Work out vcpu to core mapping instantly with clear inputs, formula shown and shareable results.
On most x86 cloud instances a vCPU is one hardware thread, so 32 vCPUs are 16 physical cores. That distinction matters for two reasons: per-core software licensing is charged on physical cores, and a second thread on a core adds only 20 to 30 percent throughput rather than doubling it — so a vCPU is roughly 0.6 of a core, not one.
vCPU mapping
physical cores = ceil(vCPUs / threads per core); effective throughput = cores x (1 + SMT gain); performance per vCPU = effective / vCPUs
No. AWS Graviton and some other ARM instances give one vCPU per physical core with no SMT, which is why their per-vCPU performance is noticeably higher.
For latency-sensitive or licence-constrained workloads, yes. It removes thread contention and can reduce the licensable core count on some models.