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rocksdb/tools/db_stress.cc
Dhruba Borthakur 5dc784c233 Fix compilation problem with db_stress when using C11 compiler. 
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2012-10-12 17:00:25 -07:00

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// 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.
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include "db/db_impl.h"
#include "db/version_set.h"
#include "db/db_statistics.h"
#include "leveldb/cache.h"
#include "leveldb/db.h"
#include "leveldb/env.h"
#include "leveldb/write_batch.h"
#include "leveldb/statistics.h"
#include "port/port.h"
#include "util/crc32c.h"
#include "util/histogram.h"
#include "util/mutexlock.h"
#include "util/random.h"
#include "util/testutil.h"
#include "hdfs/env_hdfs.h"
static const long KB = 1024;
// Seed for PRNG
static uint32_t FLAGS_seed = 2341234;
// Max number of key/values to place in database
static long FLAGS_max_key = 2 * KB * KB * KB;
// Number of concurrent threads to run.
static int FLAGS_threads = 32;
// Size of each value will be this number times rand_int(1,3) bytes
static int FLAGS_value_size_mult = 8;
static bool FLAGS_verify_before_write = false;
// Print histogram of operation timings
static bool FLAGS_histogram = false;
static bool FLAGS_verbose = false;
// Number of bytes to buffer in memtable before compacting
// (initialized to default value by "main")
static int FLAGS_write_buffer_size = 0;
// Number of bytes to use as a cache of uncompressed data.
static long FLAGS_cache_size = 2 * KB * KB * KB;
// Number of bytes in a block.
static int FLAGS_block_size = 4 * KB;
// Maximum number of files to keep open at the same time (use default if == 0)
static int FLAGS_open_files = 0;
// Bloom filter bits per key.
// Negative means use default settings.
static int FLAGS_bloom_bits = 10;
// Use the db with the following name.
static const char* FLAGS_db = NULL;
// Verify checksum for every block read from storage
static bool FLAGS_verify_checksum = false;
// Database statistics
static class leveldb::DBStatistics* dbstats;
// Sync all writes to disk
static bool FLAGS_sync = false;
// If true, do not wait until data is synced to disk.
static bool FLAGS_disable_data_sync = false;
// If true, issue fsync instead of fdatasync
static bool FLAGS_use_fsync = false;
// If true, do not write WAL for write.
static bool FLAGS_disable_wal = false;
// Target level-0 file size for compaction
static int FLAGS_target_file_size_base = 64 * KB;
// A multiplier to compute targe level-N file size
static int FLAGS_target_file_size_multiplier = 1;
// Max bytes for level-0
static int FLAGS_max_bytes_for_level_base = 256 * KB;
// A multiplier to compute max bytes for level-N
static int FLAGS_max_bytes_for_level_multiplier = 2;
// Number of files in level-0 that will trigger put stop.
static int FLAGS_level0_stop_writes_trigger = 12;
// Number of files in level-0 that will slow down writes.
static int FLAGS_level0_slowdown_writes_trigger = 8;
// Ratio of reads to writes (expressed as a percentage)
static int FLAGS_readwritepercent = 10;
// Option to disable compation triggered by read.
static int FLAGS_disable_seek_compaction = false;
// Algorithm to use to compress the database
static enum leveldb::CompressionType FLAGS_compression_type =
leveldb::kSnappyCompression;
// posix or hdfs environment
static leveldb::Env* FLAGS_env = leveldb::Env::Default();
// Number of operations per thread.
