rocksdb/db_stress_tool/db_stress_shared_state.h

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// 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).
//
// 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
#ifdef GFLAGS
#pragma once
#include "db_stress_tool/db_stress_stat.h"
#include "util/gflags_compat.h"
DECLARE_uint64(seed);
DECLARE_int64(max_key);
DECLARE_uint64(log2_keys_per_lock);
DECLARE_int32(threads);
DECLARE_int32(column_families);
DECLARE_int32(nooverwritepercent);
DECLARE_string(expected_values_path);
DECLARE_int32(clear_column_family_one_in);
DECLARE_bool(test_batches_snapshots);
DECLARE_int32(compaction_thread_pool_adjust_interval);
DECLARE_int32(continuous_verification_interval);
namespace rocksdb {
class StressTest;
// State shared by all concurrent executions of the same benchmark.
class SharedState {
public:
// indicates a key may have any value (or not be present) as an operation on
// it is incomplete.
static const uint32_t UNKNOWN_SENTINEL;
// indicates a key should definitely be deleted
static const uint32_t DELETION_SENTINEL;
SharedState(Env* env, StressTest* stress_test)
: cv_(&mu_),
seed_(static_cast<uint32_t>(FLAGS_seed)),
max_key_(FLAGS_max_key),
log2_keys_per_lock_(static_cast<uint32_t>(FLAGS_log2_keys_per_lock)),
num_threads_(FLAGS_threads),
num_initialized_(0),
num_populated_(0),
vote_reopen_(0),
num_done_(0),
start_(false),
start_verify_(false),
num_bg_threads_(0),
should_stop_bg_thread_(false),
bg_thread_finished_(0),
stress_test_(stress_test),
verification_failure_(false),
should_stop_test_(false),
no_overwrite_ids_(FLAGS_column_families),
values_(nullptr),
printing_verification_results_(false) {
// Pick random keys in each column family that will not experience
// overwrite
fprintf(stdout, "Choosing random keys with no overwrite\n");
Random64 rnd(seed_);
// Start with the identity permutation. Subsequent iterations of
// for loop below will start with perm of previous for loop
int64_t* permutation = new int64_t[max_key_];
for (int64_t i = 0; i < max_key_; i++) {
permutation[i] = i;
}
// Now do the Knuth shuffle
int64_t num_no_overwrite_keys = (max_key_ * FLAGS_nooverwritepercent) / 100;
// Only need to figure out first num_no_overwrite_keys of permutation
no_overwrite_ids_.reserve(num_no_overwrite_keys);
for (int64_t i = 0; i < num_no_overwrite_keys; i++) {
int64_t rand_index = i + rnd.Next() % (max_key_ - i);
// Swap i and rand_index;
int64_t temp = permutation[i];
permutation[i] = permutation[rand_index];
permutation[rand_index] = temp;
// Fill no_overwrite_ids_ with the first num_no_overwrite_keys of
// permutation
no_overwrite_ids_.insert(permutation[i]);
}
delete[] permutation;
size_t expected_values_size =
sizeof(std::atomic<uint32_t>) * FLAGS_column_families * max_key_;
bool values_init_needed = false;
Status status;
if (!FLAGS_expected_values_path.empty()) {
if (!std::atomic<uint32_t>{}.is_lock_free()) {
status = Status::InvalidArgument(
"Cannot use --expected_values_path on platforms without lock-free "
"std::atomic<uint32_t>");
}
if (status.ok() && FLAGS_clear_column_family_one_in > 0) {
status = Status::InvalidArgument(
"Cannot use --expected_values_path on when "
"--clear_column_family_one_in is greater than zero.");
}
uint64_t size = 0;
if (status.ok()) {
status = env->GetFileSize(FLAGS_expected_values_path, &size);
}
std::unique_ptr<WritableFile> wfile;
if (status.ok() && size == 0) {
const EnvOptions soptions;
status =
env->NewWritableFile(FLAGS_expected_values_path, &wfile, soptions);
}
if (status.ok() && size == 0) {
std::string buf(expected_values_size, '\0');
status = wfile->Append(buf);
values_init_needed = true;
}
if (status.ok()) {
status = env->NewMemoryMappedFileBuffer(FLAGS_expected_values_path,
&expected_mmap_buffer_);
}
if (status.ok()) {
assert(expected_mmap_buffer_->GetLen() == expected_values_size);
values_ = static_cast<std::atomic<uint32_t>*>(
