Enable saving the entire simulation state to disk and restoring it again #757
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Suggestions for suitable storage formats are welcome. Note that according to the FMI spec, each subsimulator does its own serialisation and deserialisation, and all the co-simulator sees are binary blobs. So the format needs to support storage of arbitrary binary data. |
kyllingstad
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Jul 4, 2024
This is a follow-up to #765 and the final step to close #757. Here, I've implemented functionality to export the internal state of individual subsimulators in a generic, structured form, and to import them again later. This exported form is intended as an intermediate step before serialisation and disk storage. The idea was to create a type that can be inspected and serialised to almost any file format we'd like. The type is defined by `cosim::serialization::node` in `cosim/serialization.hpp`. It is a hierarchical, dynamic data type with support for a variety of primitive scalar types and a few aggregate types: strings, arrays of nodes, dictionaries of nodes, and binary blobs. (Think JSON, only with more types.)
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This feature is desired in the OptiStress project, where we will need to simulate the same system many times in a loop with parameter variations. It will save a lot of time since we can start each simulation from a “warmed up” state.
Depends on #756 and #768.
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