34. Serialized Restart Calculation¶
RMC supports using serialization functionality to implement restart calculations. This feature can be used to restart calculations after RMC has stopped computing.
34.1. Serialized Restart Calculation Module Input Options¶
SERIALIZE
RESTARTCRITICALITY Write =<flag> Cycles=<cycles_vector_group>
Among them,
- SERIALIZE is the keyword for the serialized restart calculation module;
- RESTARTCRITICALITY is the keyword for using serialized restart calculation in criticality calculations;
- Write specifies whether to output data files, 1 indicates output, 0 indicates no output, the default value is 0; When this option is 1,
- the input value in the Cycles input option must be defined.
- Cycles specifies the generations where all data is output in memory in binary format after the calculation is completed in criticality calculation mode;
For example, when performing a criticality calculation, add to the input card:
SERIALIZE
RESTARTCRITICALITY Write = 1 Cycles= 3 23 43
The program will output all data after the 3rd, 23rd, and 43rd generations of neutron simulation are completed.
The program will create a corresponding number of folders (3 in this example) in the directory where the input card file is located. The folder names will be “‘CriSerializeFiles’ + space + generation number”. Data saved after different generations will be stored in different folders. The data files in the folders are in binary format, with one data file corresponding to an object of a class. The file name is the object name in the program code. The data files saved in criticality calculations are listed in the table below. Data files for the same object after different generations have the same name and are distinguished only by the folder they are in.
| File Name | Description |
|---|---|
| cCalMode | Calculation mode |
| cFixedSource | Fixed source |
| cNeutronTransport | Neutron transport |
| cPhotonTransport | Photon transport |
| cElectronTransport | Electron transport |
| cAceData | ACE cross-section data |
| cCriticality | Criticality |
| cMaterial | Material |
| cGeometry | Geometry |
| cParticleState | Particle information |
| cConvergence | Convergence |
| cTally | Tally |
| cBurnup | Burnup |
| ORNG | Random number |
| cAdjoint | Adjoint |
| cSampling | Random sampling |
| OXSParaTableVec | Cross-section parameterization class |
| Output | Output class |
| cellVector | Class for fast hashing of cell expansion expressions |
| OParticleTracker | Class for unified control of particle event filtering and output in the program |
| OMeshInfo | Mesh information |
| OWeightWindow | Weight window class |
| OStatus | Class for recording RMC running status |
34.2. Data File Usage¶
To read in saved data files for continuation calculations, simply run the RMC program again. The program will automatically detect whether there are complete data files in the default save path, select and read the data with the most completed neutron generations to continue the subsequent calculations.
As seen in the previous example, if only the “CriSerializeFiles 3” and “CriSerializeFiles 23” folders exist and are complete, the program will read the files in “CriSerializeFiles 23” and start neutron generation simulation calculations directly from the 24th generation, and will still output all information after the 43rd generation.
Here, the data completeness means that the folder exists and contains files with corresponding file names, but the correctness of the information in the files is not checked. Hence, the user should not modify these automatically saved files to ensure the correctness of the restart calculation results.