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Yes, running on a set of heterogenous CPUs presents further challenges, for the program and the thread scheduler. Happily there are no such systems in the cloud
by jeffbee 3y ago
Yes, running on a set of heterogenous CPUs presents further challenges, for the program and the thread scheduler. Happily there are no such systems in the cloud, yet.
Most people are running on systems where the CPU capacity varies and they haven't even noticed. For example in EC2 there are 8 victim CPUs that handle all the network interrupts, so if you have an instance type with 32 CPUs, you already have 24 that are faster than the others. Practically nobody even notices this effect.
- loxias 3y ago> in EC2 there are 8 victim CPUs that handle all the network interrupts, so if you have an instance type with 32 CPUs, you already have 24 that are faster than the others Fascinating. Could you share any (all) more detail on this that you know? Is it a specific instance type, only ones that use nitro? (or only ones without?) This might be related to a problem I've seen in the wild but never tracked down...
- jeffbee 3y agoI've only observed it on Nitro, but I have also rarely used pre-Nitro instances.