static uint32_t FLAGS_ops_per_thread = 600000;
// Log2 of number of keys per lock
static uint32_t FLAGS_log2_keys_per_lock = 2; // implies 2^2 keys per lock
extern bool useOsBuffer;
extern bool useFsReadAhead;
extern bool useMmapRead;
namespace leveldb {
class StressTest;
namespace {
class Stats {
private:
double start_;
double finish_;
double seconds_;
long done_;
long writes_;
int next_report_;
size_t bytes_;
double last_op_finish_;
Histogram hist_;
public:
Stats() { }
void Start() {
next_report_ = 100;
hist_.Clear();
done_ = 0;
writes_ = 0;
bytes_ = 0;
seconds_ = 0;
start_ = FLAGS_env->NowMicros();
last_op_finish_ = start_;
finish_ = start_;
}
void Merge(const Stats& other) {
hist_.Merge(other.hist_);
done_ += other.done_;
writes_ += other.writes_;
bytes_ += other.bytes_;
seconds_ += other.seconds_;
if (other.start_ < start_) start_ = other.start_;
if (other.finish_ > finish_) finish_ = other.finish_;
}
void Stop() {
finish_ = FLAGS_env->NowMicros();
seconds_ = (finish_ - start_) * 1e-6;
}
void FinishedSingleOp() {
if (FLAGS_histogram) {
double now = FLAGS_env->NowMicros();
double micros = now - last_op_finish_;
hist_.Add(micros);
if (micros > 20000) {
fprintf(stderr, "long op: %.1f micros%30s\r", micros, "");
fflush(stderr);
}
last_op_finish_ = now;
}
done_++;
if (done_ >= next_report_) {
if (next_report_ < 1000) next_report_ += 100;
else if (next_report_ < 5000) next_report_ += 500;
else if (next_report_ < 10000) next_report_ += 1000;
else if (next_report_ < 50000) next_report_ += 5000;
else if (next_report_ < 100000) next_report_ += 10000;
else if (next_report_ < 500000) next_report_ += 50000;
else next_report_ += 100000;
fprintf(stderr, "... finished %ld ops%30s\r", done_, "");
fflush(stderr);
}
}
void AddBytesForOneWrite(size_t n) {
writes_ ++;
bytes_ += n;
}
void Report(const char* name) {
std::string extra;
if (bytes_ < 1 || done_ < 1) {
fprintf(stderr, "No writes or ops?\n");
return;
}
double elapsed = (finish_ - start_) * 1e-6;
double bytes_mb = bytes_ / 1048576.0;
double rate = bytes_mb / elapsed;
double throughput = (double)done_/elapsed;
long percent_writes = (writes_ * 100) / done_;
fprintf(stdout, "%-12s: ", name);
fprintf(stdout, "%.3f micros/op %ld ops/sec\n",
seconds_ * 1e6 / done_, (long)throughput);
fprintf(stdout, "%-12s: Wrote %.2f MB (%.2f MB/sec) (%ld%% of %ld ops)\n",
"", bytes_mb, rate, (100*writes_)/done_, done_);
if (FLAGS_histogram) {
fprintf(stdout, "Microseconds per op:\n%s\n", hist_.ToString().c_str());
}
fflush(stdout);
}
};
// State shared by all concurrent executions of the same benchmark.
class SharedState {
public:
static const uint32_t SENTINEL = 0xffffffff;
SharedState(StressTest* stress_test) :
cv_(&mu_),
seed_(FLAGS_seed),
max_key_(FLAGS_max_key),
log2_keys_per_lock_(FLAGS_log2_keys_per_lock),
num_threads_(FLAGS_threads),
num_initialized_(0),
num_populated_(0),
num_done_(0),
start_(false),
start_verify_(false),
stress_test_(stress_test) {
values_ = new uint32_t[max_key_];
for (long i = 0; i < max_key_; i++) {
values_[i] = SENTINEL;
}
long num_locks = (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);
key_locks_ = new port::Mutex[num_locks];
}
~SharedState() {
delete[] values_;
delete[] key_locks_;
}
port::Mutex* GetMutex() {
return &mu_;
}
port::CondVar* GetCondVar() {
return &cv_;
}
StressTest* GetStressTest() const {
return stress_test_;
}
long GetMaxKey() const {
return max_key_;
}
uint32_t GetNumThreads() const {
return num_threads_;
}
void IncInitialized() {
num_initialized_++;
}
void IncPopulated() {
num_populated_++;
}
void IncDone() {
num_done_++;
}
bool AllInitialized() const {
return num_initialized_ >= num_threads_;
}
bool AllPopulated() const {
return num_populated_ >= num_threads_;
}