expected_mmap_buffer_->GetBase());
assert(values_ != nullptr);
} else {
fprintf(stderr, "Failed opening shared file '%s' with error: %s\n",
FLAGS_expected_values_path.c_str(), status.ToString().c_str());
assert(values_ == nullptr);
}
}
if (values_ == nullptr) {
values_allocation_.reset(
new std::atomic<uint32_t>[FLAGS_column_families * max_key_]);
values_ = &values_allocation_[0];
values_init_needed = true;
}
assert(values_ != nullptr);
if (values_init_needed) {
for (int i = 0; i < FLAGS_column_families; ++i) {
for (int j = 0; j < max_key_; ++j) {
Delete(i, j, false /* pending */);
}
}
}
if (FLAGS_test_batches_snapshots) {
fprintf(stdout, "No lock creation because test_batches_snapshots set\n");
return;
}
long num_locks = static_cast<long>(max_key_ >> log2_keys_per_lock_);
if (max_key_ & ((1 << log2_keys_per_lock_) - 1)) {
num_locks++;
}
fprintf(stdout, "Creating %ld locks\n", num_locks * FLAGS_column_families);
key_locks_.resize(FLAGS_column_families);
for (int i = 0; i < FLAGS_column_families; ++i) {
key_locks_[i].resize(num_locks);
for (auto& ptr : key_locks_[i]) {
ptr.reset(new port::Mutex);
}
}
if (FLAGS_compaction_thread_pool_adjust_interval > 0) {
++num_bg_threads_;
fprintf(stdout, "Starting compaction_thread_pool_adjust_thread\n");
}
if (FLAGS_continuous_verification_interval > 0) {
++num_bg_threads_;
fprintf(stdout, "Starting continuous_verification_thread\n");
}
}
~SharedState() {}
port::Mutex* GetMutex() { return &mu_; }
port::CondVar* GetCondVar() { return &cv_; }
StressTest* GetStressTest() const { return stress_test_; }
int64_t GetMaxKey() const { return max_key_; }
uint32_t GetNumThreads() const { return num_threads_; }
void IncInitialized() { num_initialized_++; }
void IncOperated() { num_populated_++; }
void IncDone() { num_done_++; }
void IncVotedReopen() { vote_reopen_ = (vote_reopen_ + 1) % num_threads_; }
bool AllInitialized() const { return num_initialized_ >= num_threads_; }
bool AllOperated() const { return num_populated_ >= num_threads_; }
bool AllDone() const { return num_done_ >= num_threads_; }
bool AllVotedReopen() { return (vote_reopen_ == 0); }
void SetStart() { start_ = true; }
void SetStartVerify() { start_verify_ = true; }
bool Started() const { return start_; }
bool VerifyStarted() const { return start_verify_; }
void SetVerificationFailure() { verification_failure_.store(true); }
bool HasVerificationFailedYet() const { return verification_failure_.load(); }
void SetShouldStopTest() { should_stop_test_.store(true); }
bool ShouldStopTest() const { return should_stop_test_.load(); }
port::Mutex* GetMutexForKey(int cf, int64_t key) {
return key_locks_[cf][key >> log2_keys_per_lock_].get();
}
void LockColumnFamily(int cf) {
for (auto& mutex : key_locks_[cf]) {
mutex->Lock();
}
}
void UnlockColumnFamily(int cf) {
for (auto& mutex : key_locks_[cf]) {
mutex->Unlock();
}
}
std::atomic<uint32_t>& Value(int cf, int64_t key) const {
return values_[cf * max_key_ + key];
}
void ClearColumnFamily(int cf) {
std::fill(&Value(cf, 0 /* key */), &Value(cf + 1, 0 /* key */),
DELETION_SENTINEL);
}
// @param pending True if the update may have started but is not yet
// guaranteed finished. This is useful for crash-recovery testing when the
// process may crash before updating the expected values array.
void Put(int cf, int64_t key, uint32_t value_base, bool pending) {
if (!pending) {
// prevent expected-value update from reordering before Write
std::atomic_thread_fence(std::memory_order_release);
}
Value(cf, key).store(pending ? UNKNOWN_SENTINEL : value_base,
std::memory_order_relaxed);
if (pending) {
// prevent Write from reordering before expected-value update
std::atomic_thread_fence(std::memory_order_release);
}
}
uint32_t Get(int cf, int64_t key) const { return Value(cf, key); }
// @param pending See comment above Put()
// Returns true if the key was not yet deleted.
