From a Vector Computer to an SMP-Cluster Hybrid Parallelization of the CFD Code PANTA

Transforming a well vectorized Fortran77 CFD code into a more flexible Fortran90 program using a hybrid parallelization model still is an adventure. Here we report on our experiences with PANTA, a 3D Navier-Stokes solver that is extensively used in the modeling of turbomachinery. During this ongoing process various software tools are employed: Hewlett Packard's, Silicon Garphics', Portland Group's, and SUN's autoparallelizing Fortran90 compilers, various serial runtime performance analyzers, Simulog's Foresys Fortran Engineering System in combination with AWK scripts, Etnus' TotalView parallel debugger, Kuck & Associates' KAP/Pro Toolset and Visual KAP for OpenMP preprocessor and Pallas' Vampir performance analysis tools for MPI programs. A few suggestions for an improved integration of automatic and explicit parallelization are made.