"On systems with more than 64 logical processors, nodes are assigned to processor groups according to the capacity of the nodes. The capacity of a node is the number of processors that are present when the system starts together with any additional logical processors that can be added while the system is running."
"Systems with fewer than 64 logical processors always have a single group, Group 0."
"Support for systems that have more than 64 logical processors is based on the concept of a processor group , which is a static set of up to 64 logical processors that is treated as a single scheduling entity."
"When the system starts, the operating system creates processor groups and assigns logical processors to the groups. If the system is capable of hot-adding processors, the operating system allows space in groups for processors that might arrive while the system is running. The operating system minimizes the number of groups in a system."
"For better performance, the operating system takes physical locality into account when assigning logical processors to groups. All of the logical processors in a core, and all of the cores in a physical processor, are assigned to the same group, if possible. Physical processors that are physically close to one another are assigned to the same group. A NUMA node is assigned to a single group unless the capacity of the node exceeds the maximum group size."
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