Hi all, We have an 8-node cluster of SMP nodes, which have dual-quad core processors. The network is Infiniband. Each process in our parallel FORTRAN 90 program holds an identical array that is used in all parts of the program. However, when the size of the problem gets larger and larger, this memory cost has started to become a memory bottleneck for us. If all 8 processes in the same node could just read from the same memory instead of holding their arrays, we would have significant memory gain. This would be natural in a node if were to use OpenMP, but I wonder whether this is somehow possible with only MPI? We know that passing to hybrid programming (MPI + OpenMP) is a choice, but we look for simpler choices for the time being. In another post I have seen something like "you could share the memory between processes using the shm_xxx system calls of unix", but this isn't clear to me. Thanks in advance,
Tahir Malas Bilkent University Electrical and Electronics Engineering Department Phone: +90 312 290 1385
