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Restarting a simulation
You are here: Home > PIConGPU User Documentation > Restarting a simulation
PIConGPU supports restarting the simulation run from checkpoints stored on disk.
Checkpoints are special dumps of the simulation data that contain all information required for a restart.
This may include internal data that is not required/intended for post-processing or analysis.
To enable checkpoints, add the --checkpoints <frequency> flag to the PIConGPU command line, specifying the frequency with which checkpoints should be created.
Plugins will receive a special notification for a checkpoint in addition to the standard notification, triggered every <plugin>.period steps. Note that some plugins might specify additional parameters for checkpoints and must be set to enable checkpointing for this plugin.
Since restarts require all field and particle data, the HDF5Writer plugin must be enabled. Optionally, the flag hdf5.checkpoint-file <filename prefix> may be set to specify a special filename for checkpoint files. Whenever an standard output notification and a checkpoint notification are triggered for HDF5Writer for the same timestep, only the checkpoint will be written.
All wiki entries describe the dev branch. Features may be different in the current master branch.
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