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What happens when you have a vm on a core that's running avx-512? Will it also be down clocked? This is important to me since I'm orchestrating workloads on pr
by dnautics 7y ago
What happens when you have a vm on a core that's running avx-512? Will it also be down clocked? This is important to me since I'm orchestrating workloads on prem machines and my clients might want avx-512.
- Twirrim 7y agoA core is a core... whatever is running on the core will be affected by the down-clocking. It's not possible for a single core to be operating at two different speeds simultaneously. Note that a CPU can switch fairly quickly between different clock speeds. It's not instantaneous but it's pretty quick. I'd encourage CPU pinning if you can (pinning each VM to a specific core). If you're depending on oversubscribing, that won't be possible, but presumably you'd already be expecting more of an impact from noisy neighbours anyway.