FE is a Finite Element mini-application which implements a couple of kernels representative of implicit finite-element applications. It assembles a sparse linear-system from the steady-state conduction equation on a brick-shaped problem domain of linear 8-node hex elements. It then solves the linear-system using a simple un-preconditioned conjugate-gradient algorithm.
Thus the kernels that it contains are:
- computation of element-operators (diffusion matrix, source vector)
- assembly (scattering element-operators into sparse matrix and vector)
- sparse matrix-vector product (during CG solve)
- vector operations (level-1 blas: axpy, dot, norm)
This version of miniFE has support for OpenMP. However, it is not deemed to be complete and/or optimal. Offerors will need to tune it to their particular architecture.
This version of miniFE corresponds to miniFE_ref_1.4b.
How to Build
$ tar xzf miniFE_ref_1.4b.tgz
$ cd miniFE_ref_1.4b
Edit makefile for your environment
How to Run
miniFE requires three input parameters which dictate the dimensionality of the problem. The primary purpose of specifying dimensionality is to set the memory footprint. Note that running miniFE with a fixed set of dimensions using a varying number of MPI ranks is a strong scaling method, i.e., the problem size is fixed with the dimension parameters.
There are scripts for running the small, large and extra large problems as defined in the Trinity/NERSC-8 run rules document. The scripts are called run-<problem size>.sh for the respective size problems. The small problem is sized to use approximately 96 GB of main memory, medium is sized for ~32 TB and the extra large problem is ~960 TB. The scripts are configured for running on NERSC's Hopper machine, the number of MPI ranks can be modified to suit the Offeror's target architecture.
Results are written to a YAML file. From the YAML files, report
"Total CG Time" and "Total CG Mflops".
Michael A. Heroux, Sandia National Laboratories
- Initial MiniGhostv0.9.tar file and web page; this version corresponds to miniFE_ref_1.4b