-
Hello,
Reverting back with feedback for some of the questions:
Q1) Keeping the process within one node is the best option for performance. However, if the working set exceeds one node’s memory capacity, it then has to spill in to other nodes.
Q2) No, this rarely helps with recent kernels. This discussion will be removed altogether from code.kx.com. The default for modern systems is 0, which should be fine. (Regardless, this setting has no effect if confining the process to a single node)
Q3) No, the default NUMA policy attempts to allocate from the current node, and from others if no free memory is available. See https://man7.org/linux/man-pages/man2/set_mempolicy.2.html for more details.
Q4) You would usually express that as “numactl -N 0 -m 0” (allocate from node 0, and also run on the cores that belong to node 0)
I hope this information helps.
Many Thanks
Luke