Hi,all Recently I am using SLEPc to solve an sparse eigenvalue problem. I use krylov-shur and mumps as solvers.
My codes work well my corei5 dual core laptop. Compared to my old sequential solution ARPACK/UMFPACK, running with 2 process could give me 1.3x speedup. However when I install my code on another station with quad core CPU, the performance change significantly. My parallel code runs 2-3 times slower than sequential code. Is there any one who knows what happened here? Thanks a lot.
