celeritas::RootStepWriter Class Reference

Write "MC truth" data to ROOT at every step. More...

#include <RootStepWriter.hh>

Inheritance diagram for celeritas::RootStepWriter:

Classes
struct	TStepData
	Truth step data; Naming convention must match StepStateData. More...
struct	TStepPoint
	Truth step point data; Naming convention must match StepPointStateData. More...

Public Types
Type aliases
using	SPRootFileManager = std::shared_ptr< RootFileManager >
using	SPParticleParams = std::shared_ptr< ParticleParams const >
using	WriteFilter = std::function< bool(TStepData const &)>
Public Types inherited from celeritas::StepInterface
using	HostStepState = StepState< MemSpace::host >
	Detector filtering required for this interface.
using	DeviceStepState = StepState< MemSpace::device >
	Detector filtering required for this interface.
using	MapVolumeDetector = std::map< VolumeId, DetectorId >
	Detector filtering required for this interface.

Public Member Functions
	RootStepWriter (SPRootFileManager root_manager, SPParticleParams particle_params, StepSelection selection, WriteFilter filter)
	Construct writer with user-defined data filtering.
	RootStepWriter (SPRootFileManager root_manager, SPParticleParams particle_params, StepSelection selection)
	Construct writer without data filtering.
void	set_auto_flush (long num_entries)
	Set the number of entries before flushing to disk. More...
void	process_steps (HostStepState) final
	Collect step data and fill the ROOT TTree for all active threads.
void	process_steps (DeviceStepState) final
	Process CPU-generated hit data.
StepSelection	selection () const final
	Selection of data required for this interface.
Filters	filters () const final
	Detector filtering required for this interface.
Public Member Functions inherited from celeritas::StepInterface

Static Public Attributes
static constexpr size_type	unspecified {static_cast<size_type>(-1)}

Additional Inherited Members
Protected Member Functions inherited from celeritas::StepInterface
	~StepInterface ()=default
	Detector filtering required for this interface.

Detailed Description

Write "MC truth" data to ROOT at every step.

TTree::Fill() is called for each step and thread id, making each ROOT entry a step. Since the ROOT data is stored in branches with primitive types instead of a full struct, no dictionaries are needed for reading the output file.

The step data that is written to the ROOT file can be filtered by providing a user-defined WriteFilter function.

Member Function Documentation

set_auto_flush()

void celeritas::RootStepWriter::set_auto_flush

(

long

num_entries

)

Set the number of entries before flushing to disk.

This sets the number of steps stored in memory before ROOT flushes the data to disk. Default is ~32MB of compressed data.

See SetAutoFlush in ROOT TTree Class reference for details: https://root.cern.ch/doc/master/classTTree.html

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

• RootStepWriter.hh
• RootStepWriter.cc