ca-bench.H

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/*
                          Aleph_w
 
  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2026 Leandro Rabindranath Leon
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
 
#ifndef CA_BENCH_H
#define CA_BENCH_H
 
#include <chrono>
#include <cstddef>
#include <cstdio>
#include <utility>
 
namespace Aleph {
namespace CA {
 
class Bench_Timer
{
  using clock_type = std::chrono::steady_clock;
  using time_point = clock_type::time_point;
  time_point start_ = clock_type::now();
 
public:
  void restart() noexcept
  {
    start_ = clock_type::now();
  }
 
  [[nodiscard]] double elapsed_seconds() const noexcept
  {
    const auto now = clock_type::now();
    const std::chrono::duration<double> d = now - start_;
    return d.count();
  }
 
  [[nodiscard]] double elapsed_milliseconds() const noexcept
  {
    return elapsed_seconds() * 1e3;
  }
};
 
template <typename F>
[[nodiscard]] inline double bench_seconds(F &&f)
{
  Bench_Timer t;
  std::forward<F>(f)();
  return t.elapsed_seconds();
}
 
[[nodiscard]] inline const char *format_throughput(double cells_per_second)
{
  thread_local char buf[64];
  if (const double abs_rate = cells_per_second < 0 ? -cells_per_second : cells_per_second;
      abs_rate >= 1e9)
    std::snprintf(buf, sizeof(buf), "%6.2f G cells/s", cells_per_second / 1e9);
  else if (abs_rate >= 1e6)
    std::snprintf(buf, sizeof(buf), "%6.2f M cells/s", cells_per_second / 1e6);
  else if (abs_rate >= 1e3)
    std::snprintf(buf, sizeof(buf), "%6.2f K cells/s", cells_per_second / 1e3);
  else
    std::snprintf(buf, sizeof(buf), "%6.2f   cells/s", cells_per_second);
  return buf;
}
 
}  // namespace CA
}  // namespace Aleph
 
#endif  // CA_BENCH_H