🌶️ chili

A modular, reusable, general-purpose backend

The chili backend acts in two phases. In the first phase, source code is being generated by macros and generics. Afterwards, the generated code is compiled and run. To leverage the strong type-system and compiler optimizations of the Rust compiler rustc, cellular_raza makes extensive use of these methods.

Code generation

cellular_raza provides generic concepts which need to be numerically integrated.

The chili backend makes extensive use of macros in order to build a fully working simulation. Three macros stand out in particular: build_aux_storage build_communicator and run_main. They can also be used in tandem via the run_simulation macro.

Aux Storage

To store additional information for cell-agents such as position, velocity increments used by the solver or information about next update steps of the cycle trait, we need an additional struct that holds this information. The chili backend provides the build_aux_storage macro which inserts code that defines said struct depending on which concepts the user chose.

Communicator

The [chili]((/internals/backend/chili) backend uses parallelization across multiple threads. Since cellular_raza makes use of domain decomposition methods, we must be able to communicate and synchronize between threads. The build_communicator macro inserts code which defines a new struct that fulfills this purpose.

Main function

To numerically solve the specified system, chili provides the run_main macro. It decomposes the domain with the cells and distributes the workload across multiple threads. The main purpose of this macro is to insert only update functions which correspond to the selected simulation aspects. It also handles storage of simulation results.