How nova calculates vCPUs when hyper-threading is enabled in OpenStack

Solution Verified - Updated -

Issue

  • How does nova calculate virtual CPUs when hyper-threading is enabled?
  • How to calculate the vCPU count on a compute node?
  • Does the nova scheduler take hyper-threading into consideration when calculating available vcpus on a compute node?
  • How does hyper-threading affect CPU overcommit when cpu_allocation_ratio is above a value of 1?

Environment

  • Red Hat OpenStack Platform (OSP) 10, 13

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