->stats);
}
merge_stats.Report();
}
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_;
static void ThreadBody(void* v) {
ThreadState* thread = static_cast<ThreadState*>(v);
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;
ROCKSDB_NAMESPACE::Env* env = ROCKSDB_NAMESPACE::Env::Default();
SystemClock* clock = env->GetSystemClock().get();
for (uint64_t i = 0; i < FLAGS_ops_per_thread; i++) {
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
{
uint64_t elapsed = 0;
{
StopWatch sw(clock, nullptr, 0, &elapsed);
handle = cache_->Lookup(key, helperCallback, create_cb,
Cache::Priority::LOW, true);
}
thread->stats.AddLookupUs(elapsed);
}
if (handle) {
thread->stats.AddHits(1);
// do something with the data
result += NPHash64(static_cast<char*>(cache_->Value(handle)),
FLAGS_value_bytes);
} else {
thread->stats.AddMisses(1);
// do insert
{
uint64_t elapsed = 0;
{
StopWatch sw(clock, nullptr, 0, &elapsed);
cache_->Insert(key, createValue(thread->rnd), helperCallback,
FLAGS_value_bytes, &handle);
}
thread->stats.AddInsertUs(elapsed);
}
}
} else if (random_op < insert_threshold_) {
if (handle) {
cache_->Release(handle);
handle = nullptr;
}
// do insert
{
uint64_t elapsed = 0;
{
StopWatch sw(clock, nullptr, 0, &elapsed);
cache_->Insert(key, createValue(thread->rnd), helperCallback,
FLAGS_value_bytes, &handle);
}
thread->stats.AddInsertUs(elapsed);
}
} else if (random_op < lookup_threshold_) {
if (handle) {
cache_->Release(handle);
handle = nullptr;
}
// do lookup
{
uint64_t elapsed = 0;
{
StopWatch sw(clock, nullptr, 0, &elapsed);
handle = cache_->Lookup(key, helperCallback, create_cb,
Cache::Priority::LOW, true);
}
thread->stats.AddLookupUs(elapsed);
}
if (handle) {
thread->stats.AddHits(1);
// 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);
}
}
if (handle) {
cache_->Release(handle);
handle = nullptr;
}
}
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 : %" PRIu64 "\n", FLAGS_cache_size);
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);
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
#endif // GFLAGS

1
cache/lru_cache.cc vendored
View File

@ -377,7 +377,6 @@ Cache::Handle* LRUCacheShard::Lookup(
e->SetPromoted(true); e->SetPromoted(true);
e->SetTieredCacheCompatible(true); e->SetTieredCacheCompatible(true);
e->info_.helper_cb = helper_cb; e->info_.helper_cb = helper_cb;
e->charge = tiered_handle->Size();
e->key_length = key.size(); e->key_length = key.size();
e->hash = hash; e->hash = hash;
e->refs = 0; e->refs = 0;

