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<p align="center">
<a href="http://mfem.org/"><img alt="mfem" src="http://mfem.org/img/logo-300.png"></a>
</p>
<p align="center">
<a href="https://github.com/mfem/mfem/blob/master/LICENSE"><img alt="License" src="https://img.shields.io/badge/License-BSD-brightgreen.svg"></a>
<a href="https://travis-ci.org/mfem/mfem"><img alt="Build Status" src="https://travis-ci.org/mfem/mfem.svg?branch=master"></a>
<a href="https://ci.appveyor.com/project/mfem/mfem"><img alt="Build Status" src="https://ci.appveyor.com/api/projects/status/19non9sqm6msi2wy?svg=true"></a>
<a href="http://mfem.github.io/doxygen/html/index.html"><img alt="Doxygen" src="https://img.shields.io/badge/code-documented-brightgreen.svg"></a>
</p>
# How to Contribute
The MFEM team welcomes contributions at all levels: bugfixes; code improvements;
simplifications; new mesh, discretization or solver capabilities; improved
documentation; new examples and miniapps; HPC performance improvements; etc.
MFEM is distributed under the terms of the BSD-3 license. All new contributions
must be made under this license.
If you plan on contributing to MFEM, consider reviewing the
[issue tracker](https://github.com/mfem/mfem/issues) first to check if a thread
already exists for your desired feature or the bug you ran into. Use a pull
request (PR) toward the `mfem:master` branch to propose your contribution. If
you are planning significant code changes or have questions, you may want to
open an [issue](https://github.com/mfem/mfem/issues) before issuing a PR. In
addition to technical contributions, we are also interested in your results and
[simulation images](http://mfem.org/gallery/), which you can share via a pull
request in the [mfem/web](https://github.com/mfem/web) repo.
See the [Quick Summary](#quick-summary) section for the main highlights of our
GitHub workflow. For more details, consult the following sections and refer
back to them before issuing pull requests:
- [Quick Summary](#quick-summary)
- [Code Overview](#code-overview)
- [GitHub Workflow](#github-workflow)
- [MFEM Organization](#mfem-organization)
- [New Feature Development](#new-feature-development)
- [Developer Guidelines](#developer-guidelines)
- [Pull Requests](#pull-requests)
- [Pull Request Checklist](#pull-request-checklist)
- [Master/Next Workflow](#masternext-workflow)
- [Releases](#releases)
- [Release Checklist](#release-checklist)
- [LLNL Workflow](#llnl-workflow)
- [Automated Testing](#automated-testing)
- [Contact Information](#contact-information)
Contributing to MFEM requires knowledge of Git and, likely, finite elements. If
you are new to Git, see the [GitHub learning
resources](https://help.github.com/articles/git-and-github-learning-resources/).
To learn more about the finite element method, see our [FEM page](http://mfem.org/fem).
*By submitting a pull request, you are affirming the [Developer's Certificate of
Origin](#developers-certificate-of-origin-11) at the end of this file.*
## Quick Summary
- We encourage you to [join the MFEM organization](#mfem-organization) and create
development branches off `mfem:master`.
- Please follow the [developer guidelines](#developer-guidelines), in particular
with regards to documentation and code styling.
- Pull requests should be issued toward `mfem:master`. Make sure
to check the items off the [Pull Request Checklist](#pull-request-checklist).
- When your contribution is fully working and ready to be reviewed, add
the `ready-for-review` label.
- PRs are treated similarly to journal submission with an "editor" assigning two
reviewers to evaluate the changes.
- The reviewers have 3 weeks to evaluate the PR and work with the author to
fix issues and implement improvements.
- After approval, MFEM developers merge the PR manually in the [mfem:next branch](#masternext-workflow).
- After a week of testing in `mfem:next`, the original PR is merged in `mfem:master`.
- We use [milestones](https://github.com/mfem/mfem/milestones) to coordinate the
work on different PRs toward a release.
- Don't hesitate to [contact us](#contact-information) if you have any questions.
### Code Overview
#### Source code structure:
The MFEM library uses object-oriented design principles which reflect, in code,
the independent mathematical concepts of meshing, linear algebra and finite
element spaces and operators.
