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Getting Started
~~~~~~~~~~~~~~~
Obtaining **µSpectre**
**********************
**µSpectre** is hosted on a git repository on `c4science`_. To clone it, run
.. code-block:: sh
$ git clone https://c4science.ch/source/muSpectre.git
or if you prefer identifying yourself using a public ssh-key, run
.. code-block:: bash
$ git clone ssh://git@c4science.ch/source/muSpectre.git
The latter option requires you to have a user account on c4science (`create <https://c4science.ch/auth/start/>`_).
.. _c4science: https://c4science.ch
Building **µSpectre**
*********************
You can compile **µSpectre** using `CMake <https://cmake.org/>`_. The current (and possibly incomplete list of) dependencies are
- `Boost unit test framework <http://www.boost.org/doc/libs/1_66_0/libs/test/doc/html/index.html>`_
- `FFTW <http://www.fftw.org>`_
- `Sphinx <http://www.sphinx-doc.org>`_ and `Breathe <https://breathe.readthedocs.io>`_
**µSpectre** requires a relatively modern compiler as it makes heavy use of C++14 features. It has successfully been compiled and tested using the following compilers
- gcc-7.2
- gcc-6.4
- clang-5.0
- clang-4.0
It does *not* compile on Intel's most recent compiler, as it is still lacking some C++14 support. Work-arounds are planned, but will have to wait for someone to pick up the `task <https://c4science.ch/T1852>`_.
To compile, create a build folder and configure the CMake project. If you do this in the folder you cloned in the previous step, it can look for instance like this:
.. code-block:: sh
$ mkdir build-release
$ cd build-release
$ ccmake ..
Then, set the build type to ``Release`` to produce optimised code. µSpectre makes heavy use of expression templates, so optimisation is paramount. (As an example, the performance difference between code compiled in ``Debug`` and ``Release`` is about a factor 40 in simple linear elasticity.)
Finally, compile the library and the tests by running
.. code-block:: sh
$ make -j <NB-OF-PROCESSES>
.. warning::
When using the ``-j`` option to compile, be aware that compiling µSpectre uses quite a bit of RAM. If your machine start swapping at compile time, reduce the number of parallel compilations
Running **µSpectre**
********************
The easiest and intended way of using **µSpectre** is through its Python bindings. The following simple example computes the response of a two-dimensional stretched periodic RVE cell. The cell consist of a soft matrix with a circular hard inclusion.
.. literalinclude:: ../../../bin/tutorial_example.py
:language: python
More examples both both python and c++ executables can be found in the ``/bin`` folder.
Getting help
************
µSpectre is in a very early stage of development and the documentation is currently spotty. Also, there is no FAQ page yet. If you run into trouble, please contact us on the `µSpectre chat room <https://c4science.ch/Z69>`_ and someone will answer as soon as possible. You can also check the API :ref:`reference`.
Reporting Bugs
**************
If you think you found a bug, you are probably right. Please report it! The preferred way is for you to create a task on `µSpectre's workboard <https://c4science.ch/project/board/1447/>`_ and assign it to user ``junge``. Include steps to reproduce the bug if possible. Someone will answer as soon as possible.
Contribute
**********
We welcome contributions both for new features and bug fixes. New features must be documented and have unit tests. Please submit contributions for review as `Arcanist revisions <https://secure.phabricator.com/book/phabricator/article/arcanist/>`_. More detailed guidelines for submissions will follow soonᵀᴹ.
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