rocksdb/util/log_write_bench.cc

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#include <gflags/gflags.h>
#include "rocksdb/env.h"
#include "util/histogram.h"
#include "util/testharness.h"
#include "util/testutil.h"
// A simple benchmark to simulate transactional logs
DEFINE_int32(num_records, 6000, "Size of each record.");
DEFINE_int32(record_size, 249, "Size of each record.");
DEFINE_int32(record_interval, 10000, "Interval between records (microSec)");
DEFINE_int32(bytes_per_sync, 0, "bytes_per_sync parameter in EnvOptions");
DEFINE_bool(enable_sync, false, "sync after each write.");
namespace rocksdb {
void RunBenchmark() {
std::string file_name = test::TmpDir() + "/log_write_bench.log";
Env* env = Env::Default();
EnvOptions env_options;
env_options.use_mmap_writes = false;
env_options.bytes_per_sync = FLAGS_bytes_per_sync;
unique_ptr<WritableFile> file;
env->NewWritableFile(file_name, &file, env_options);
std::string record;
record.assign('X', FLAGS_record_size);
HistogramImpl hist;
uint64_t start_time = env->NowMicros();
for (int i = 0; i < FLAGS_num_records; i++) {
uint64_t start_nanos = env->NowNanos();
file->Append(record);
file->Flush();
if (FLAGS_enable_sync) {
file->Sync();
}
hist.Add(env->NowNanos() - start_nanos);
if (i % 1000 == 1) {
fprintf(stderr, "Wrote %d records...\n", i);
}
int time_to_sleep =
(i + 1) * FLAGS_record_interval - (env->NowMicros() - start_time);
if (time_to_sleep > 0) {
env->SleepForMicroseconds(time_to_sleep);
}
}
fprintf(stderr, "Distribution of latency of append+flush: \n%s",
hist.ToString().c_str());
}
} // namespace rocksdb
int main(int argc, char** argv) {
google::SetUsageMessage(std::string("\nUSAGE:\n") + std::string(argv[0]) +
" [OPTIONS]...");
google::ParseCommandLineFlags(&argc, &argv, true);
rocksdb::RunBenchmark();
return 0;
}