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It varies, a couple dozen isn't that unusual. It is on the high end though
Anywhere from one to that, I'd guess.
High frequency CPUs with a lot of cache can handle a lot more per-core. It comes down to a certain amount of overlap/Tetris.
How much monitoring/QoS do they want? Can their customers appreciate something consistent, but measurably slower?
The host might not even bother to pin - leaving it up to the kernel
edit: It gets really complicated when you consider things like NUMA
edit2: it gets even more complicated when you consider what 'on a core' really means.
They tend to share pools of cache, activities on another core impact the performance of yours.
The CPU core and 'hyper thread' are often treated as separate and I don't think they should be
thanks for the answer
i wonder how many are assigned from top providers like racknerd and nexusbytes