The MFEM source code has the following structure:
```
.
├── config
│ └── cmake
│ └── modules
├── data
├── doc
│ └── web
│ └── examples
├── examples
│ ├── ginkgo
│ ├── hiop
│ ├── petsc
│ ├── pumi
│ └── sundials
├── fem
│ └── libceed
├── general
├── linalg
├── mesh
├── miniapps
│ ├── common
│ ├── electromagnetics
│ ├── gslib
│ ├── meshing
│ ├── nurbs
│ ├── performance
│ ├── tools
│ └── toys
└── tests
├── scripts
├── unit
│ ├── ...
└── ...
```
#### Main directories and classes
The main directories are `fem/`, `mesh/` and `linalg/` containing the C++
classes implementing the finite element, mesh and linear algebra concepts
respectively.
- The main mesh classes are:
+ [`Mesh`](http://mfem.github.io/doxygen/html/classmfem_1_1Mesh.html)
+ [`NCMesh`](http://mfem.github.io/doxygen/html/classmfem_1_1NCMesh.html)
+ [`Element`](http://mfem.github.io/doxygen/html/classmfem_1_1Element.html)
+ [`ElementTransformation`](http://mfem.github.io/doxygen/html/classmfem_1_1ElementTransformation.html)
- The main finite element classes are:
+ [`FiniteElement`](http://mfem.github.io/doxygen/html/classmfem_1_1FiniteElement.html)
+ [`FiniteElementCollection`](http://mfem.github.io/doxygen/html/classmfem_1_1FiniteElement.html)
+ [`FiniteElementSpace`](http://mfem.github.io/doxygen/html/classmfem_1_1FiniteElementSpace.html)
+ [`GridFunction`](http://mfem.github.io/doxygen/html/classmfem_1_1GridFunction.html)
+ [`BilinearFormIntegrator`](http://mfem.github.io/doxygen/html/classmfem_1_1BilinearFormIntegrator.html) and [`LinearFormIntegrator`](http://mfem.github.io/doxygen/html/classmfem_1_1LinearFormIntegrator.html)
+ [`LinearForm`](http://mfem.github.io/doxygen/html/classmfem_1_1LinearFormIntegrator.html), [`BilinearForm`](http://mfem.github.io/doxygen/html/classmfem_1_1BilinearForm.html) and [`MixedBilinearForm`](http://mfem.github.io/doxygen/html/classmfem_1_1MixedBilinearForm.html)
- The main linear algebra classes and sources are
+ [`Operator`](http://mfem.github.io/doxygen/html/classmfem_1_1Operator.html) and [`BilinearForm`](http://mfem.github.io/doxygen/html/classmfem_1_1BilinearForm.html)
+ [`Vector`](http://mfem.github.io/doxygen/html/classmfem_1_1BilinearForm.html) and [`LinearForm`](http://mfem.github.io/doxygen/html/classmfem_1_1LinearForm.html)
+ [`DenseMatrix`](http://mfem.github.io/doxygen/html/classmfem_1_1DenseMatrix.html) and [`SparseMatrix`](http://mfem.github.io/doxygen/html/classmfem_1_1SparseMatrix.html)
+ Sparse [smoothers](http://mfem.github.io/doxygen/html/sparsesmoothers_8hpp.html) and linear [solvers](http://mfem.github.io/doxygen/html/solvers_8hpp.html)
#### Parallel implementation
Parallel MPI objects in MFEM inherit their serial counterparts, so a parallel
mesh for example is just a serial mesh on each task plus the information on
shared geometric entities between different tasks. The parallel source files
have a `p` prefix, e.g. `pmesh.cpp` vs. the serial `mesh.cpp`.
