Checkpointing and Restarting

Removed feature

This functionality has been removed from the code since version 24.09.

If you wish to use this feature, we recommend that you continue to use Version 5.3.1. There is no difference in calculation results between versions 24.09 and 5.3.1.

Some large-scale computers limit the computational time of a single job. To achieve long-duration computation, OpenSWPC can export all memory contents to files at specific times (checkpointing), and then continue the simulation as another job (restarting).

If this function is turned on, OpenSWPC will terminate the computation after an elapsed time of ckp_time (in seconds) and will export all memory images.

For the next job, OpenSWPC first tries to find the directory cdir to locate the checkpointing file. If there are checkpointing files, OpenSWPC reads them to continue the simulation. Otherwise, OpenSWPC starts the simulation from scratch.

After finishing the computation of all time steps, OpenSWPC removes most of the contents of the checkpointing files. However, it does not delete the checkpointing files. This is to avoid unexpectedly starting the computation from the beginning and overwriting the output files.

This function is only available for the three-dimensional simulation code (swpc_3d.x).

Parameters

is_ckp

The flag to use checkpointing/restarting.

cdir

Output directory name of the checkpointing file. At restart, the checkpointing files are assumed to be in this directory.

ckp_time

Checkpointing time in seconds.

ckp_interval

Investigate if the computation time exceeds ckp_time periodically at this interval. Setting this interval step as too small may affect the performance of the computation.