I've missed the message boats a few times so... Could anyone explain the
affinity thing again. If I understood it correctly, it's used to lock a
process to a certain CPU.
More or less right. Processor affinity needn't be implmented such that a
process only runs on a certain CPU, it can also just make it more likely
that it runs on that CPU. How much of a win it is depends on a number of
factors, like what the job is, how big its primary data and code sets are,
and the cache coherency model of the machine is.
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