[Utilities] ParMmg Process

Introduction

ParMMG is the MPI parallel version of the remeshing library MMG. In order to use ParMmg, please checkout the guide on how to install and use MMG first:

MMG remeshing process install guide

As of now, ParMMG is a separate library that depends on MMG and it therefore requires another installation. ParMmg does not have all functionalities from MMG, but it currently features:

• 3D volume remeshing of tetrahedras

How to install

In order to install ParMmg in our system, we need to clone the repository.

git clone https://github.com/MmgTools/ParMmg

Once cloned, we can change directory to ParMmg, and create a build folder where the libraries will be written.

cd ParMmg;
mkdir build;
cd build;

Now, we will create and edit a configure.sh file:

touch configure.sh

In the configure file we will write the following:

cmake ..                                              \
-DCMAKE_BUILD_TYPE=Release                            \
-USE_POINTMAP=ON                                      \
-DCMAKE_CXX_FLAGS="-O3 -msse3 -fPIC -fopenmp"         \
-DCMAKE_C_FLAGS="-O3 -msse3 -fPIC -fopenmp"           \
-DLIBPARMMG_SHARED=ON                                 \
-DLIBPARMMG_STATIC=OFF                                \
-DDOWNLOAD_MMG=OFF                                    \
-DMMG_DIR="/path/to/mmg"                              \
-DMMG_BUILDDIR="/path/to/mmg/build"                   \
-DDOWNLOAD_METIS=OFF                                  \
-DMETIS_DIR="/usr/include"                            \

make -j4

Where we have set the path to the MMG installation. Please set it with the correct path in your machine. ParMmg will be linked to a certain version of MMG. For instance, v1.3.0 of ParMmg needs version v5.5.2 of MMG. This can be checked in the file:

ParMmg/CMakeLists.txt

Specified as GIT_TAG in the MMG section. We can now compile:

sh configure.sh

After compiling, we can now compile Kratos with the following extra variables. Note that Kratos will have to be compiled in MPI with the flag -DUSE_MPI=ON

-DUSE_MPI=ON                      \
-DINCLUDE_PMMG=ON                 \
-DPMMG_ROOT=/path/to/parmmg/build \

Where we have set the path to ParMmg build folder with the flag -DPMMG_ROOT. Note that this will assume that libraries are located in ParMmg/build/lib and the include folder in ParMmg/build/include. If this is not the case, you can specify the custom library and include dir with the following flags (remove PMMG_ROOT if this is the case):

-DUSE_MPI=ON                                                  \
-DINCLUDE_PMMG=ON                                             \
-DPMMG_INCLUDE_DIR=/path/to/custom/parmmg/build/include/      \
-DPMMG_LIBRARY=/path/to/custom/parmmg/build/lib/libparmmg.so  \