TauBench

This is an unstructured grid benchmark. The benchmark mimics the run-time performance of the Tau solver (a Navier Stokes solver which has been developed at the DLR in Germany). Tau is a three-dimensional parallel hybrid multigrid solver, which solves the Reynolds-averaged Navier-Stokes equations by finite volume scheme.

Install

$ make
mpicc -g -O2 flux.c -c
mpicc -g -O2 main.c -c
mpicc -g -O2 lim.c -c
mpicc -g -O2 smooth.c -c
mpicc flux.o main.o lim.o smooth.o   -lm -o taubench

To change the compiler and compiler flags

$ make 'MPICC = mpicc.mpich' 'CFLAGS = -Ofast -Wall'
mpicc.mpich -Ofast -Wall flux.c -c
mpicc.mpich -Ofast -Wall main.c -c
mpicc.mpich -Ofast -Wall lim.c -c
mpicc.mpich -Ofast -Wall smooth.c -c
mpicc.mpich flux.o main.o lim.o smooth.o   -lm -o taubench

Run

Tau supports both vector and cache colored grids, you might also need to adapt the compiler directives in nodep.inc and expand.inc. The benchmark itself can be used with two flags, the gridsize per process and the number of pseudo steps:

$ mpiexec -n 2 ./taubench -n 100000 -s 10
This is TauBench.
Evaluating kernels - please be patient.
..........

        - kernel_1_0 :      0.315 secs -   4470.269 mflops
        - kernel_1_1 :      0.131 secs -   1666.135 mflops
        - kernel_2_1 :      0.210 secs -   4733.000 mflops
        - kernel_2_2 :      0.186 secs -   6560.788 mflops
        - kernel_2_3 :      0.089 secs -   2759.613 mflops
        - kernel_2_4 :      0.069 secs -   7992.762 mflops
        - kernel_3_0 :      0.344 secs -   7952.712 mflops

               total :      1.311 secs -   9658.964 mflops

points     :     100000
steps      :         10
procs      :          2

comp       :      1.302 secs
comm       :      0.009 secs
comm ratio :      0.007