bool Delete(int cf, int64_t key, bool pending) {
if (Value(cf, key) == DELETION_SENTINEL) {
return false;
}
Put(cf, key, DELETION_SENTINEL, pending);
return true;
}
// @param pending See comment above Put()
// Returns true if the key was not yet deleted.
bool SingleDelete(int cf, int64_t key, bool pending) {
return Delete(cf, key, pending);
}
// @param pending See comment above Put()
// Returns number of keys deleted by the call.
int DeleteRange(int cf, int64_t begin_key, int64_t end_key, bool pending) {
int covered = 0;
for (int64_t key = begin_key; key < end_key; ++key) {
if (Delete(cf, key, pending)) {
++covered;
}
}
return covered;
}
bool AllowsOverwrite(int64_t key) {
return no_overwrite_ids_.find(key) == no_overwrite_ids_.end();
}
bool Exists(int cf, int64_t key) {
// UNKNOWN_SENTINEL counts as exists. That assures a key for which overwrite
// is disallowed can't be accidentally added a second time, in which case
// SingleDelete wouldn't be able to properly delete the key. It does allow
// the case where a SingleDelete might be added which covers nothing, but
// that's not a correctness issue.
uint32_t expected_value = Value(cf, key).load();
return expected_value != DELETION_SENTINEL;
}
uint32_t GetSeed() const { return seed_; }
void SetShouldStopBgThread() { should_stop_bg_thread_ = true; }
bool ShouldStopBgThread() { return should_stop_bg_thread_; }
void IncBgThreadsFinished() { ++bg_thread_finished_; }
bool BgThreadsFinished() const {
return bg_thread_finished_ == num_bg_threads_;
}
bool ShouldVerifyAtBeginning() const {
return expected_mmap_buffer_.get() != nullptr;
}
bool PrintingVerificationResults() {
bool tmp = false;
return !printing_verification_results_.compare_exchange_strong(
tmp, true, std::memory_order_relaxed);
}
void FinishPrintingVerificationResults() {
printing_verification_results_.store(false, std::memory_order_relaxed);
}
private:
port::Mutex mu_;
port::CondVar cv_;
const uint32_t seed_;
const int64_t max_key_;
const uint32_t log2_keys_per_lock_;
const int num_threads_;
long num_initialized_;
long num_populated_;
long vote_reopen_;
long num_done_;
bool start_;
bool start_verify_;
int num_bg_threads_;
bool should_stop_bg_thread_;
int bg_thread_finished_;
StressTest* stress_test_;
std::atomic<bool> verification_failure_;
std::atomic<bool> should_stop_test_;
// Keys that should not be overwritten
std::unordered_set<size_t> no_overwrite_ids_;
std::atomic<uint32_t>* values_;
std::unique_ptr<std::atomic<uint32_t>[]> values_allocation_;
// Has to make it owned by a smart ptr as port::Mutex is not copyable
// and storing it in the container may require copying depending on the impl.
std::vector<std::vector<std::unique_ptr<port::Mutex>>> key_locks_;
std::unique_ptr<MemoryMappedFileBuffer> expected_mmap_buffer_;
std::atomic<bool> printing_verification_results_;
};
// Per-thread state for concurrent executions of the same benchmark.
struct ThreadState {
uint32_t tid; // 0..n-1
Random rand; // Has different seeds for different threads
SharedState* shared;
Stats stats;
struct SnapshotState {
const Snapshot* snapshot;
// The cf from which we did a Get at this snapshot
int cf_at;
// The name of the cf at the time that we did a read
std::string cf_at_name;
// The key with which we did a Get at this snapshot
std::string key;
// The status of the Get
Status status;
// The value of the Get
std::string value;
// optional state of all keys in the db
std::vector<bool>* key_vec;
};
std::queue<std::pair<uint64_t, SnapshotState>> snapshot_queue;
ThreadState(uint32_t index, SharedState* _shared)
: tid(index), rand(1000 + index + _shared->GetSeed()), shared(_shared) {}
};
} // namespace rocksdb
#endif // GFLAGS