144
include/rocksdb/cache.h
View File

@ -248,38 +248,6 @@ class Cache {
Handle** handle = nullptr, Handle** handle = nullptr,
Priority priority = Priority::LOW) = 0; Priority priority = Priority::LOW) = 0;
// Insert a mapping from key->value into the volatile cache and assign it
// the specified charge against the total cache capacity.
// If strict_capacity_limit is true and cache reaches its full capacity,
// return Status::Incomplete.
//
// If handle is not nullptr, returns a handle that corresponds to the
// mapping. The caller must call this->Release(handle) when the returned
// mapping is no longer needed. In case of error caller is responsible to
// cleanup the value (i.e. calling "deleter").
//
// If handle is nullptr, it is as if Release is called immediately after
// insert. In case of error value will be cleanup.
//
// Regardless of whether the item was inserted into the volatile cache,
// it will attempt to insert it into the NVM cache if one is configured.
// The block cache implementation must support the NVM tier, otherwise
// the item is only inserted into the volatile tier. It may
// defer the insertion to NVM as it sees fit. The NVM
// cache may or may not write it to NVM depending on its admission
// policy.
//
// When the inserted entry is no longer needed, the key and
// value will be passed to "deleter".
virtual Status Insert(const Slice& key, void* value,
CacheItemHelperCallback helper_cb, size_t charge,
Handle** handle = nullptr,
Priority priority = Priority::LOW) {
DeletionCallback delete_cb = nullptr;
(*helper_cb)(nullptr, nullptr, &delete_cb);
return Insert(key, value, charge, delete_cb, handle, priority);
}
// If the cache has no mapping for "key", returns nullptr. // If the cache has no mapping for "key", returns nullptr.
// //
// Else return a handle that corresponds to the mapping. The caller // Else return a handle that corresponds to the mapping. The caller
@ -289,25 +257,6 @@ class Cache {
// function. // function.
virtual Handle* Lookup(const Slice& key, Statistics* stats = nullptr) = 0; virtual Handle* Lookup(const Slice& key, Statistics* stats = nullptr) = 0;
// Lookup the key in the volatile and NVM tiers (if one is configured).
// The create_cb callback function object will be used to contruct the
// cached object.
// If none of the tiers have the mapping for the key, rturns nullptr.
// Else, returns a handle that corresponds to the mapping.
//
// The handle returned may not be ready. The caller should call isReady()
// to check if the item value is ready, and call Wait() or WaitAll() if
// its not ready. The caller should then call Value() to check if the
// item was successfully retrieved. If unsuccessful (perhaps due to an
// IO error), Value() will return nullptr.
virtual Handle* Lookup(const Slice& key,
CacheItemHelperCallback /*helper_cb*/,
const CreateCallback& /*create_cb*/,
Priority /*priority*/, bool /*wait*/,
Statistics* stats = nullptr) {
return Lookup(key, stats);
}
// Increments the reference count for the handle if it refers to an entry in // Increments the reference count for the handle if it refers to an entry in
// the cache. Returns true if refcount was incremented; otherwise, returns // the cache. Returns true if refcount was incremented; otherwise, returns
// false. // false.
@ -328,27 +277,6 @@ class Cache {
// REQUIRES: handle must have been returned by a method on *this. // REQUIRES: handle must have been returned by a method on *this.
virtual bool Release(Handle* handle, bool force_erase = false) = 0; virtual bool Release(Handle* handle, bool force_erase = false) = 0;
// Release a mapping returned by a previous Lookup(). The "useful"
// parameter specifies whether the data was actually used or not,
// which may be used by the cache implementation to decide whether
// to consider it as a hit for retention purposes.
virtual bool Release(Handle* handle, bool /*useful*/, bool force_erase) {
return Release(handle, force_erase);
}
// Determines if the handle returned by Lookup() has a valid value yet.
virtual bool isReady(Handle* /*handle*/) { return true; }
// If the handle returned by Lookup() is not ready yet, wait till it
// becomes ready.
// Note: A ready handle doesn't necessarily mean it has a valid value. The
// user should call Value() and check for nullptr.
virtual void Wait(Handle* /*handle*/) {}
// Wait for a vector of handles to become ready. As with Wait(), the user
// should check the Value() of each handle for nullptr
virtual void WaitAll(std::vector<Handle*>& /*handles*/) {}
// Return the value encapsulated in a handle returned by a // Return the value encapsulated in a handle returned by a
// successful Lookup(). // successful Lookup().
// REQUIRES: handle must not have been released yet. // REQUIRES: handle must not have been released yet.
@ -417,6 +345,78 @@ class Cache {
MemoryAllocator* memory_allocator() const { return memory_allocator_.get(); } MemoryAllocator* memory_allocator() const { return memory_allocator_.get(); }
// Insert a mapping from key->value into the volatile cache and assign it
// the specified charge against the total cache capacity.
// If strict_capacity_limit is true and cache reaches its full capacity,
// return Status::Incomplete.
//
// If handle is not nullptr, returns a handle that corresponds to the
// mapping. The caller must call this->Release(handle) when the returned
// mapping is no longer needed. In case of error caller is responsible to
// cleanup the value (i.e. calling "deleter").
//
// If handle is nullptr, it is as if Release is called immediately after
// insert. In case of error value will be cleanup.
//
// Regardless of whether the item was inserted into the volatile cache,
// it will attempt to insert it into the NVM cache if one is configured.
// The block cache implementation must support the NVM tier, otherwise
// the item is only inserted into the volatile tier. It may
// defer the insertion to NVM as it sees fit. The NVM
// cache may or may not write it to NVM depending on its admission
// policy.
//
// When the inserted entry is no longer needed, the key and
// value will be passed to "deleter".
virtual Status Insert(const Slice& key, void* value,
CacheItemHelperCallback helper_cb, size_t charge,
Handle** handle = nullptr,
Priority priority = Priority::LOW) {
DeletionCallback delete_cb = nullptr;
(*helper_cb)(nullptr, nullptr, &delete_cb);
return Insert(key, value, charge, delete_cb, handle, priority);
}
// Lookup the key in the volatile and NVM tiers (if one is configured).
// The create_cb callback function object will be used to contruct the
// cached object.
// If none of the tiers have the mapping for the key, rturns nullptr.
// Else, returns a handle that corresponds to the mapping.
//
// The handle returned may not be ready. The caller should call isReady()
// to check if the item value is ready, and call Wait() or WaitAll() if
// its not ready. The caller should then call Value() to check if the
// item was successfully retrieved. If unsuccessful (perhaps due to an
// IO error), Value() will return nullptr.
virtual Handle* Lookup(const Slice& key,
CacheItemHelperCallback /*helper_cb*/,
const CreateCallback& /*create_cb*/,
Priority /*priority*/, bool /*wait*/,
Statistics* stats = nullptr) {
return Lookup(key, stats);
}
// Release a mapping returned by a previous Lookup(). The "useful"
// parameter specifies whether the data was actually used or not,
// which may be used by the cache implementation to decide whether
// to consider it as a hit for retention purposes.
virtual bool Release(Handle* handle, bool /*useful*/, bool force_erase) {
return Release(handle, force_erase);
}
// Determines if the handle returned by Lookup() has a valid value yet.
virtual bool isReady(Handle* /*handle*/) { return true; }
// If the handle returned by Lookup() is not ready yet, wait till it
// becomes ready.
// Note: A ready handle doesn't necessarily mean it has a valid value. The
// user should call Value() and check for nullptr.
virtual void Wait(Handle* /*handle*/) {}
// Wait for a vector of handles to become ready. As with Wait(), the user
// should check the Value() of each handle for nullptr
virtual void WaitAll(std::vector<Handle*>& /*handles*/) {}
private: private:
std::shared_ptr<MemoryAllocator> memory_allocator_; std::shared_ptr<MemoryAllocator> memory_allocator_;
}; };

