# cansud98/wrf-mcb architecture

> Architecture diagram of the GitHub repository cansud98/wrf-mcb, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-11-15). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/cansud98/wrf-mcb
- Repository: https://github.com/cansud98/wrf-mcb

## Overview

This repository is the WRF-ARW modeling system, identified by the README as WRF-Chem v4.3.3 with MCB included. The tree exposes supporting model infrastructure—chemical-mechanism generation, Registry-based code generation, parallel communication, and meteorological I/O—but not enough of the model runtime to trace a complete user-to-simulation-result workflow. The graph therefore shows these distinct capabilities and only relationships evidenced by the README or sampled/indexed source references; it does not infer runtime sequencing for unsampled components.

Main entry points: [`chem/KPP/kpp/kpp-2.1/src/gen.c`](https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/src/gen.c) (KPP generator), [`tools/gen_comms.c`](https://github.com/cansud98/wrf-mcb/blob/main/tools/gen_comms.c) (Communication generator), [`external/RSL_LITE/gen_comms.c`](https://github.com/cansud98/wrf-mcb/blob/main/external/RSL_LITE/gen_comms.c) (RSL communication generator), [`tools/registry.h`](https://github.com/cansud98/wrf-mcb/blob/main/tools/registry.h) (Registry definitions)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_chem["Chemistry tools"]
  node_kpp_main["KPP driver<br/>[main.c]"]
  node_kpp_solver["Rosenbrock solver<br/>[rosenbrock.c]"]
  node_kpp_codegen["KPP generator<br/>[gen.c]"]
  node_kpp_data["Generator data<br/>[gdata.h]"]
  node_kpp_code["Code interface<br/>[code.h]"]
  node_kpp_defs["Generator definitions<br/>[gdef.h]"]
end

subgraph group_registry["Registry generation"]
  node_registry_defs["Registry definitions<br/>[registry.h]"]
  node_registry_data["Registry data model<br/>[data.h]"]
  node_registry_protos["Generator interfaces<br/>[protos.h]"]
  node_registry_comms["Communication generator<br/>[gen_comms.c]"]
end

subgraph group_parallel["Parallel communication"]
  node_rsl_comms["RSL communication generator<br/>[gen_comms.c]"]
  node_rsl_runtime["RSL-LITE runtime<br/>[c_code.c]"]
end

subgraph group_io["Meteorological I/O"]
  node_grib1["GRIB1 routines<br/>[grib1_routines.c]"]
  node_gridnav["Grid navigation<br/>[gridnav.c]"]
  node_grib2_bacio["Byte-addressable I/O<br/>[bacio.v1.3.c]"]
  node_wrf_index[("Binary I/O index<br/>[io_int_idx.c]")]
end

node_wrf["WRF-Chem model"]

node_kpp_codegen -->|"uses definitions"| node_kpp_data
node_kpp_codegen -->|"uses interface"| node_kpp_code
node_kpp_codegen -->|"uses definitions"| node_kpp_defs
node_registry_comms -->|"uses data model"| node_registry_data
node_registry_comms -->|"uses definitions"| node_registry_defs
node_rsl_comms -->|"uses data model"| node_registry_data
node_rsl_comms -->|"uses definitions"| node_registry_defs
node_grib1 -->|"uses navigation"| node_gridnav