bool AllDone() const {
return num_done_ >= num_threads_;
}
void SetStart() {
start_ = true;
}
void SetStartVerify() {
start_verify_ = true;
}
bool Started() const {
return start_;
}
bool VerifyStarted() const {
return start_verify_;
}
port::Mutex* GetMutexForKey(long key) {
return &key_locks_[key >> log2_keys_per_lock_];
}
void Put(long key, uint32_t value_base) {
values_[key] = value_base;
}
uint32_t Get(long key) const {
return values_[key];
}
uint32_t GetSeed() const {
return seed_;
}
private:
port::Mutex mu_;
port::CondVar cv_;
const uint32_t seed_;
const long max_key_;
const uint32_t log2_keys_per_lock_;
const int num_threads_;
long num_initialized_;
long num_populated_;
long num_done_;
bool start_;
bool start_verify_;
StressTest* stress_test_;
uint32_t *values_;
port::Mutex *key_locks_;
};
// 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;
ThreadState(uint32_t index, SharedState *shared)
: tid(index),
rand(1000 + index + shared->GetSeed()),
shared(shared) {
}
};
} // namespace
class StressTest {
public:
StressTest()
: cache_(NewLRUCache(FLAGS_cache_size)),
filter_policy_(FLAGS_bloom_bits >= 0
? NewBloomFilterPolicy(FLAGS_bloom_bits)
: NULL),
db_(NULL) {
std::vector<std::string> files;
FLAGS_env->GetChildren(FLAGS_db, &files);
for (int i = 0; i < files.size(); i++) {
if (Slice(files[i]).starts_with("heap-")) {
FLAGS_env->DeleteFile(std::string(FLAGS_db) + "/" + files[i]);
}
}
DestroyDB(FLAGS_db, Options());
}
~StressTest() {
delete db_;
delete cache_;
delete filter_policy_;
}
void Run() {
PrintEnv();
Open();
SharedState shared(this);
uint32_t n = shared.GetNumThreads();
std::vector<ThreadState*> threads(n);
for (uint32_t i = 0; i < n; i++) {
threads[i] = new ThreadState(i, &shared);
FLAGS_env->StartThread(ThreadBody, threads[i]);
}
// Each thread goes through the following states:
// initializing -> wait for others to init -> populate
// wait for others to populate -> verify -> done
{
MutexLock l(shared.GetMutex());
while (!shared.AllInitialized()) {
shared.GetCondVar()->Wait();
}
fprintf(stdout, "Starting to populate db\n");
shared.SetStart();
shared.GetCondVar()->SignalAll();
while (!shared.AllPopulated()) {
shared.GetCondVar()->Wait();
}
fprintf(stdout, "Starting verification\n");
shared.SetStartVerify();
shared.GetCondVar()->SignalAll();
while (!shared.AllDone()) {
shared.GetCondVar()->Wait();
}
}
for (int i = 1; i < n; i++) {
threads[0]->stats.Merge(threads[i]->stats);
}
threads[0]->stats.Report("Stress Test");
for (int i = 0; i < n; i++) {
delete threads[i];
threads[i] = NULL;
}
fprintf(stdout, "Verification successfull\n");
PrintStatistics();
}
private:
static void ThreadBody(void* v) {
ThreadState* thread = reinterpret_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->GetStressTest()->PopulateDb(thread);
{
MutexLock l(shared->GetMutex());
shared->IncPopulated();
if (shared->AllPopulated()) {
shared->GetCondVar()->SignalAll();
}
while (!shared->VerifyStarted()) {
shared->GetCondVar()->Wait();
}
}
thread->shared->GetStressTest()->VerifyDb(*(thread->shared), thread->tid);
{
MutexLock l(shared->GetMutex());
shared->IncDone();
if (shared->AllDone()) {
shared->GetCondVar()->SignalAll();
}
}
}
void PopulateDb(ThreadState* thread) {
ReadOptions read_opts(FLAGS_verify_checksum, true);
WriteOptions write_opts;
char value[100], prev_value[100];
long max_key = thread->shared->GetMaxKey();
std::string from_db;
if (FLAGS_sync) {
write_opts.sync = true;
}
write_opts.disableWAL = FLAGS_disable_wal;
thread->stats.Start();
for (long i=0; i < FLAGS_ops_per_thread; i++) {
long rand_key = thread->rand.Next() % max_key;
Slice key((char*)&rand_key, sizeof(rand_key));
if (FLAGS_readwritepercent > thread->rand.Uniform(100)) {
// introduce some read load.