14
include/rocksdb/cache_bench_tool.h Normal file
View File

@ -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

4
include/rocksdb/configurable.h
View File

@ -356,4 +356,8 @@ class Configurable {
// Configurable option via // Configurable option via
std::vector<RegisteredOptions> options_; std::vector<RegisteredOptions> options_;
}; };
extern void RegisterConfigurableOptions(
Configurable& configurable, const std::string& name, void* opt_ptr,
const std::unordered_map<std::string, OptionTypeInfo>* opt_map);
} // namespace ROCKSDB_NAMESPACE } // namespace ROCKSDB_NAMESPACE

2
include/rocksdb/tiered_cache.h
View File

@ -48,6 +48,8 @@ class TieredCache {
virtual std::string Name() = 0; virtual std::string Name() = 0;
static const char* Type() { return "TieredCache"; }
// Insert the given value into this tier. The value is not written // Insert the given value into this tier. The value is not written
// directly. Rather, the SaveToCallback provided by helper_cb will be // directly. Rather, the SaveToCallback provided by helper_cb will be
// used to extract the persistable data in value, which will be written // used to extract the persistable data in value, which will be written

6
options/configurable.cc
View File

@ -31,6 +31,12 @@ void ConfigurableHelper::RegisterOptions(
configurable.options_.emplace_back(opts); configurable.options_.emplace_back(opts);
} }
void RegisterConfigurableOptions(
Configurable& configurable, const std::string& name, void* opt_ptr,
const std::unordered_map<std::string, OptionTypeInfo>* type_map) {
ConfigurableHelper::RegisterOptions(configurable, name, opt_ptr, type_map);
}
//************************************************************************* //*************************************************************************
// //
// Methods for Initializing and Validating Configurable Objects // Methods for Initializing and Validating Configurable Objects

