Sergey Sharybin
ce927e15e0
The idea is to make main thread and job threads to be scheduled on CPU dies which has direct access to memory (those are NUMA nodes 0 and 2). We also do this for new EPYC CPUs since their NUMA nodes 1 and 3 do have access but only to a higher range DDR slots. By preferring nodes 0 and 2 on EPYC we make it so users with partially filled DDR slots has fast memory access. One thing which is not really solved yet is localization of memory allocation: we do not guarantee that memory is allocated on the closest to the NUMA node DDR slot and hope that memory manager of OS is acting in favor of us.