- The main parallel classes are
+ [`ParMesh`](http://mfem.github.io/doxygen/html/solvers_8hpp.html)
+ [`ParNCMesh`](http://mfem.github.io/doxygen/html/classmfem_1_1ParMesh.html)
+ [`ParFiniteElementSpace`](http://mfem.github.io/doxygen/html/classmfem_1_1ParFiniteElementSpace.html)
+ [`ParGridFunction`](http://mfem.github.io/doxygen/html/classmfem_1_1ParGridFunction.html)
+ [`ParBilinearForm`](http://mfem.github.io/doxygen/html/classmfem_1_1ParBilinearForm.html) and [`ParLinearForm`](http://mfem.github.io/doxygen/html/classmfem_1_1ParLinearForm.html)
+ [`HypreParMatrix`](http://mfem.github.io/doxygen/html/classmfem_1_1HypreParMatrix.html) and [`HypreParVector`](http://mfem.github.io/doxygen/html/classmfem_1_1HypreParVector.html)
+ [`HypreSolver`](http://mfem.github.io/doxygen/html/classmfem_1_1HypreSolver.html) and other [hypre classes](http://mfem.github.io/doxygen/html/hypre_8hpp.html)
#### GPU and general device support
GPU and multi-core CPU support is based on device kernels supporting different
backends (CUDA, OCCA, RAJA, OpenMP, etc.) and an internal lightweight
device/host memory manager.
- The main device-relevant classes and sources are:
+ [`Device`](http://mfem.github.io/doxygen/html/device_8hpp.html)
+ [`MemoryManager`](http://mfem.github.io/doxygen/html/mem_manager_8hpp.html)
+ the [`MFEM_FORALL`](http://mfem.github.io/doxygen/html/forall_8hpp.html) macro
+ the [`cuda.hpp`](http://mfem.github.io/doxygen/html/cuda_8hpp.html) and [`occa.hpp`](http://mfem.github.io/doxygen/html/occa_8hpp.html) files
#### Utilities, building and documentation
- The `general/` directory contains C++ classes that serve as utilities for
communication, error handling, arrays, (Boolean) tables, timing, etc.
- The `config/` directory contains build-related files, both for the plain
Makefile and the CMake build options.
- The `doc/` directory contains configuration for the Doxygen code documentation
that can either be built locally or browsed online at
http://mfem.github.io/doxygen/html/index.html.
#### Examples and tests
- `examples` and `miniapps` respectively gather simple and more fully-featured
demonstrations of the usage on MFEM. They both rely on `data/` for the
collection of meshes.
- The `tests/` directory contains a unit test suite and will later contain more
tests that run example codes.
See also the [code overview](http://mfem.org/code-overview/) section on the MFEM
website.
## GitHub Workflow
The MFEM GitHub organization: https://github.com/mfem, is the main developer hub
for the MFEM project.
If you plan to make contributions or would like to stay up-to-date with changes
in the code, *we strongly encourage you to [join the MFEM organization](#mfem-organization)*.
This will simplify the workflow (by providing you additional permissions), and
will allow us to reach you directly with project announcements.
### MFEM Organization
#### Getting started (GitHub)
Before you can start, you need a GitHub account, here are a few suggestions:
+ Create the account at: [github.com/join](https://github.com/join).
+ For easy identification, please add your full name and maybe a picture of you at:
https://github.com/settings/profile.
+ To receive notification, set a primary email at: https://github.com/settings/emails.
+ For password-less pull/push over SSH, add your SSH keys at: https://github.com/settings/keys.
#### Joining
- [Contact us](#contact-information) for an invitation to join the MFEM GitHub
organization. You will receive an invitation email, which you can directly accept.
Alternatively, *after logging into GitHub*, you can accept the invitation at
the top of https://github.com/mfem.
- Consider making your membership public by going to https://github.com/orgs/mfem/people
and clicking on the organization visibility drop box next to your name.
- Project discussions and announcements will be posted at
https://github.com/orgs/mfem/teams/everyone.
#### Structure
- The MFEM source code is in the [mfem](https://github.com/mfem/mfem)
repository.
- The website and corresponding documentation are in the
[web](https://github.com/mfem/web) repository.
- The [PyMFEM](https://github.com/mfem/PyMFEM) repository contains a Python
wrapper for MFEM.
- The [data](https://github.com/mfem/data) repository contains additional
(large) datafiles for MFEM.
### New Feature Development
- A new feature should be important enough that at least one person, the
author, is willing to work on it and be its champion.
