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INSTALL.md

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Installation Guide

Basic install

Most users will be fine using the binary bundled in the default pip install:

pip install mfem

The above installation will download and install a serial version of MFEM.

Building from source

PyMFEM has many options for installation, when building from source, including:

  • Serial and parallel (MPI) wrappers
  • Using pre-built local dependencies
  • Installing additional dependencies such as
    • hypre
    • gslib
    • libceed
    • metis

Most of the options for PyMFEM can be used directly when installing via python setup.py install, e.g.

git clone git@github:mfem/PyMFEM.git
cd PyMFEM
python setup.py install --user

For example, parallel (MPI) support is built with the --with-parallel flag:

python setup.py install --with-parallel

Note: this option turns on building metis and Hypre

Commonly used flags

Flag Description
--with-parallel Install both serial and parallel versions of MFEM and the wrapper
(note: this option turns on building metis and hypre)
--mfem-branch=<reference> Download/install MFEM using a specific reference (git branch, hash, or tag)
--user Install in user's site-package

In order to see the full list of options, use

python setup.py install --help

Advanced options

Suitesparse

--with-suitesparse : build MFEM with suitesparse. suitesparse needs to be installed separately. Point to the location of suitesparse using the flag --suitesparse-prefix=<location>

Note: this option turns on building metis in serial

CUDA

--with-cuda : build MFEM with CUDA. Hypre cuda build is also supported using --with-cuda-hypre. --cuda-arch can be used to specify cuda compute capablility. (See table in https://en.wikipedia.org/wiki/CUDA#Supported_GPUs)

CUDA needs to be installed separately and nvcc must be found in PATH (Example).

(examples)

python setup.py install --with-cuda

python setup.py install --with-cuda --with-cuda-hypre

python setup.py install --with-cuda --with-cuda-hypre --cuda-arch=80 (A100)

python setup.py install --with-cuda --with-cuda-hypre --cuda-arch=75 (Turing)

gslib

--with-gslib : build MFEM with GSlib

Note: this option downloads and builds GSlib

libCEED

--with-libceed : build MFEM with libCEED

Note: this option downloads and builds libCEED

Specifying compilers

Flag Description
--CC c compiler
--CXX c++ compiler
--MPICC mpic compiler
--MPICXX mpic++ compiler

(example) Using Intel compiler

python setup.py install --with-parallel --CC=icc, --CXX=icpc, --MPICC=mpiicc, --MPICXX=mpiicpc

Building MFEM with specific version

By default, setup.py build MFEM with specific SHA (which is usually the released latest version). In order to use the latest MFEM in Github. One can specify the branch name or SHA using mfem-branch option.

--mfem-branch = <branch name or SHA>

(example)

python setup.py install --mfem-branch=master

Using MFEM build externally.

These options are used to link PyMFEM wrapper with existing MFEM library. We need --mfem-source and --mfem-prefix

Flag Description
--mfem-source <location> The location of MFEM source used to build MFEM
--mfem-prefix <location> The location of the MFEM library. libmfem.so needs to be found in <location>/lib
--mfems-prefix <location> (optional) Specify serial MFEM location separately
--mfemp-prefix <location> (optional) Specify parallel MFEM location separately

Blas and Lapack

--with-lapack : build MFEM with lapack

<location> is used for CMAKE call to buid MFEM --blas-libraries=<location> --lapack-libraries=<location>

Options for development and testing

Flag Description
--swig run swig only
--skip-swig build without running swig`
--skip-ext skip building external libraries.
--ext-only build exteranl libraries and exit.

During the development, often we update depenencies (such as MFEM) and edit *.i file.

First clean everything.

python setup.py clean --all

Then, build externals alone

python setup.py install --with-parallel --ext-only --mfem-branch=master

Then, genrate swig wrappers.

python setup.py install --with-parallel --swig --mfem-branch=master

If you are not happy with the wrapper (*.cxx and *.py), you edit *.i and redo the same. When you are happy, build the wrapper. --swig does not clean the existing wrapper. So, it will only update wrapper for updated *.i

When building a wrapper, you can use --skip-ext option. By default, it will re-run swig to generate entire wrapper codes.

python setup.py install --with-parallel --skip-ext --mfem-branch=master

If you are sure, you could use --skip-swig option, so that it compiles the wrapper codes without re-generating it.

python setup.py install --with-parallel --skip-ext --skip-swig --mfem-branch=master

Other options

--unverifiedSSL : This addresses error relating SSL certificate. Typical error message is <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:xxx)>