EarthSciIntegrator

EarthSciIntegrator is a time integrator for the full 3-D .esm models of the EarthSciML stack. A run configuration says which operators make up a model’s right-hand side, which method integrates each one, how the operators are split, and what to differentiate; a planner turns that and an .esm document into a plan; and a library runs the plan forward and backward. It supports explicit, implicit, IMEX and split-explicit schemes, nested nonlinear solves, per-locality partitioning, and discrete adjoints of whole simulations.

There is one specification, implemented natively in Julia and in Rust, and the two are checked against each other by a shared conformance suite.

• Getting started : build a run from a run configuration, integrate it, differentiate it and replay it, in both languages.
• API reference : the Julia and Rust APIs side by side.
• Specification : what an implementation must do: the run configuration, the planner, methods and controllers, the operator interface, the tape, and the discrete adjoint.
• Architecture and decisions : the design and the reasons for it. The survey records the requirements it rests on, and the RFCs the changes it needs in sibling repositories.

The status of the implementation is in the specification index : the Julia and Rust implementations cover the M1 methods and the first stage of the planner.