restart_data.h

/*  ______________________________________________________________________
 *
 *  ExaDG - High-Order Discontinuous Galerkin for the Exa-Scale
 *
 *  Copyright (C) 2021 by the ExaDG authors
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *  ______________________________________________________________________
 */
 
#ifndef INCLUDE_FUNCTIONALITIES_RESTART_DATA_H_
#define INCLUDE_FUNCTIONALITIES_RESTART_DATA_H_
 
// C/C++
#include <limits>
 
// deal.II
#include <deal.II/base/conditional_ostream.h>
 
// ExaDG
#include <exadg/utilities/numbers.h>
#include <exadg/utilities/print_functions.h>
 
namespace ExaDG
{
struct RestartData
{
  RestartData()
    : write_restart(false),
      interval_time(std::numeric_limits<double>::max()),
      interval_wall_time(std::numeric_limits<double>::max()),
      interval_time_steps(std::numeric_limits<unsigned int>::max()),
      filename("restart"),
      counter(1)
  {
  }
 
  void
  print(dealii::ConditionalOStream const & pcout) const
  {
    pcout << "  Restart:" << std::endl;
    print_parameter(pcout, "Write restart", write_restart);
 
    if(write_restart == true)
    {
      print_parameter(pcout, "Interval physical time", interval_time);
      print_parameter(pcout, "Interval wall time", interval_wall_time);
      print_parameter(pcout, "Interval time steps", interval_time_steps);
      print_parameter(pcout, "Filename", filename);
    }
  }
 
  bool
  do_restart(double const           wall_time,
             double const           time,
             types::time_step const time_step_number,
             bool const             reset_counter) const
  {
    // After a restart, the counter is reset to 1, but time = current_time - start time != 0 after a
    // restart. Hence, we have to explicitly reset the counter in that case. There is nothing to do
    // if the restart is controlled by the wall time or the time_step_number because these
    // variables are reinitialized after a restart anyway.
    if(reset_counter)
      counter += int((time + 1.e-10) / interval_time);
 
    bool do_restart = wall_time > interval_wall_time * counter or time > interval_time * counter or
                      time_step_number > interval_time_steps * counter;
 
    if(do_restart)
      ++counter;
 
    return do_restart;
  }
 
  bool write_restart;
 
  // physical time
  double interval_time;
 
  // wall time in seconds (= hours * 3600)
  double interval_wall_time;
 
  // number of time steps after which to write restart
  unsigned int interval_time_steps;
 
  // filename for restart files
  std::string filename;
 
  // counter needed do decide when to write restart
  mutable unsigned int counter;
};
 
} // namespace ExaDG
 
#endif /* INCLUDE_FUNCTIONALITIES_RESTART_DATA_H_ */