benchmarks/db_bench_sqlite3.cc [238:319]:
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      std::fprintf(stderr, "CPUCache:   %s\n", cache_size.c_str());
    }
#endif
  }

  void Start() {
    start_ = Env::Default()->NowMicros() * 1e-6;
    bytes_ = 0;
    message_.clear();
    last_op_finish_ = start_;
    hist_.Clear();
    done_ = 0;
    next_report_ = 100;
  }

  void FinishedSingleOp() {
    if (FLAGS_histogram) {
      double now = Env::Default()->NowMicros() * 1e-6;
      double micros = (now - last_op_finish_) * 1e6;
      hist_.Add(micros);
      if (micros > 20000) {
        std::fprintf(stderr, "long op: %.1f micros%30s\r", micros, "");
        std::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;
      std::fprintf(stderr, "... finished %d ops%30s\r", done_, "");
      std::fflush(stderr);
    }
  }

  void Stop(const Slice& name) {
    double finish = Env::Default()->NowMicros() * 1e-6;

    // Pretend at least one op was done in case we are running a benchmark
    // that does not call FinishedSingleOp().
    if (done_ < 1) done_ = 1;

    if (bytes_ > 0) {
      char rate[100];
      std::snprintf(rate, sizeof(rate), "%6.1f MB/s",
                    (bytes_ / 1048576.0) / (finish - start_));
      if (!message_.empty()) {
        message_ = std::string(rate) + " " + message_;
      } else {
        message_ = rate;
      }
    }

    std::fprintf(stdout, "%-12s : %11.3f micros/op;%s%s\n",
                 name.ToString().c_str(), (finish - start_) * 1e6 / done_,
                 (message_.empty() ? "" : " "), message_.c_str());
    if (FLAGS_histogram) {
      std::fprintf(stdout, "Microseconds per op:\n%s\n",
                   hist_.ToString().c_str());
    }
    std::fflush(stdout);
  }

 public:
  enum Order { SEQUENTIAL, RANDOM };
  enum DBState { FRESH, EXISTING };

  Benchmark()
      : db_(nullptr),
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benchmarks/db_bench_tree_db.cc [216:297]:
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      std::fprintf(stderr, "CPUCache:       %s\n", cache_size.c_str());
    }
#endif
  }

  void Start() {
    start_ = Env::Default()->NowMicros() * 1e-6;
    bytes_ = 0;
    message_.clear();
    last_op_finish_ = start_;
    hist_.Clear();
    done_ = 0;
    next_report_ = 100;
  }

  void FinishedSingleOp() {
    if (FLAGS_histogram) {
      double now = Env::Default()->NowMicros() * 1e-6;
      double micros = (now - last_op_finish_) * 1e6;
      hist_.Add(micros);
      if (micros > 20000) {
        std::fprintf(stderr, "long op: %.1f micros%30s\r", micros, "");
        std::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;
      std::fprintf(stderr, "... finished %d ops%30s\r", done_, "");
      std::fflush(stderr);
    }
  }

  void Stop(const Slice& name) {
    double finish = Env::Default()->NowMicros() * 1e-6;

    // Pretend at least one op was done in case we are running a benchmark
    // that does not call FinishedSingleOp().
    if (done_ < 1) done_ = 1;

    if (bytes_ > 0) {
      char rate[100];
      std::snprintf(rate, sizeof(rate), "%6.1f MB/s",
                    (bytes_ / 1048576.0) / (finish - start_));
      if (!message_.empty()) {
        message_ = std::string(rate) + " " + message_;
      } else {
        message_ = rate;
      }
    }

    std::fprintf(stdout, "%-12s : %11.3f micros/op;%s%s\n",
                 name.ToString().c_str(), (finish - start_) * 1e6 / done_,
                 (message_.empty() ? "" : " "), message_.c_str());
    if (FLAGS_histogram) {
      std::fprintf(stdout, "Microseconds per op:\n%s\n",
                   hist_.ToString().c_str());
    }
    std::fflush(stdout);
  }

 public:
  enum Order { SEQUENTIAL, RANDOM };
  enum DBState { FRESH, EXISTING };

  Benchmark()
      : db_(nullptr),
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