Hi! I'm just starting to use SLEPc on a quad-core workstation computer (Intel Core i5-2500 CPU @ 3.30GHz).
But I'm not getting the speedup that I was expecting, when increasing the number of cores. E.g. when running ex1.c from the documentation, on 1, 2, 3 and 4 cores. When asking for the 500 eigenvalues of smallest magnitude, for a 5000x5000 matrix, I'm getting the following approximate timings: # n_core time_usage 1 480s 2 400s 3 500s 4 580s Should I not expect a speedup for n_core > 2? The example is using the krylovschur algorithm. For all four runs, the program states "Number of iterations of the method: 33". I'm using PETSc 3.4.3, SLEPc 3.4.3, OpenMPI 1.6.5, and everything is compiled using GCC 4.8.1 or 4.8.2. Best regards Torquil Sørensen
