Dear OpenMPI developers, i have a strange problem with mixed program MPI+OPENMP over OpenMPI 1.2.6. I'm using PJL TASK GEOMETRY in LSF Scheduler, setting 2 MPI process every compute node, and 2 OMP threads per process. Using paffinity and maffinity, i've noted that over every node, i have 2 thread that works 100%, and 2 threads doesn't works, or works very few.
If i disable paffinity and maffinity, 4 threads works well, without load imbalance. I don't understand this issue: paffinity and maffinity should map every thread over a specific core, optimizing the cache flow, but i have this without settings there! Can i use paffinity and maffinity in mixed MPI+OpenMP program? Or it works only over MPI thread? Thanks in advance. -- Ing. Gabriele Fatigati CINECA Systems & Tecnologies Department Supercomputing Group Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy www.cineca.it Tel: +39 051 6171722 g.fatig...@cineca.it
