1 files changed, 88 insertions, 0 deletions
diff --git a/src/rocksdb/util/log_write_bench.cc b/src/rocksdb/util/log_write_bench.cc
new file mode 100644
index 000000000..c1637db15
--- /dev/null
+++ b/src/rocksdb/util/log_write_bench.cc
@@ -0,0 +1,88 @@
+//  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).
+
+#ifndef GFLAGS
+#include <cstdio>
+int main() {
+  fprintf(stderr, "Please install gflags to run rocksdb tools\n");
+  return 1;
+}
+#else
+
+#include "file/writable_file_writer.h"
+#include "monitoring/histogram.h"
+#include "rocksdb/env.h"
+#include "rocksdb/system_clock.h"
+#include "test_util/testharness.h"
+#include "test_util/testutil.h"
+#include "util/gflags_compat.h"
+
+using GFLAGS_NAMESPACE::ParseCommandLineFlags;
+using GFLAGS_NAMESPACE::SetUsageMessage;
+
+// A simple benchmark to simulate transactional logs
+
+DEFINE_int32(num_records, 6000, "Number of records.");
+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_NAMESPACE {
+void RunBenchmark() {
+  std::string file_name = test::PerThreadDBPath("log_write_benchmark.log");
+  DBOptions options;
+  Env* env = Env::Default();
+  const auto& clock = env->GetSystemClock();
+  EnvOptions env_options = env->OptimizeForLogWrite(EnvOptions(), options);
+  env_options.bytes_per_sync = FLAGS_bytes_per_sync;
+  std::unique_ptr<WritableFile> file;
+  env->NewWritableFile(file_name, &file, env_options);
+  std::unique_ptr<WritableFileWriter> writer;
+  writer.reset(new WritableFileWriter(std::move(file), file_name, env_options,
+                                      clock, nullptr /* stats */,
+                                      options.listeners));
+
+  std::string record;
+  record.assign(FLAGS_record_size, 'X');
+
+  HistogramImpl hist;
+
+  uint64_t start_time = clock->NowMicros();
+  for (int i = 0; i < FLAGS_num_records; i++) {
+    uint64_t start_nanos = clock->NowNanos();
+    writer->Append(record);
+    writer->Flush();
+    if (FLAGS_enable_sync) {
+      writer->Sync(false);
+    }
+    hist.Add(clock->NowNanos() - start_nanos);
+
+    if (i % 1000 == 1) {
+      fprintf(stderr, "Wrote %d records...\n", i);
+    }
+
+    int time_to_sleep =
+        (i + 1) * FLAGS_record_interval - (clock->NowMicros() - start_time);
+    if (time_to_sleep > 0) {
+      clock->SleepForMicroseconds(time_to_sleep);
+    }
+  }
+
+  fprintf(stderr, "Distribution of latency of append+flush: \n%s",
+          hist.ToString().c_str());
+}
+}  // namespace ROCKSDB_NAMESPACE
+
+int main(int argc, char** argv) {
+  SetUsageMessage(std::string("\nUSAGE:\n") + std::string(argv[0]) +
+                  " [OPTIONS]...");
+  ParseCommandLineFlags(&argc, &argv, true);
+
+  ROCKSDB_NAMESPACE::RunBenchmark();
+  return 0;
+}
+
+#endif  // GFLAGS