- The author creates a branch for the new feature (with suffix `-dev`), off
the `master` branch, or another existing feature branch, for example:
```
# Clone assuming you have setup your ssh keys on GitHub:
git clone git@github.com:mfem/mfem.git
# Alternatively, clone using the "https" protocol:
git clone https://github.com/mfem/mfem.git
# Create a new feature branch starting from "master":
git checkout master
git pull
git checkout -b feature-dev
# Work on "feature-dev", add local commits
# ...
# (One time only) push the branch to github and setup your local
# branch to track the github branch (for "git pull"):
git push -u origin feature-dev
```
- **We prefer that you create the new feature branch inside the MFEM organization
as opposed to in a fork.** This allows everyone in the community to collaborate
in one central place.
- If you prefer to work in your fork, please [enable upstream edits](https://help.github.com/articles/allowing-changes-to-a-pull-request-branch-created-from-a-fork/).
- Never use the `next` branch to start a new feature branch!
- The typical feature branch name is `new-feature-dev`, e.g. `pumi-dev`. While
not frequent in MFEM, other suffixes are possible, e.g. `-fix`, `-doc`, etc.
### Developer Guidelines
- *Keep the code lean and as simple as possible*
- Well-designed simple code is frequently more general and powerful.
- Lean code base is easier to understand by new collaborators.
- New features should be added only if they are necessary or generally useful.
- Introduction of language constructions not currently used in MFEM should be
justified and generally avoided (to maintain portability to various systems
and compilers, including early access hardware).
- We prefer basic C++ and the C++03 standard, to keep the code readable by
a large audience and to make sure it compiles anywhere.
- *Keep the code general and reasonably efficient*
- The main goal is fast prototyping for research and application development.
- When in doubt, generality wins over efficiency.
- Respect the needs of different users (current and/or future).
- *Keep things separate and logically organized*
- General usage features go in MFEM (implemented in as much generality as
possible), non-general features go into external apps.
- Inside MFEM, compartmentalize between linalg, fem, mesh, GLVis, etc.
- Contributions that are project-specific or have external dependencies are
allowed (if they are of broader interest), but should be `#ifdef`-ed and not
change the code by default.
- Code specifics
- All significant new classes, methods and functions have Doxygen-style
documentation in source comments.
- Consistent code styling is enforced with `make style` in the top-level
directory. This requires [Artistic Style](http://astyle.sourceforge.net) (we
specifically use version 2.05.1). See also the file `config/mfem.astylerc`.
- Use `mfem::out` and `mfem::err` instead of `std::cout` and `std::cerr` in
internal library code. (You can use `std` in examples and miniapps.)
- When manually resolving conflicts during a merge, make sure to mention the
conflicted files in the commit message.
### Pull Requests
- When your branch is ready for other developers to review / comment on
the code, create a pull request towards `mfem:master`.
- Pull request typically have titles like:
`Description [new-feature-dev]`
for example:
`Parallel Unstructured Mesh Infrastructure (PUMI) integration [pumi-dev]`
Note the branch name suffix (in square brackets).
- Titles may contain a prefix in square brackets to emphasize the type of PR.
Common choices are: `[DON'T MERGE]`, `[WIP]` and `[DISCUSS]`, for example:
`[DISCUSS] Hybridized DG [hdg-dev]`
- If the PR is still a work in progress, add the `WIP` label to it and
optionally the `[WIP]` prefix in the title.
- Add a description, appropriate labels and assign yourself to the PR. The MFEM
team will add reviewers as appropriate.
- List outstanding TODO items in the description, see PR #222 for an example.
- When your contribution is fully working and ready to be reviewed, add
the `ready-for-review` label.
- PRs are treated similarly to journal submission with an "editor" assigning
two reviewers to evaluate the changes. The reviewers have 3 weeks to evaluate
the PR and work with the author to implement improvements and fix issues.
- After approval, the PR is [tested](#masternext-workflow) for a week with
other approved PRs in the `mfem:next` branch.
- Consider manually running the tests in `tests/scripts` before merging in
`mfem:next`, see the [README](tests/scripts/README) file in that directory
for more details.
- Track the Travis CI and Appveyor [continuous integration](#automated-testing)
builds at the end of the PR. These should generally run clean, so address any
errors as soon as possible. Please ask if you are unsure how to do that.