db_->Get(read_opts, key, &from_db);
} else {
uint32_t value_base = thread->rand.Next();
size_t sz = GenerateValue(value_base, value, sizeof(value));
Slice v(value, sz);
{
MutexLock l(thread->shared->GetMutexForKey(rand_key));
if (FLAGS_verify_before_write) {
VerifyValue(rand_key, read_opts, *(thread->shared), prev_value,
sizeof(prev_value), &from_db, true);
}
thread->shared->Put(rand_key, value_base);
db_->Put(write_opts, key, v);
}
PrintKeyValue(rand_key, value, sz);
thread->stats.AddBytesForOneWrite(sz);
}
thread->stats.FinishedSingleOp();
}
thread->stats.Stop();
}
void VerifyDb(const SharedState &shared, long start) const {
ReadOptions options(FLAGS_verify_checksum, true);
char value[100];
long max_key = shared.GetMaxKey();
long step = shared.GetNumThreads();
for (long i = start; i < max_key; i+= step) {
std::string from_db;
VerifyValue(i, options, shared, value, sizeof(value), &from_db);
if (from_db.length()) {
PrintKeyValue(i, from_db.data(), from_db.length());
}
}
}
void VerificationAbort(std::string msg, long key) const {
fprintf(stderr, "Verification failed for key %ld: %s\n",
key, msg.c_str());
exit(1);
}
void VerifyValue(long key, const ReadOptions &opts, const SharedState &shared,
char *value, size_t value_sz,
std::string *value_from_db, bool strict=false) const {
Slice k((char*)&key, sizeof(key));
uint32_t value_base = shared.Get(key);
if (value_base == SharedState::SENTINEL && !strict) {
return;
}
if (db_->Get(opts, k, value_from_db).ok()) {
if (value_base == SharedState::SENTINEL) {
VerificationAbort("Unexpected value found", key);
}
size_t sz = GenerateValue(value_base, value, value_sz);
if (value_from_db->length() != sz) {
VerificationAbort("Length of value read is not equal", key);
}
if (memcmp(value_from_db->data(), value, sz) != 0) {
VerificationAbort("Contents of value read don't match", key);
}
} else {
if (value_base != SharedState::SENTINEL) {
VerificationAbort("Value not found", key);
}
}
}
static void PrintKeyValue(uint32_t key, const char *value, size_t sz) {
if (!FLAGS_verbose) return;
fprintf(stdout, "%u ==> (%u) ", key, sz);
for (size_t i=0; i<sz; i++) {
fprintf(stdout, "%X", value[i]);
}
fprintf(stdout, "\n");
}
static size_t GenerateValue(uint32_t rand, char *v, size_t max_sz) {
size_t value_sz = ((rand % 3) + 1) * FLAGS_value_size_mult;
assert(value_sz <= max_sz && value_sz >= sizeof(uint32_t));
*((uint32_t*)v) = rand;
char c = (char) rand;
for (size_t i=sizeof(uint32_t); i < value_sz; i++) {
v[i] = (char)(rand ^ i);
}
return value_sz; // the size of the value set.
