Events::ObserveTimeStep< System > Class Template Reference

Observe the size of the time steps. More...

#include <ObserveTimeStep.hpp>

Classes
struct	ObservePerCore
struct	PrintTimeToTerminal
struct	SubfileName
	The name of the subfile inside the HDF5 file. More...

Public Types
using	options = tmpl::list< SubfileName, PrintTimeToTerminal, ObservePerCore >
using	observed_reduction_data_tags = observers::make_reduction_data_tags< tmpl::list< ReductionData > >
using	compute_tags_for_observation_box = tmpl::list<>
using	return_tags = tmpl::list<>
using	argument_tags = tmpl::list<::Tags::TimeStep, typename System::variables_tag >
using	observation_registration_tags = tmpl::list<>
using	is_ready_argument_tags = tmpl::list<>

Public Member Functions
	ObserveTimeStep (const std::string &subfile_name, bool output_time, bool observe_per_core)
template<typename ArrayIndex , typename ParallelComponent , typename Metavariables >
void	operator() (const TimeDelta &time_step, const typename System::variables_tag::type &variables, Parallel::GlobalCache< Metavariables > &cache, const ArrayIndex &array_index, const ParallelComponent *const, const ObservationValue &observation_value) const
std::pair< observers::TypeOfObservation, observers::ObservationKey >	get_observation_type_and_key_for_registration () const
template<typename Metavariables , typename ArrayIndex , typename Component >
bool	is_ready (Parallel::GlobalCache< Metavariables > &, const ArrayIndex &, const Component *const) const
bool	needs_evolved_variables () const override
	Whether the event uses anything depending on the evolved_variables. If this returns false, anything depending on the evolved variables may have an incorrect value when the event is run. More...
void	pup (PUP::er &p) override
Public Member Functions inherited from Event
	Event (CkMigrateMessage *msg)
	WRAPPED_PUPable_abstract (Event)
template<typename ComputeTagsList , typename DataBoxType , typename Metavariables , typename ArrayIndex , typename ComponentPointer >
void	run (const gsl::not_null< ObservationBox< ComputeTagsList, DataBoxType > * > box, Parallel::GlobalCache< Metavariables > &cache, const ArrayIndex &array_index, const ComponentPointer, const ObservationValue &observation_value) const
template<typename DbTags , typename Metavariables , typename ArrayIndex , typename ComponentPointer >
bool	is_ready (const db::DataBox< DbTags > &box, Parallel::GlobalCache< Metavariables > &cache, const ArrayIndex &array_index, const ComponentPointer) const
virtual bool	needs_evolved_variables () const =0
	Whether the event uses anything depending on the evolved_variables. If this returns false, anything depending on the evolved variables may have an incorrect value when the event is run. More...

Static Public Attributes
static constexpr Options::String	help

Detailed Description

template<typename System>
class Events::ObserveTimeStep< System >

Observe the size of the time steps.

Writes reduction quantities:

• Time
• NumberOfPoints
• Slab size
• Minimum time step
• Maximum time step
• Effective time step

The effective time step is the step size of a global-time-stepping method that would perform a similar amount of work. This is the harmonic mean of the step size over all grid points:

\begin{equation} (\Delta t)_{\text{eff}}^{-1} = \frac{\sum_{i \in \text{points}} (\Delta t)_i^{-1}}{N_{\text{points}}}. \end{equation}

This corresponds to averaging the number of steps per unit time taken by all points.

All values are reported as positive numbers, even for backwards evolutions.

Member Function Documentation

needs_evolved_variables()

template<typename System >

bool Events::ObserveTimeStep< System >::needs_evolved_variables ( ) const

overridevirtual

Whether the event uses anything depending on the evolved_variables. If this returns false, anything depending on the evolved variables may have an incorrect value when the event is run.

Implements Event.

Member Data Documentation

help

template<typename System >

constexpr Options::String Events::ObserveTimeStep< System >::help

staticconstexpr

Initial value:

=
      "Observe the size of the time steps.\n"
      "\n"
      "Writes reduction quantities:\n"
      "- Time\n"
      "- NumberOfPoints\n"
      "- Slab size\n"
      "- Minimum time step\n"
      "- Maximum time step\n"
      "- Effective time step\n"
      "\n"
      "The effective time step is the step size of a global-time-stepping\n"
      "method that would perform a similar amount of work.\n"
      "\n"
      "All values are reported as positive numbers, even for backwards\n"
      "evolutions."

---

The documentation for this class was generated from the following file:

• src/ParallelAlgorithms/Events/ObserveTimeStep.hpp