- Note that some tests, such as the `branch-history` check in Travis are
safeguards that are allowed to fail in certain cases.
- Other tests, such as the `code-style`, `documentation` and `gitignore`
checks in Travis enforce MFEM-specific rules which are explained in the
error messages and the `tests/scripts` directory.
- If triggered, track the status of the LLNL GitLab tests. If failing, ask
one of the _LLNL developers_ for details.
### Pull Request Checklist
Before a PR can be merged, it should satisfy the following:
- [ ] Code builds.
- [ ] Code passes `make style`.
- [ ] Update `CHANGELOG`:
- [ ] Is this a new feature users need to be aware of? New or updated example or miniapp?
- [ ] Does it make sense to create a new section in the `CHANGELOG` to group with other related features?
- [ ] Update `INSTALL`:
- [ ] Had a new optional library been added? If so, what range of versions of this library are required? (*Make sure the external library is compatible with our BSD license, e.g. it is not licensed under GPL!*)
- [ ] Have the version ranges for any required or optional libraries changed?
- [ ] Does `make` or `cmake` have a new target?
- [ ] Did the requirements or the installation process change? *(rare)*
- [ ] Update continuous integration server configurations if necessary (e.g. with new version requirements for each of MFEM's dependencies)
- [ ] `.travis.yml`
- [ ] `.appveyor.yml`
- [ ] Update `.gitignore`:
- [ ] Check if `make distclean; git status` shows any files that were generated from the source by the project (not an IDE) but we don't want to track in the repository.
- [ ] Add new patterns (just for the new files above) and re-run the above test.
- [ ] New examples:
- [ ] All sample runs at the top of the example source file work.
- [ ] Update `examples/makefile`:
- [ ] Add the example code to the appropriate `SEQ_EXAMPLES` and `PAR_EXAMPLES` variables.
- [ ] Add any files generated by it to the `clean` target.
- [ ] Add the example binary and any files generated by it to the top-level `.gitignore` file.
- [ ] Update `examples/CMakeLists.txt`:
- [ ] Add the example code to the `ALL_EXE_SRCS` variable.
- [ ] Make sure `THIS_TEST_OPTIONS` is set correctly for the new example.
- [ ] List the new example in `doc/CodeDocumentation.dox`.
- [ ] If new examples directory (e.g.`examples/pumi`), list it in `doc/CodeDocumentation.conf.in`
- [ ] Companion pull request for documentation in [mfem/web](https://github.com/mfem/web) repo:
- [ ] Update or add example-specific documentation, see e.g. the `src/examples.md`.
- [ ] Add the description, labels and screenshots in `src/examples.md` and `src/img`.
- [ ] In `examples.md`, list the example under the appropriate categories, add new categories if necessary.
- [ ] Add a short description of the example in the "Extensive Examples" section of `features.md`.
- [ ] New miniapps:
- [ ] All sample runs at the top of the miniapp source file work.
- [ ] Update top-level `makefile` and `makefile` in corresponding miniapp directory.
- [ ] Add the miniapp binary and any files generated by it to the top-level `.gitignore` file.
- [ ] Update CMake build system:
- [ ] Update the `CMakeLists.txt` file in the `miniapps` directory, if the new miniapp is in a new directory.
- [ ] Add/update the `CMakeLists.txt` file in the new miniapp directory.
- [ ] Consider adding a new test for the new miniapp.
- [ ] List the new miniapp in `doc/CodeDocumentation.dox`
- [ ] If new miniapps directory (e.g.`miniapps/nurbs`), list it in `doc/CodeDocumentation.conf.in`
- [ ] Companion pull request for documentation in [mfem/web](https://github.com/mfem/web) repo:
- [ ] Update or add miniapp-specific documentation, see e.g. the `src/meshing.md` and `src/electromagnetics.md` files.
- [ ] Add the description, labels and screenshots in `src/examples.md` and `src/img`.
- [ ] The miniapps go at the end of the page, and are usually listed only under a specific "Application (PDE)" category.
- [ ] Add a short description of the miniapp in the "Extensive Examples" section of `features.md`.
- [ ] New capability:
- [ ] All significant new classes, methods and functions have Doxygen-style documentation in source comments.