}
void PrintEnv() const {
fprintf(stdout, "LevelDB version : %d.%d\n",
kMajorVersion, kMinorVersion);
fprintf(stdout, "Number of threads : %d\n", FLAGS_threads);
fprintf(stdout, "Ops per thread : %ld\n", FLAGS_ops_per_thread);
fprintf(stdout, "Read percentage : %ld\n", FLAGS_readwritepercent);
fprintf(stdout, "Max key : %ld\n", FLAGS_max_key);
fprintf(stdout, "Num keys per lock : %ld\n",
1 << FLAGS_log2_keys_per_lock);
char* compression;
switch (FLAGS_compression_type) {
case leveldb::kNoCompression:
compression = (char *)std::string("none").c_str();
break;
case leveldb::kSnappyCompression:
compression = (char *)std::string("snappy").c_str();
break;
case leveldb::kZlibCompression:
compression = (char *)std::string("zlib").c_str();
break;
case leveldb::kBZip2Compression:
compression = (char *)std::string("bzip2").c_str();
break;
}
fprintf(stdout, "Compression : %s\n", compression);
fprintf(stdout, "------------------------------------------------\n");
}
void Open() {
assert(db_ == NULL);
Options options;
options.block_cache = cache_;
options.write_buffer_size = FLAGS_write_buffer_size;
options.block_size = FLAGS_block_size;
options.filter_policy = filter_policy_;
options.max_open_files = FLAGS_open_files;
options.statistics = dbstats;
options.env = FLAGS_env;
options.disableDataSync = FLAGS_disable_data_sync;
options.use_fsync = FLAGS_use_fsync;
options.target_file_size_base = FLAGS_target_file_size_base;
options.target_file_size_multiplier = FLAGS_target_file_size_multiplier;
options.max_bytes_for_level_base = FLAGS_max_bytes_for_level_base;
options.max_bytes_for_level_multiplier =
FLAGS_max_bytes_for_level_multiplier;
options.level0_stop_writes_trigger = FLAGS_level0_stop_writes_trigger;
options.level0_slowdown_writes_trigger =
FLAGS_level0_slowdown_writes_trigger;
options.compression = FLAGS_compression_type;
options.create_if_missing = true;
options.disable_seek_compaction = FLAGS_disable_seek_compaction;
Status s = DB::Open(options, FLAGS_db, &db_);
if (!s.ok()) {
fprintf(stderr, "open error: %s\n", s.ToString().c_str());
exit(1);
}
}
void PrintStatistics() {
if (dbstats) {
fprintf(stdout, "File opened:%ld closed:%ld errors:%ld\n",
dbstats->getNumFileOpens(),
dbstats->getNumFileCloses(),
dbstats->getNumFileErrors());
}
}
private:
Cache* cache_;
const FilterPolicy* filter_policy_;
DB* db_;
};
} // namespace leveldb
int main(int argc, char** argv) {
FLAGS_write_buffer_size = leveldb::Options().write_buffer_size;
FLAGS_open_files = leveldb::Options().max_open_files;
// Compression test code above refers to FLAGS_block_size
FLAGS_block_size = leveldb::Options().block_size;
std::string default_db_path;
for (int i = 1; i < argc; i++) {
double d;
int n;
uint32_t u;
long l;
char junk;
char hdfsname[2048];
if (sscanf(argv[i], "--seed=%uf%c", &u, &junk) == 1) {
FLAGS_seed = u;
} else if (sscanf(argv[i], "--max_key=%ld%c", &l, &junk) == 1) {
FLAGS_max_key = l;
} else if (sscanf(argv[i], "--log2_keys_per_lock=%u%c", &u, &junk) == 1) {
FLAGS_log2_keys_per_lock = u;
} else if (sscanf(argv[i], "--ops_per_thread=%u%c", &u, &junk) == 1) {
FLAGS_ops_per_thread = u;
} else if (sscanf(argv[i], "--verbose=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
FLAGS_verbose = n;
} else if (sscanf(argv[i], "--histogram=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
FLAGS_histogram = n;
} else if (sscanf(argv[i], "--verify_before_write=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
FLAGS_verify_before_write = n;
} else if (sscanf(argv[i], "--threads=%d%c", &n, &junk) == 1) {
FLAGS_threads = n;
} else if (sscanf(argv[i], "--value_size_mult=%d%c", &n, &junk) == 1) {
FLAGS_value_size_mult = n;
