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Processor affinity takes several forms. When an operating system has a

policy of attempting to keep a process running on the same processor-but

not guaranteeing that it will do so-we have a situation known as soft affinity.

Here, it is possible for a process to migrate between processors. Some systems

-such as Linux -also provide system calls that support hard affinity, thereby

allowing a process to specify that it is not to migrate to other processors. Solaris

allows processes to be assigned to processor sets, limiting which processes can

run on which CPUs. It also implements soft affinity.

source: Operating System Concepts 8ed.

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12y ago

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