- [ ] Consider adding new sample runs in existing examples to highlight the new capability.
- [ ] Consider saving cool simulation pictures with the new capability in the Confluence gallery (LLNL only) or submitting them, via pull request, to the gallery section of the `mfem/web` repo.
- [ ] If this is a major new feature, consider mentioning it in the short summary inside `README` *(rare)*.
- [ ] List major new classes in `doc/CodeDocumentation.dox` *(rare)*.
- [ ] Update this checklist, if the new pull request affects it.
- [ ] Run `make unittest` to make sure all unit tests pass.
- [ ] Run the tests in `tests/scripts`.
- [ ] (LLNL only) After merging:
- [ ] Regenerate `README.html` files from companion documentation pull requests.
- [ ] Update internal tests to include the new features.
### Master/Next Workflow
MFEM uses a `master`/`next`-branch workflow as described below:
- The `master` branch should always be of release quality and changes should not
be merged until they have been fully tested. This branch is protected, and
changes can only be made through pull requests.
- After approval, a pull request is merged manually (by MFEM developers) in the
`next` branch for testing and the `in-next` label is added to the PR.
This can be done as follows:
```
# Pull the latest version of the "feature-dev" branch
git checkout feature-dev
git pull
# Pull the latest version of the "next" branch
git checkout next
git pull
# Merge "feature-dev" into "next", resolving conflicts, if necessary.
# Use the "--no-ff" flag to create a new commit with merge message.
git merge --no-ff feature-dev
# Push the "next" branch to the server
git push
```
- After a week of testing in `next` (excluding bugfixes), both on GitHub, as
well as [internally](#tests-at-llnl) at LLNL, the original PR is merged into
`master` (provided there are no issues).
- After the merge, the feature branch is deleted (unless it is a long-term
project with periodic PRs).
- The `next` branch is used just for integrated testing of all PRs approved for
merging into `master` to verify that each works individually and that all of
them work as a group. This branch can be discarded at any time, though we
typically do that only at the end of a [release cycle](#releases).
### Releases
- Releases are just tags in the `master` branch, e.g. https://github.com/mfem/mfem/releases/tag/v3.3.2,
and have a version that ends in an even "patch" number, e.g. `v3.2.2` or
`v3.4` (by convention `v3.4` is the same as `v3.4.0`.) Between releases, the
version ends in an odd "patch" number, e.g. `v3.3.3`.
- We use [milestones](https://github.com/mfem/mfem/milestones) to coordinate the
work on different PRs toward a release, see for example the
[v3.3.2 release](https://github.com/mfem/mfem/milestone/1?closed=1).
- After a release is complete, the `next` branch is recreated, e.g. as follows
(replace `3.3.2` with current release):
- Rename the current `next` branch to `next-pre-v3.3.2`.
- Create a new `next` branch starting from the `v3.3.2` release.
- Local copies of `next` can then be updated with `git fetch origin next && git checkout -B next origin/next`.
### Release Checklist
- [ ] Update the MFEM version in the following files:
- [ ] `CHANGELOG`
- [ ] `makefile`
- [ ] `CMakeLists.txt`
- [ ] `doc/CodeDocumentation.conf.in`
- [ ] Check that version requirements for each of MFEM's dependencies are documented in `INSTALL` and up-to-date
- [ ] Check that continuous integration server configurations reflect the dependency version requirements of the new release
- [ ] `.travis.yml`
- [ ] `.appveyor.yml`
- [ ] (LLNL only) Make sure all `README.html` files in the source repo are up to date.
- [ ] Tag the repository:
```
git tag -a v3.1 -m "Official release v3.1"
git push origin v3.1
```
- [ ] Create the release tarball and push to `mfem/releases`.
- [ ] Recreate the `next` branch as described in previous section.
- [ ] Update and push documentation to `mfem/doxygen`.
- [ ] Update URL shortlinks:
- [ ] Create a shortlink at [http://bit.ly/](http://bit.ly/) for the release tarball, e.g. http://mfem.github.io/releases/mfem-3.1.tgz.
