ceph/src/rocksdb/util/log_write_bench.cc

   1 //  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5
   6 #ifndef GFLAGS
   7 #include <cstdio>
   8 int main() {
   9   fprintf(stderr, "Please install gflags to run rocksdb tools\n");
  10   return 1;
  11 }
  12 #else
  13
  14 #include "monitoring/histogram.h"
  15 #include "rocksdb/env.h"
  16 #include "util/file_reader_writer.h"
  17 #include "util/gflags_compat.h"
  18 #include "util/testharness.h"
  19 #include "util/testutil.h"
  20
  21 using GFLAGS_NAMESPACE::ParseCommandLineFlags;
  22 using GFLAGS_NAMESPACE::SetUsageMessage;
  23
  24 // A simple benchmark to simulate transactional logs
  25
  26 DEFINE_int32(num_records, 6000, "Number of records.");
  27 DEFINE_int32(record_size, 249, "Size of each record.");
  28 DEFINE_int32(record_interval, 10000, "Interval between records (microSec)");
  29 DEFINE_int32(bytes_per_sync, 0, "bytes_per_sync parameter in EnvOptions");
  30 DEFINE_bool(enable_sync, false, "sync after each write.");
  31
  32 namespace rocksdb {
  33 void RunBenchmark() {
  34   std::string file_name = test::PerThreadDBPath("log_write_benchmark.log");
  35   Env* env = Env::Default();
  36   EnvOptions env_options = env->OptimizeForLogWrite(EnvOptions());
  37   env_options.bytes_per_sync = FLAGS_bytes_per_sync;
  38   std::unique_ptr<WritableFile> file;
  39   env->NewWritableFile(file_name, &file, env_options);
  40   std::unique_ptr<WritableFileWriter> writer;
  41   writer.reset(new WritableFileWriter(std::move(file), env_options));
  42
  43   std::string record;
  44   record.assign(FLAGS_record_size, 'X');
  45
  46   HistogramImpl hist;
  47
  48   uint64_t start_time = env->NowMicros();
  49   for (int i = 0; i < FLAGS_num_records; i++) {
  50     uint64_t start_nanos = env->NowNanos();
  51     writer->Append(record);
  52     writer->Flush();
  53     if (FLAGS_enable_sync) {
  54       writer->Sync(false);
  55     }
  56     hist.Add(env->NowNanos() - start_nanos);
  57
  58     if (i % 1000 == 1) {
  59       fprintf(stderr, "Wrote %d records...\n", i);
  60     }
  61
  62     int time_to_sleep =
  63         (i + 1) * FLAGS_record_interval - (env->NowMicros() - start_time);
  64     if (time_to_sleep > 0) {
  65       env->SleepForMicroseconds(time_to_sleep);
  66     }
  67   }
  68
  69   fprintf(stderr, "Distribution of latency of append+flush: \n%s",
  70           hist.ToString().c_str());
  71 }
  72 }  // namespace rocksdb
  73
  74 int main(int argc, char** argv) {
  75   SetUsageMessage(std::string("\nUSAGE:\n") + std::string(argv[0]) +
  76                   " [OPTIONS]...");
  77   ParseCommandLineFlags(&argc, &argv, true);
  78
  79   rocksdb::RunBenchmark();
  80   return 0;
  81 }
  82
  83 #endif  // GFLAGS