NAM_BACKUP

NAM_BACKUP content

Fortran name	Fortran type	Default value
XBAK_TIME	REAL(:,:)	-999.0
NBAK_STEP	INTEGER(:,:)	-999
XBAK_TIME_FREQ	REAL(:)	-999.0
XBAK_TIME_FREQ_FIRST	REAL(:)	-999.0
NBAK_STEP_FREQ	INTEGER(:)	-999
NBAK_STEP_FREQ_FIRST	INTEGER(:)	-999
LBAK_BEG	LOGICAL	.FALSE.
LBAK_END	LOGICAL	.FALSE.
LBAK_REDUCE_FLOAT_PRECISION	LOGICAL(:)	.FALSE.
LBAK_COMPRESS	LOGICAL(:)	.FALSE.
NBAK_COMPRESS_LEVEL	INTEGER(:)	4
CBAK_DIR	CHARACTER(LEN=512)

• XBAK_TIME(m,i) : array of increments in seconds from the beginning of the segment to the instant where the i-th backup is realized by the model m

• NBAK_STEP(m,i) : array of increments in timesteps from the beginning of the segment to the instant where the i-th backup is realized by the model m

• XBAK_TIME_FREQ(m) : time between 2 backups for each model m

• XBAK_TIME_FREQ_FIRST(m) : time of the first backup for each model m (if XBAK_TIME_FREQ(m) is set). If not set, the first backup will be at time = XBAK_TIME_FREQ.

• NBAK_STEP_FREQ(m) : number of timesteps between 2 backups for each model m

• NBAK_STEP_FREQ_FIRST(m) : timestep number of the first backup for each model m (if NBAK_STEP_FREQ(m) is set). If not set, the first backup will be at time = NBAK_STEP_FREQ.

• LBAK_BEG : force a backup at the first timestep

• LBAK_END : force a backup at the last timestep

• LBAK_REDUCE_FLOAT_PRECISION(m) : force writing of floating points numbers in single precision for each model m. This option can not be enabled if LIO_ALLOW_REDUCED_PRECISION_BACKUP has not been forced to .TRUE. in NAM_CONFIO. Be careful, this loss of precision could impact restarted computations. This option should only be used if you understand the risks.

• LBAK_COMPRESS(m) : enable lossless compression of data for each model m. This can have a negative impact on performance. This option loses precedence over LIO_COMPRESS of NAM_CONFIO.

• LBAK_COMPRESS_LEVEL(m) : set the compression level for each model m. The value must be in the 0 to 9 interval (0 for no compression, 9 for maximum compression). This option loses precedence over LIO_COMPRESS_LEVEL of NAM_CONFIO if LIO_COMPRESS=.TRUE.

• CBAK_DIR : directory used to write backups and diachronic files (current directory by default). It overrides CIO_DIR.

Note

• A choosen time must be a multiple of the timestep.

• Different ways to choose the backup times can be combined: a regular series (given with a frequency) + irregular times. Duplicate times will be automatically removed.

• In grid-nesting, backup times are propagated from the parent model to its children (children are allowed to have other backup times). Children regular series must be aligned with parent ones. A regular parent backup must always be at the same time than a regular children backup. However, children may have more frequent regular backups (parent time frequency must be a multiple of children frequencies).