For inter-partition communications, there are definite advantages to having both partitions on the same POWER chip/book. (Indeed, there are some good optimizations in the "ibmveth" driver which appear in SLES 11 SP2 and RHEL 6.2.)
Is there a way to determine such partition layouts?
"numactl --hardware" will show NUMA nodes, memory per node, and NUMA distances between nodes for a single partition, and that information can be used to determine if that partition is contained within a single NUMA node.
Is there a way to determine if two or more partitions are all on the same NUMA node (POWER chip/book)? I've been referred to the AIX "lssrad" command, but I'm not sure what that does, or if there is a Linux equivalent?