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NOTE: MAESTRO is no longer being actively developed. Users should switch to MAESTROeX to take advantage of the latest capabilities:

a low Mach number stellar hydrodynamics code

Maestro solves the equations of low Mach number hydrodynamics for stratified atmospheres/stars with a general equation of state. It includes reactions and thermal diffusion and can be used on anything from a single core to 100,000s of processor cores with MPI + OpenMP.

A description of the algorithm and links to the algorithm papers can be found here:

Getting Started

To use Maestro you need a copy of the FBoxLib library, available on github at:

To use anything other than the simple microphysics, you need the StarKiller microphysics package, available on github at:

There are a few environment variables that need to be set. A Getting Started guide is provided in the Maestro User's Guide which will walk you through this. To build the User's Guide, cd into Docs/, and type make, or download the PDF here:

Call Graph

A doxygen-generated call graph is available here:

Development Model

Development generally follows the following ideas:

  • New features are committed to the development branch.

    Nightly regression testing is used to ensure that no answers change (or if they do, that the changes were expected).

    If a change is critical, we can cherry-pick the commit from development to master.

  • Contributions are welcomed from anyone. Any contributions that have the potential to change answers should be done via pull requests. A pull request should be generated from your fork of Maestro and target the development branch. (If you mistakenly target master, we can change it for you.)

    Please add a line to CHANGES summarizing your change if it is a bug fix or new feature. Reference the PR or issue as appropriate

    If there are a number of small commits making up the PR, we may wish to squash commits upon merge to have a clean history. Please ensure that your PR title and first post are descriptive, since these will be used for a squashed commit message.

  • On the first workday of each month, we perform a merge of development into master, in coordination with AMReX and FBoxLib, Maestro, and Microphysics. For this merge to take place, we need to be passing the regression tests.

    To accommodate this need, we close the merge window into development a few days before the merge day. While the merge window is closed, only bug fixes should be pushed into development. Once the merge from development -> master is done, the merge window reopens.

Core Developers

People who make a number of substantive contributions will be named "core developers" of Maestro. The criteria for becoming a core developer are flexible, but generally involve one of the following:

  • 10 non-merge commits to MAESTRO/Source/ or MAESTRO/Docs/ or one of the problems that is not your own science problem or

  • addition of a new algorithm / module or

  • substantial input into the code design process or testing

Core developers will be recognized in the following ways:

  • invited to the group's slack team

  • listed in the User's Guide and website as a core developer

  • invited to co-author general code papers / proceedings describing Maestro, its performance, etc. (Note: science papers will always be left to the science leads to determine authorship).

If a core developer is inactive for 3 years, we may reassess their status as a core developer.

Mailing list:

You can subscribe to the maestro-help mailing list at google groups at:!forum/maestro-help