[jiggawatts]

Many clouds don’t guarantee that small instances won’t span NUMA nodes.

Here on HN I saw a comment by someone running VM scale sets with hundreds or even thousands of nodes and their trick was to overprovision and then delete the instances that span NUMA nodes.

[bboreham]

You’re right, it’s not guaranteed. Also the hypervisor might lie to you - claiming a single NUMA node but actually crossing two on the VM host.

[jiggawatts]

You can directly measure the core-to-core latency.