A schematic view of zppy

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The above diagram shows the major components of the zppy workflow:

1. The config file. Users launch zppy with zppy -c config.cfg. Parameters are set based on a hierarchy: default.ini’s default parameter settings; the [default] section; the [[task]] section; the [[subtask]] section.

2. Jinja2 bash templates. Parameters from the cfg can be substituted in.

3. Insantiated bash scripts. By substituting the appropriate values from the cfg into the relevant bash template, zppy is able to create working bash scripts and then run them. For example, if a user wants to run 200 years of analysis in 20 year increments, they just need to specify 1:200:20 and zppy will know to launch 10 scripts to cover that time period.

4. Dependency awareness. zppy will know if a job can’t yet be launched. For more on this, see dependencies.

If users re-run zppy only previously failed or newly requested jobs will be launched.