I have an Openstack autopilot deployment on 3 physical machine and intend to evaluate interference between collocates vms on a single physical core. For this purpose I'm looking for a detailed & Ubuntu-specific instructions on how to pin a vm to a specific pCpu so I could have multiple vms on the same core & go on to my experiment. Any advice would make a big difference on how much time I'm gonna spent in this step. Thanks.

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You'll want to either create a new flavour, or edit one of the existing flavours (using the admin credentials available in the Autopilot dashboard) - and follow the "CPU pinning section" of the OpenStack admin docs here:

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