} else if (sscanf(argv[i], "--write_buffer_size=%d%c", &n, &junk) == 1) {
FLAGS_write_buffer_size = n;
} else if (sscanf(argv[i], "--cache_size=%ld%c", &l, &junk) == 1) {
FLAGS_cache_size = l;
} else if (sscanf(argv[i], "--block_size=%d%c", &n, &junk) == 1) {
FLAGS_block_size = n;
} else if (sscanf(argv[i], "--bloom_bits=%d%c", &n, &junk) == 1) {
FLAGS_bloom_bits = n;
} else if (sscanf(argv[i], "--open_files=%d%c", &n, &junk) == 1) {
FLAGS_open_files = n;
} else if (strncmp(argv[i], "--db=", 5) == 0) {
FLAGS_db = argv[i] + 5;
} else if (sscanf(argv[i], "--verify_checksum=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
FLAGS_verify_checksum = n;
} else if (sscanf(argv[i], "--bufferedio=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
useOsBuffer = n;
} else if (sscanf(argv[i], "--mmap_read=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
useMmapRead = n;
} else if (sscanf(argv[i], "--readhead=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
useFsReadAhead = n;
} else if (sscanf(argv[i], "--statistics=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
if (n == 1) {
dbstats = new leveldb::DBStatistics();
}
} else if (sscanf(argv[i], "--sync=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
FLAGS_sync = n;
} else if (sscanf(argv[i], "--readwritepercent=%d%c", &n, &junk) == 1 &&
(n > 0 || n < 100)) {
FLAGS_readwritepercent = n;
} else if (sscanf(argv[i], "--disable_data_sync=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
FLAGS_disable_data_sync = n;
} else if (sscanf(argv[i], "--use_fsync=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
FLAGS_use_fsync = n;
} else if (sscanf(argv[i], "--disable_wal=%d%c", &n, &junk) == 1 &&
(n == 0 || n == 1)) {
FLAGS_disable_wal = n;
} else if (sscanf(argv[i], "--hdfs=%s", hdfsname) == 1) {
FLAGS_env = new leveldb::HdfsEnv(hdfsname);
} else if (sscanf(argv[i], "--target_file_size_base=%d%c",
&n, &junk) == 1) {
FLAGS_target_file_size_base = n;
} else if ( sscanf(argv[i], "--target_file_size_multiplier=%d%c",
&n, &junk) == 1) {
FLAGS_target_file_size_multiplier = n;
} else if (
sscanf(argv[i], "--max_bytes_for_level_base=%d%c", &n, &junk) == 1) {
FLAGS_max_bytes_for_level_base = n;
} else if (sscanf(argv[i], "--max_bytes_for_level_multiplier=%d%c",
&n, &junk) == 1) {
FLAGS_max_bytes_for_level_multiplier = n;
} else if (sscanf(argv[i],"--level0_stop_writes_trigger=%d%c",
&n, &junk) == 1) {
FLAGS_level0_stop_writes_trigger = n;
} else if (sscanf(argv[i],"--level0_slowdown_writes_trigger=%d%c",
&n, &junk) == 1) {
FLAGS_level0_slowdown_writes_trigger = n;
} else if (strncmp(argv[i], "--compression_type=", 19) == 0) {
const char* ctype = argv[i] + 19;
if (!strcasecmp(ctype, "none"))
FLAGS_compression_type = leveldb::kNoCompression;
else if (!strcasecmp(ctype, "snappy"))
FLAGS_compression_type = leveldb::kSnappyCompression;
else if (!strcasecmp(ctype, "zlib"))
FLAGS_compression_type = leveldb::kZlibCompression;
else if (!strcasecmp(ctype, "bzip2"))
FLAGS_compression_type = leveldb::kBZip2Compression;
else {
fprintf(stdout, "Cannot parse %s\n", argv[i]);
}
} else if (sscanf(argv[i], "--disable_seek_compaction=%d%c", &n, &junk) == 1
&& (n == 0 || n == 1)) {
FLAGS_disable_seek_compaction = n;
} else {
fprintf(stderr, "Invalid flag '%s'\n", argv[i]);
exit(1);
}
}
// Choose a location for the test database if none given with --db=<path>
if (FLAGS_db == NULL) {
leveldb::Env::Default()->GetTestDirectory(&default_db_path);
default_db_path += "/dbstress";
FLAGS_db = default_db_path.c_str();
}
leveldb::StressTest stress;
stress.Run();
if (dbstats) {
delete dbstats;
}
return 0;
}
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