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Fwiw as an SRE specialized in infrastructure for large companies, the primary limits of containers are not about resources, they're about isolation. It's hard to beat CPU hardware virtualization (VMs) for proper isolation with decent performance, but for maximizing resource utilization, containers are actually better if you aren't running untrusted code like a cloud provider. Which is why companies like Google use them at their scale. And in fact, at least for long enough for it to end up in books, ran their VMs through their container orchestration tools. Virtualization has a penalty because you're running multiple kernels and switching back and forth etc.