9. Running MFiX on Joule¶

This section is for MFiX users on NETL’s HPC system Joule. MFiX is installed as an environment module, so installing it yourself is not necessary. The following sections document which compiler modules to use on Joule to run MFiX and build the solver.

To build the solver from the GUI with a particular compiler on Joule, you need the environment module for that compiler loaded when before starting MFiX. If that compiler is not loaded, exit MFiX to go back to your shell, load the appropriate module, and start MFiX again.

To avoid confusion, use module list and module unload to check that you only have one version (e.g. 8.2, 6.5, 6.4) of one particular compiler (e.g. gnu, intel) loaded at any given time!

9.1. Running the GUI¶

Load the MFiX 21.2 module:
```
> module load mfix/21.2
```

Run the GUI:
```
> vglrun mfix
```
To build from the GUI, see: Building Custom Interactive Solver.
To build from the command line, run:
```
> build_mfixsolver
```

With just mfix/21.2 environment module loaded, you can build the MFiX solver in serial with GCC 4.8 (the CentOS system compiler). For building the solver with other configurations, see below.

9.2. Building Solver with GCC¶

At the time of this writing, Joule has modules for GCC 6.4, 6.5, 8.2, 8.4, and 9.3. GCC 8.2 or newer is recommended.

> module load gnu/8.2.0                                            # if only using serial
> module load gnu/8.2.0 openmpi/4.0.1_gnu8.2                       # if using DMP

> module load gnu/6.5.0                                           # if only using serial
> module load gnu/6.5.0 openmpi/3.1.3_gnu6.5                      # if using DMP

When building from the command line:

> build_mfixsolver -s none           # for serial, no interactive support
> build_mfixsolver -s none --dmp     # for DMP, no interactive support

When building from the GUI:

For DMP support, check the DMP checkbox (on the Build Dialog)

Default interactive support is python (recommended)

9.3. Building Solver with Intel Fortran Compiler¶

Load module:

> module load intel/2019.2.053                      # if only using serial
> module load intel/2019.2.053 intelmpi/2019.2.144  # if using DMP

When building from the command line:

> build_mfixsolver -s none        # for serial
> build_mfixsolver -s none --dmp  # for DMP

Building an Interactive solver with Intel compiler is not supported.

When building from the GUI:

Check “Enable developer mode” under Settings, then select Interactive support: “None” (on the Build Dialog)

For DMP support, check the DMP checkbox (on the Build Dialog)

9.4. Building Solver from Source Tarball¶

To build the solver from the MFiX source tarball or from a Git repo, you do not need to load the mfix/21.2 module. Instead, you only need to load the CMake module:

> module load cmake/3.14.1

Also load the GCC or Intel module for the compiler you want to use. For complete instructions on building the solver from source, see Build from Source (for Developers).