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linuxaffinity

Interaction between taskset and sched_setaffinity

Could anyone tell me what would occur if I ran

taskset -c 7 ./fred.x

but then inside fred.x a thread is calling sched_setaffinity to bind to core 6?

Would that thread get ANY cpu time ever, or will it remain idle indefinitely?

Solution

  • taskset itself calls sched_setaffinity() and then execve to run your command. So this question boils down to "What happens if I call sched_setaffinity() twice in the same thread?" And the answer is, the second call overrides the first.

    So in your specific example, the thread which calls sched_setaffinity() will indeed be bound to core 6, and it will be runnable.