OpenFOAM is the free, open source computational fluid dynamics (CFD) software developed primarily by OpenCFD Ltd since 2004. It has a large user base across most areas of engineering and science, from both commercial and academic organizations. OpenFOAM has an extensive range of features to solve anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to acoustics, solid mechanics and electro-magnetics.
OpenFOAM is professionally released every six months to include customer sponsored developments and contributions from the community. It is independently tested by ESI-OpenCFD's Application Specialists, Development Partners and selected customers, and supported by ESI's worldwide infrastructure, values and commitment.
Quality assurance is based on rigorous testing. The process of code evaluation, verification and validation includes several hundred daily unit tests, a medium-sized test battery run on a weekly basis, and large industry-based test battery run prior to new version releases. Tests are designed to assess regression behavior, memory usage, code performance and scalability
This section describes how to launch two HPC Benchmarks approved by the OpenFOAM HPC Technical Committee. For the container there are OpenFoam Benchmark Scripts that have been included at /benchmark inside the container that allow running the Lid_driven_cavity-3D and HPC_motorbike benchmarks, respectively. If OpenFOAM has been installed with ROCm and MPI support, similarly to the OpenFOAM container these OpenFoam Benchmark Scripts will work in any environment.
NOTE:
All benchmarks available from the OpenFOAM HPC Technical Committee are available in the OpenFOAM Docker Image in the/benchmark/HPC_Benchmarkdirectory and can be run by following the instructions provided in the repository. Follow a similar procedure for your customized workloads/benchmarks to use PETSc solvers and enable GPU offloading.
There are a few options that can be applied to both benchmarks.
-h | --help Prints the usage
-g | --ngpus #GPUs to be used (between 1-10), defaults to 1
-r | --run-only skip mesh build, and directly run the case
-c | --clean Clean the case directory
-v | --verbose Prints all logs from different stages for easy debugging
HPC Motorbike benchmark:
./bench-hpc-motorbike.sh -g 8 -v
LID Driven Cavity 3D benchmark:
./bench-lid-driven-cavity.sh -g 8 -v
NOTE:
- If the
-gis not mentioned in commands above, by default the script will use 1 GPU. But for consistency, we recommend always adding the-gto prescribe #GPUs.- The number of GPUs can be altered to run on multiple GPUs. When #GPUs>1, the number of MPI ranks used will be equal to the number of GPUs. For example, when launched with 4 GPUs, 4 MPI ranks will be deployed. The script will automatically adjust the MPI ranks to the number of GPUs.
- It must be noted that the script is designed to run on a maximum of 10 GPUs at a time, and will require alteration if #GPUs>10 need to be used. One can also assign multiple-MPI ranks to each GPU, however that is not included in these bash scripts.
- When a benchmark is run using the script above, the mesh for the case is generated in
Stage #1. Generally this stage can take some time (~10-30mins depending on the benchmark). To re-run the benchmark with a different set of #GPU count, one can skip the pre-processing and setupStage #1by passing the-rargument to the bash script. For example, let's consider thatLid_driven_cavity-3Dbenchmark was initially run with 1 GPU. To re-run the same benchmark with 4 GPUs, one can use the following command to skipStage #1and save time on setup./bench-lid-driven-cavity.sh -g 4 -r -v
- The
-venables verbose output that prints more details for the benchmark as it runs for several time steps.
At the end of the run, the benchmark script prints the final results on the terminal and extracts the figure-of-merit (FOM) for reference. An example of the final result from the Lid_driven_cavity-3D with 8 GPUs benchmark is:
--------------------
Final results:
--------------------
PETSc-cg: Solving for p, Initial residual = 0.188515, Final residual = 7.52086e-05, No Iterations 11
time step continuity errors : sum local = 3.17586e-09, global = -9.83611e-22, cumulative = -1.89179e-20
ExecutionTime = 73.29 s ClockTime = 71 s
Time = 0.00475
Courant Number mean: 0.0594596 max: 0.486125
PETSc-bcgs: Solving for Ux, Initial residual = 0, Final residual = 5.98599e-05, No Iterations 5
PETSc-bcgs: Solving for Uy, Initial residual = 0, Final residual = 0.000125888, No Iterations 5
PETSc-bcgs: Solving for Uz, Initial residual = 0, Final residual = 0.00137425, No Iterations 5
PETSc-cg: Solving for p, Initial residual = 0.191332, Final residual = 6.81069e-05, No Iterations 11
time step continuity errors : sum local = 2.86518e-09, global = -2.08493e-22, cumulative = -1.91264e-20
PETSc-cg: Solving for p, Initial residual = 0.16702, Final residual = 6.39609e-05, No Iterations 11
time step continuity errors : sum local = 2.69255e-09, global = -2.06132e-21, cumulative = -2.11878e-20
ExecutionTime = 76.9 s ClockTime = 74 s
--------------------
FOM: Execution Time
Extracting the FOM from the final results
Time ExecutionTime (s)
-------------------
0.005 80.52
--------------------
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The application is provided in a container image format that includes the following separate and independent components:
| Package | License | URL |
|---|---|---|
| Ubuntu | Creative Commons CC-BY-SA Version 3.0 UK License | Ubuntu Legal |
| CMAKE | OSI-approved BSD-3 clause | CMake License |
| OpenMPI | BSD 3-Clause | OpenMPI License OpenMPI Dependencies Licenses |
| OpenUCX | BSD 3-Clause | OpenUCX License |
| ROCm | Custom/MIT/Apache V2.0/UIUC OSL | ROCm Licensing Terms |
| OpenFOAM | GPL v3 | OpenFOAM OpenFOAM License |
| PETSc | BSD-2 Clause | PETSc PETSc License |
| PETScFOAM | GPL V3 | PETSc4FOAM |
| HYPRE | Apache V2.0/MIT | HYPRE Licenses |
| Scotch | CeCILL-C | Scotch Web Page Scotch License |
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