Strong Scaling of the Discontinuous Galerkin Spectral Element code “STRUKTI” from 1 up to 4096 processors on the BlueGene cluster JUGENE in Jülich. The speciality in this investigation is that the overall number of grid cells for this computation was 4096. Thus the final computation with 4096 processors only has one grid cell on a processor. Using a local polynomial degree of N=7, the parallel efficiency was 88% .
The next two plots show the scaling up to 130,000 processors again with the 1 grid cell on a processor limit for the largest computation.