Hi! I'm from the EC2 team. This is a great tool to help uncover if CPU and memory NUMA within a VM aligns to the physical host or not: https://www.cl.cam.ac.u

Hi! I'm from the EC2 team. This is a great tool to help uncover if CPU and memory NUMA within a VM aligns to the physical host or not: https://www.cl.cam.ac.uk/research/srg/netos/projects/ipc-bench/ https://www.cl.cam.ac.uk/research/srg/netos/projects/ipc-ben... Paper from the USENIX 2012 conference: http://anil.recoil.org/papers/drafts/2012-usenix-ipc-draft1.pdf http://anil.recoil.org/papers/drafts/2012-usenix-ipc-draft1.... EC2 instances have been NUMA optimized since we launched our CC1 instances in 2010. I encourage you to try ipc-bench on your cloud provider of choice, if CPU and NUMA affinity is important to your workload.