click node_kpp_main "https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/drv/main.c"
click node_kpp_solver "https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/int/rosenbrock.c"
click node_kpp_codegen "https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/src/gen.c"
click node_kpp_data "https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/src/gdata.h"
click node_kpp_code "https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/src/code.h"
click node_kpp_defs "https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/src/gdef.h"
click node_registry_defs "https://github.com/cansud98/wrf-mcb/blob/main/tools/registry.h"
click node_registry_data "https://github.com/cansud98/wrf-mcb/blob/main/tools/data.h"
click node_registry_protos "https://github.com/cansud98/wrf-mcb/blob/main/tools/protos.h"
click node_registry_comms "https://github.com/cansud98/wrf-mcb/blob/main/tools/gen_comms.c"
click node_rsl_comms "https://github.com/cansud98/wrf-mcb/blob/main/external/RSL_LITE/gen_comms.c"
click node_rsl_runtime "https://github.com/cansud98/wrf-mcb/blob/main/external/RSL_LITE/c_code.c"
click node_grib1 "https://github.com/cansud98/wrf-mcb/blob/main/external/io_grib1/grib1_routines.c"
click node_gridnav "https://github.com/cansud98/wrf-mcb/blob/main/external/io_grib_share/gridnav.c"
click node_grib2_bacio "https://github.com/cansud98/wrf-mcb/blob/main/external/io_grib2/bacio-1.3/bacio.v1.3.c"
click node_wrf_index "https://github.com/cansud98/wrf-mcb/blob/main/external/io_int/io_int_idx.c"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_kpp_main,node_kpp_solver,node_kpp_codegen,node_kpp_data,node_kpp_code,node_kpp_defs toneBlue
class node_registry_defs,node_registry_data,node_registry_protos,node_registry_comms toneAmber
class node_rsl_comms,node_rsl_runtime toneMint
class node_grib1,node_gridnav,node_grib2_bacio,node_wrf_index toneRose
class node_wrf toneIndigo
```

## Components

### Chemistry tools

- [KPP driver](https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/drv/main.c): `chem/KPP/kpp/kpp-2.1/drv/main.c`
- [Rosenbrock solver](https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/int/rosenbrock.c): `chem/KPP/kpp/kpp-2.1/int/rosenbrock.c`
- [KPP generator](https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/src/gen.c): `chem/KPP/kpp/kpp-2.1/src/gen.c`
- [Generator data](https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/src/gdata.h): `chem/KPP/kpp/kpp-2.1/src/gdata.h`
- [Code interface](https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/src/code.h): `chem/KPP/kpp/kpp-2.1/src/code.h`
- [Generator definitions](https://github.com/cansud98/wrf-mcb/blob/main/chem/KPP/kpp/kpp-2.1/src/gdef.h): `chem/KPP/kpp/kpp-2.1/src/gdef.h`

### Registry generation

- [Registry definitions](https://github.com/cansud98/wrf-mcb/blob/main/tools/registry.h): `tools/registry.h`
- [Registry data model](https://github.com/cansud98/wrf-mcb/blob/main/tools/data.h): `tools/data.h`
- [Generator interfaces](https://github.com/cansud98/wrf-mcb/blob/main/tools/protos.h): `tools/protos.h`
- [Communication generator](https://github.com/cansud98/wrf-mcb/blob/main/tools/gen_comms.c): `tools/gen_comms.c`

### Parallel communication

- [RSL communication generator](https://github.com/cansud98/wrf-mcb/blob/main/external/RSL_LITE/gen_comms.c): `external/RSL_LITE/gen_comms.c`
- [RSL-LITE runtime](https://github.com/cansud98/wrf-mcb/blob/main/external/RSL_LITE/c_code.c): `external/RSL_LITE/c_code.c`

### Meteorological I/O

- [GRIB1 routines](https://github.com/cansud98/wrf-mcb/blob/main/external/io_grib1/grib1_routines.c): `external/io_grib1/grib1_routines.c`
- [Grid navigation](https://github.com/cansud98/wrf-mcb/blob/main/external/io_grib_share/gridnav.c): `external/io_grib_share/gridnav.c`
- [Byte-addressable I/O](https://github.com/cansud98/wrf-mcb/blob/main/external/io_grib2/bacio-1.3/bacio.v1.3.c): `external/io_grib2/bacio-1.3/bacio.v1.3.c`
- [Binary I/O index](https://github.com/cansud98/wrf-mcb/blob/main/external/io_int/io_int_idx.c): `external/io_int/io_int_idx.c`

### Other components

- **WRF-Chem model**

## Connections

- KPP generator → Generator data: uses definitions (evidence: `chem/KPP/kpp/kpp-2.1/src/gen.c`)
- KPP generator → Code interface: uses interface (evidence: `chem/KPP/kpp/kpp-2.1/src/gen.c`)
- KPP generator → Generator definitions: uses definitions
- Communication generator → Registry data model: uses data model (evidence: `tools/gen_comms.c`)
- Communication generator → Registry definitions: uses definitions (evidence: `tools/gen_comms.c`)
- RSL communication generator → Registry data model: uses data model (evidence: `external/RSL_LITE/gen_comms.c`)
- RSL communication generator → Registry definitions: uses definitions (evidence: `external/RSL_LITE/gen_comms.c`)
- GRIB1 routines → Grid navigation: uses navigation (evidence: `external/io_grib1/grib1_routines.c`)