- [ ] (LLNL only) Add and commit the new shortlink in the `links` and `links-mfem` files of the internal `mfem/downloads` repo.
- [ ] Add the new shortlinks to the MFEM packages in `spack`, `homebrew/science`, `VisIt`, etc.
- [ ] Update website in `mfem/web` repo:
- Update version and shortlinks in `src/index.md` and `src/download.md`.
- Use [cloc-1.62.pl](http://cloc.sourceforge.net/) and `ls -lh` to estimate the SLOC and the tarball size in `src/download.md`.
## LLNL Workflow
### Mirroring on Bitbucket
- The GitHub `master` and `next` branches are mirrored to the LLNL institutional
Bitbucket repository as `gh-master` and `gh-next`.
- `gh-master` is merged into LLNL's internal `master` through pull requests; write
permissions to `master` are restricted to ensure this is the only way in which it
gets updated.
- We never push directly from LLNL to GitHub.
- Versions of the code on LLNL's internal server, from most to least stable:
- MFEM official release on mfem.org -- Most stable, tested in many apps.
- `mfem:master` -- Recent development version, guaranteed to work.
- `mfem:gh-master` -- Stable development version, passed testing, you can use
it to build your code between releases.
- `mfem:gh-next` -- Bleeding-edge development version, may be broken, use at
your own risk.
### Mirroring on GitLab
- MFEM repository is also mirrored on the LLNL GitLab instance, in a
semi-automated manner.
- This instance is meant to complete CI testing with tests on Livermore
Computing systems. Gitlab pipeline status is reported in the corresponding
GitHub pull request.
- No change can be made on this instance.
## Automated Testing
MFEM has several levels of automated testing running on GitHub, as well as on
local Mac and Linux workstations, and Livermore Computing clusters at LLNL.
### Linux and Mac smoke tests
We use Travis CI to drive the default tests on the `master` and `next`
branches. See the `.travis` file and the logs at
[https://travis-ci.org/mfem/mfem](https://travis-ci.org/mfem/mfem).
Testing using Travis CI should be kept lightweight, as there is a 50 minute time
constraint on jobs. Two virtual machines are configured - Mac (OS X) and Linux.
- Tests on the `master` branch are triggered whenever a PR is issued on this branch.
- Tests on the `next` branch are currently scheduled to run each night.
### Windows smoke test
We use Appveyor to test building with the MS Visual C++ compiler in a Windows
environment, as well as to test the CMake build. See the `.appveyor` file and the
build logs at
[https://ci.appveyor.com/project/mfem/mfem](https://ci.appveyor.com/project/mfem/mfem).
CMake is used to generate the MSVC Project files and drive the build. A release
and debug build is performed with a simple run of `ex1` to verify the executable.
### Tests at LLNL
- We mirror the `master` and `next` branches internally (to `gh-master` and
`gh-next`) and run longer nightly tests via cron. On the weekends, a more
extensive test is run which extracts and executes all the different sample
runs from each example.
- We also mirror PRs on the LLNL GitLab instance. PR mirroring can only be
triggered by _LLNL developers_, but test status is publicly available. Only
_LLNL developers_ can access the detailed test report.
## Contact Information
- Contact the MFEM team by posting to the [GitHub issue tracker](https://github.com/mfem/mfem).
Please perform a search to make sure your question has not been answered already.
- Email communications should be sent to the MFEM developers mailing list,
mfem-dev@llnl.gov.
## [Developer's Certificate of Origin 1.1](https://developercertificate.org/)
By making a contribution to this project, I certify that:
(a) The contribution was created in whole or in part by me and I have the right
to submit it under the open source license indicated in the file; or
(b) The contribution is based upon previous work that, to the best of my
knowledge, is covered under an appropriate open source license and I have
the right under that license to submit that work with modifications, whether
created in whole or in part by me, under the same open source license
(unless I am permitted to submit under a different license), as indicated in
the file; or
(c) The contribution was provided directly to me by some other person who
certified (a), (b) or (c) and I have not modified it.
(d) I understand and agree that this project and the contribution are public and
that a record of the contribution (including all personal information I
submit with it, including my sign-off) is maintained indefinitely and may be
redistributed consistent with this project or the open source license(s)
involved.
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