Checkpoint / Restart

REMORA has a standard sort of checkpointing and restarting capability and uses the native AMReX format for reading and writing checkpoints. In the inputs file, the following options control the generation of checkpoint files (which are really directories):

Writing the Checkpoint “Files”

List of Parameters

Parameter	Definition	Acceptable Values	Default
remora.check_file	prefix for restart files	String	chk
remora.check_int	how often (by level-0 time steps) to write restart files	Integer \(> 0\)	-1
remora.check_int_time	how often (in simulation time in seconds) to write restart files	Real \(> 0\)	-1.0
remora.file_min_digits	Minimum number of digits in iteration number appended to plotfile and checkpoint files	Integer >= 0	5

Note: If both check_int and check_int_time are set, plotfile output will occur check_int steps or check_int_time simulation seconds after the last plotfile, whichever happens first.

Restarting

Parameter	Definition	Acceptable Values	Default
remora.restart	name of the file (directory) from which to restart files	String	not used if not set

Examples of Usage

• remora.check_file = chk_run

• remora.check_int = 10

  means that restart files (really directories) starting with the prefix “chk_run” will be generated every 10 level-0 time steps. The directory names will be chk_run00000, chk_run00010, chk_run00020, etc.

To restart from chk_run00061,for example, then set

• remora.restart = chk_run00061