From GridLAB-D Wiki
TECHNICAL MANUAL
The checkpoint_type global variable specifies how the checkpoint_interval should be interpreted.
NONE
The checkpoint_type global variable is set to NONE when the checkpoint_interval is not to be used.
SIM
The checkpoint_type global variable is set to SIM when the checkpoint_interval is as a simulation time interval.
WALL
The checkpoint_type global variable is set to WALL when the checkpoint_interval is as a wall clock time interval.
GLM
#set checkpoint_type="WALL"
Command line
host% gridlabd -D checkpoint_type=WALL
Version
Checkpoints were introduced in Version 3.0.