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At the hyper visor level, I was under the impression that many VM’s are scheduled onto the same hardware CPU core. One hardware core can be running 5 VMs at 20
by justsomeuser 5y ago
At the hyper visor level, I was under the impression that many VM’s are scheduled onto the same hardware CPU core.
One hardware core can be running 5 VMs at 20% capacity, and each VM owner will pay for 100% of their CPU capacity right? So in this case the landlord is renting your unused apartment to other customers then evicting them faster than you can open the door.
My point is cloud is benefiting from that ability and not passing it on the customers, which they could.
- sofixa 5y agoYour impression is correct for VPS-style "clouds", like Digital Ocean and co. Its fully wrong for AWS, where a vCPU you rent == physical core/thread.
- justsomeuser 5y agoHow do you know this implementation detail?
- trtechhn 5y agoThat statement is counter to how "vCPUs" related to "CPU" since early cloud implementation. AWS not taking advantage of the much more efficient "oversubscription ratio" versus thread pinning - unlikely. Are you certain of this statement?