SUEWS

This is a public repo for SUEWS source code and documentation.

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• SUEWS
  • Documentation
  • Compilation
  • Sample Run
  • Developer Note
    • Branch
      • master branch
    • Manual
    • Test
      • Tests and purposes
      • Workflow
      • Preparation of tests
    • Debugging with GDB
      • GDB on macOS
      • debugging with GDB
    • Questions

Documentation

• Documentation site: https://suews.readthedocs.io/

• Documentation source: docs folder in this repo

Compilation

Prerequisites

Essential

• gfortran (>= 9.3.0)
• git - for version control
• mamba - avoid using conda as it is too slow

Recommended

• WSL - for Linux-like environment on Windows
• VS Code - for code editing
• VS Code Co-pilot - for AI-assisted code writing (free for academic use)

Compilation

1. Since SUEWS includes a dependency package SPARTACUS, one needs to initialise this submodule by:

git submodule init
git submodule update

Then source code of SPARTACUS will be loaded into SUEWS-SourceCode/ext_lib/spartacus-surface

Note: if a permission denied error occurs, one usually needs to fix the SSH connection to GitHub by following the official guide here.

2. Configure mamba environment by:

mamba env create -f env.yml

This will create a new environment named suews-dev with all the required packages installed.

3. Activate the environment by:

make activate suews-dev

4. Compile SUEWS

4.1 compile the code and perform all tests

make

4.2 only compile the code

make dev

This will install a python package supy-driver and supy into the current environment (i.e., suews-dev). Also, several command-line tools will be installed under bin folder, which can be used to perform SUEWS simulations:

• suews-run: the main SUEWS binary
• suews-convert: a tool to convert SUEWS input files from old format to new format the usage of both of which can be checked by --help option (e.g., suews-run --help).

5. Check if supy is installed by:

pip show supy

Developer Note

• When doing pip install -e supy-driver using WSL in VS Code on Windows 10 I got the error "[Errno 13] Permission denied: 'build/bdist.linux-x86_64/wheel/supy_driver-2021a2.dist-info'". The solution was in the Windows file explorer to right-click the project directory (SUEWS) -> properties -> security -> edit -> everyone -> tick allow -> apply.

Branch

master branch

master is the main branch that keeps milestone and stable features.

• push is restricted to admin members.

If one needs to fix a bug or implement a new feature, please open an issue with details and then submit a pull request with respect to that issue.

Documentation

• Please keep the development changes in CHANGELOG.md.

Test

Whenever changes are made, please run make test in the repo root to check if your changes are working or not. If any error, please resolve it or justify that the test is giving false alarm.

Tests and purposes

make test will perform the following checks:

• if single-grid-multi-year run could be successful: to check if multi-year run is functional;
• if multi-grid-multi-year run could be successful: to check if multi-grid run is functional;
• if test run results could match those from the standard run (runs under BaseRun): to check if any non-functional changes would break the current code;
• if all physics schemes are working: to check possible invalid physics schemes.

Debugging with GDB

GDB is a generic debugging tool used along with gfortran. Here are some tips to debug SUEWS code:

GDB on macOS

Recent macOS (since High Sierra) introduces extra security procedures for system level operations that makes installation GDB more tedious than before. The best practice, in TS's opinion, to avoid hacking your macOS, is to use Linux docker images with gfortran & gdb installations: e.g., alpine-gfortran (otherwise, this guide might be useful for installation of GDB on macOS; also run set startup-with-shell off inside GDB before run the debuggng process)

Once the docker image is installed, simply run this from the SUEWS root folder for debugging:

 docker run --rm -it -v $(pwd):/source sunt05/alpine-gfortran /bin/bash

which will mount the current SUEWS directory to docker's path /source and enter the interactive mode for debugging.

debugging with GDB

1. enable the debugging related flags in Makefile under SUEWS-SourceCode by removing the # after the equal sign =:

FCNOOPT = -O0
FFLAGS = -O3 $(STATIC) $(FCDEBUG) -Wall -Wtabs -fbounds-check -cpp \
					-Wno-unused-dummy-argument -Wno-unused-variable

2. fully clean and recompile SUEWS:

make clean; make

3. copy the recompiled SUEWS binary into your SUEWS testing folder (e.g., Test/BaseRun/2019a) and load it into GDB:

gdb SUEWS

run

then you should have stack info printed out by GDB if any runtime error occurs.

More detailed GDB tutorial can be found here.

Questions

• Please raise issues for questions in the development so our progress can be well managed.