Feel++

feelpp_mesh_partitioner

feelpp_mesh_partitioner is a simple application which can generate a partitioned mesh and save it in a Feel++ specific json+hdf5 file format. The generated mesh can then be loaded very efficiently in parallel.

Options

feelpp_mesh_partitioner requires some options.

Table 1. Table of command-line feelpp_mesh_partitioner options

Name

Description

Default value

dim

dimension of the mesh

3

shape

shape of the mesh elements

Simplex

part

number of desired partitions

ifile

name or path to the mesh

ofile

output filename prefix (without extension)

odir

output directory

Examples

We are now using the feelpp/toolboxes:latest docker images as described in Getting Started to demonstrate feelpp_mesh_partitioner usage. We use the meshes in src/feelpp/data/gmsh/primitives in the docker image.

Starting the docker feelpp/toolboxes:latest
docker run -ti -v $HOME/feel:/feel feelpp/toolboxes:latest

Generating a single mesh partitioning

We generate a mesh partitioned on 4 cores with the following command

feelpp_mesh_partitioner --part 4  --ifile src/feelpp/data/gmsh/primitives/torus.geo --ofile torus

You should have in the current directory 4 files

ls torus*
torus.geo  torus.h5  torus.json  torus.msh

Now the file torus.json can be loaded in a Feel++ application distributed on 4 cores.

Generating multiple mesh partitioning

Often we are interested in a set of partitioned meshes in order to do a speed-up study. feelpp_mesh_partitioner is the right tool for that. Let’s consider a set of partitions \$\mathcal{P}=\{2, 4, 8, 16, 32 \}\$.

feelpp_mesh_partitioner --part 2 4 8 16 32  --ifile src/feelpp/data/gmsh/primitives/torus.geo --odir torus

You should have in the directory torus (thanks to the odir option) 5 partitioned meshes

ls torus*
torus_p16.h5    torus_p2.h5    torus_p32.h5    torus_p4.h5    torus_p8.h5
torus_p16.json  torus_p2.json  torus_p32.json  torus_p4.json  torus_p8.json
The mesh filenames contain the partition information.