Thornado

[banach-space]

Enable building and execution of the Thornado application with the LLVM Flang compiler.

[Sezoir]

Next steps: I am not planning to take on this project. This is just an initial report found. Please feel free to work on this.

thornado:

https://proxyapps.exascaleproject.org/app/thornado-mini/
https://github.com/ECP-Astro/thornado_mini

The thornado application requires the following to build:

• MPI (For this I used openmpi as a wrapper compiler around gfortran)
• hdf5
• lapack (for this report I used openblas which has lapack included with it)

Initial report for thornado:

• Minimum version of Fortran required using gfortran: F2008

  • Required arguments to compile with version: "-fdec"

• How to compile with gfortran:

  1. First you can download the project by running in bash:

  git clone https://github.com/ECP-Astro/thornado_mini.git
  cd thornado_mini
  

  2. Now download this patch thornado.patch.txt and remove the .txt extension. This patch just adds support for mpi gnu. Support for compilers can be added by modifying the Build/Makefile_Compilers makefile. You can then apply the patch with:

  git am -3 thornado.patch
  

  3. Next load your hdf5 and openblas modules. Alternatively, you can manually set the following environment variables appropriately: HDF5_INC, OPENBLAS_INC, HDF5_LIB, OPENBLAS_LIB.
  4. Now you can compile the project by running:

  cd DeleptonizationProblem/Executables
  make THORNADO_DIR=../../ THORNADO_MACHINE=gnu
  

        In order to do a clean build, you can use: make THORNADO_DIR=../../ clean

• Does it compile with flang-new: No
  Requires an MPI compiler, which flang-new does not currently support. You may be able to hack ompi to add support for flang-new since it is just a wrapper compiler, but I am not sure how much effort would be required.
  A quick test in substituting the MPI Fortran compiler with flang-new results in us requiring MPI library before any other potential compiler errors.

Versions:

• gfortran version used: 9.3.0
• flang-new, fir-dev branch, HEAD: fb8eb63
• openmpi version used: 4.1.1
• thornado_mini, master, HEAD: 43d565ed9cfbef605893f85a8ef7999eb65e301f
• hdf5, version used 1.10.6
• openblas, version used 0.3.10
• Architecture for compilation: aarch64