3
src.mk
View File

@ -320,6 +320,9 @@ MOCK_LIB_SOURCES = \
BENCH_LIB_SOURCES = \ BENCH_LIB_SOURCES = \
tools/db_bench_tool.cc \ tools/db_bench_tool.cc \
CACHE_BENCH_LIB_SOURCES = \
cache/cache_bench_tool.cc \
STRESS_LIB_SOURCES = \ STRESS_LIB_SOURCES = \
db_stress_tool/batched_ops_stress.cc \ db_stress_tool/batched_ops_stress.cc \
db_stress_tool/cf_consistency_stress.cc \ db_stress_tool/cf_consistency_stress.cc \

39
tools/db_bench_tool.cc
View File

@ -53,8 +53,10 @@
#include "rocksdb/slice.h" #include "rocksdb/slice.h"
#include "rocksdb/slice_transform.h" #include "rocksdb/slice_transform.h"
#include "rocksdb/stats_history.h" #include "rocksdb/stats_history.h"
#include "rocksdb/tiered_cache.h"
#include "rocksdb/utilities/object_registry.h" #include "rocksdb/utilities/object_registry.h"
#include "rocksdb/utilities/optimistic_transaction_db.h" #include "rocksdb/utilities/optimistic_transaction_db.h"
#include "rocksdb/utilities/options_type.h"
#include "rocksdb/utilities/options_util.h" #include "rocksdb/utilities/options_util.h"
#include "rocksdb/utilities/sim_cache.h" #include "rocksdb/utilities/sim_cache.h"
#include "rocksdb/utilities/transaction.h" #include "rocksdb/utilities/transaction.h"
@ -1409,6 +1411,10 @@ DEFINE_bool(read_with_latest_user_timestamp, true,
"If true, always use the current latest timestamp for read. If " "If true, always use the current latest timestamp for read. If "
"false, choose a random timestamp from the past."); "false, choose a random timestamp from the past.");
DEFINE_string(tiered_cache_uri, "",
"Full URI for creating a custom tiered cache object");
static class std::shared_ptr<ROCKSDB_NAMESPACE::TieredCache> tiered_cache;
static const bool FLAGS_soft_rate_limit_dummy __attribute__((__unused__)) = static const bool FLAGS_soft_rate_limit_dummy __attribute__((__unused__)) =
RegisterFlagValidator(&FLAGS_soft_rate_limit, &ValidateRateLimit); RegisterFlagValidator(&FLAGS_soft_rate_limit, &ValidateRateLimit);
@ -2757,22 +2763,35 @@ class Benchmark {
} }
return cache; return cache;
} else { } else {
if (FLAGS_use_cache_memkind_kmem_allocator) { LRUCacheOptions opts(
static_cast<size_t>(capacity), FLAGS_cache_numshardbits,
false /*strict_capacity_limit*/, FLAGS_cache_high_pri_pool_ratio,
#ifdef MEMKIND #ifdef MEMKIND
return NewLRUCache( FLAGS_use_cache_memkind_kmem_allocator
static_cast<size_t>(capacity), FLAGS_cache_numshardbits, ? std::make_shared<MemkindKmemAllocator>()
false /*strict_capacity_limit*/, FLAGS_cache_high_pri_pool_ratio, : nullptr
std::make_shared<MemkindKmemAllocator>());
#else #else
nullptr
#endif
);
if (FLAGS_use_cache_memkind_kmem_allocator) {
#ifndef MEMKIND
fprintf(stderr, "Memkind library is not linked with the binary."); fprintf(stderr, "Memkind library is not linked with the binary.");
exit(1); exit(1);
#endif #endif
} else {
return NewLRUCache(
static_cast<size_t>(capacity), FLAGS_cache_numshardbits,
false /*strict_capacity_limit*/, FLAGS_cache_high_pri_pool_ratio);
} }
if (!FLAGS_tiered_cache_uri.empty()) {
Status s = ObjectRegistry::NewInstance()->NewSharedObject<TieredCache>(
FLAGS_tiered_cache_uri, &tiered_cache);
if (tiered_cache == nullptr) {
fprintf(stderr,
"No tiered cache registered matching string: %s status=%s\n",
FLAGS_tiered_cache_uri.c_str(), s.ToString().c_str());
exit(1);
}
opts.tiered_cache = tiered_cache;
}
return NewLRUCache(opts);
} }
} }