Get/set the process's CPU affinity mask. The affinity mask binds the process to specific core(s) within the machine. Not supported on all systems, [has_affinity()] shows if this is available.
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Which cpu cores to bind to: vector of integers between 1 and [ncores()]
Setting a process afinity allows for restricting the process to only use certain cores in the machine. The cores are indexed by the operating system as 1 to [ncores()]. Calling [setaffinity()] with no arguments resets the process to use any of the available cores.
Note that setaffinity is different from setting r_limit values in the sense that it is not a one-way process. An unprivileged user can change the process affinity to any value. In order to 'lock' an affinity value, one would have to manipulate Linux capability value for CAP_SYS_NICE.
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