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 the BSD-style license found in the
   3 //  LICENSE file in the root directory of this source tree. An additional grant
   4 //  of patent rights can be found in the PATENTS file in the same 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 <gflags/gflags.h>
  15
  16 #include "monitoring/histogram.h"
  17 #include "rocksdb/env.h"
  18 #include "util/file_reader_writer.h"
  19 #include "util/testharness.h"
  20 #include "util/testutil.h"
  21
  22 using GFLAGS::ParseCommandLineFlags;
  23 using GFLAGS::SetUsageMessage;
  24
  25 // A simple benchmark to simulate transactional logs
  26
  27 DEFINE_int32(num_records, 6000, "Number of records.");
  28 DEFINE_int32(record_size, 249, "Size of each record.");
  29 DEFINE_int32(record_interval, 10000, "Interval between records (microSec)");
  30 DEFINE_int32(bytes_per_sync, 0, "bytes_per_sync parameter in EnvOptions");
  31 DEFINE_bool(enable_sync, false, "sync after each write.");
  32
  33 namespace rocksdb {
  34 void RunBenchmark() {
  35   std::string file_name = test::TmpDir() + "/log_write_benchmark.log";
  36   Env* env = Env::Default();
  37   EnvOptions env_options = env->OptimizeForLogWrite(EnvOptions());
  38   env_options.bytes_per_sync = FLAGS_bytes_per_sync;
  39   unique_ptr<WritableFile> file;
  40   env->NewWritableFile(file_name, &file, env_options);
  41   unique_ptr<WritableFileWriter> writer;
  42   writer.reset(new WritableFileWriter(std::move(file), env_options));
  43
  44   std::string record;
  45   record.assign(FLAGS_record_size, 'X');
  46
  47   HistogramImpl hist;
  48
  49   uint64_t start_time = env->NowMicros();
  50   for (int i = 0; i < FLAGS_num_records; i++) {
  51     uint64_t start_nanos = env->NowNanos();
  52     writer->Append(record);
  53     writer->Flush();
  54     if (FLAGS_enable_sync) {
  55       writer->Sync(false);
  56     }
  57     hist.Add(env->NowNanos() - start_nanos);
  58
  59     if (i % 1000 == 1) {
  60       fprintf(stderr, "Wrote %d records...\n", i);
  61     }
  62
  63     int time_to_sleep =
  64         (i + 1) * FLAGS_record_interval - (env->NowMicros() - start_time);
  65     if (time_to_sleep > 0) {
  66       env->SleepForMicroseconds(time_to_sleep);
  67     }
  68   }
  69
  70   fprintf(stderr, "Distribution of latency of append+flush: \n%s",
  71           hist.ToString().c_str());
  72 }
  73 }  // namespace rocksdb
  74
  75 int main(int argc, char** argv) {
  76   SetUsageMessage(std::string("\nUSAGE:\n") + std::string(argv[0]) +
  77                   " [OPTIONS]...");
  78   ParseCommandLineFlags(&argc, &argv, true);
  79
  80   rocksdb::RunBenchmark();
  81   return 0;
  82 }
  83
  84 #endif  // GFLAGS