multicore - If I have a process with only one thread running on a multi core why is it moved from one core to another -

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why process having 1 core migrated 1 core another. assume process simple , has simple thread running. observed os moves 1 core when executing. why done? isn't there overhead continously moving process? why doesn't execute on 1 core , keep execting on same core forever?

there many answers question, obvious 1 is: heat.


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