On cpu binding, hwloc manual says "It is often useful to call
hwloc_bitmap_singlify() first so that a single CPU remains in the set. This
way, the process will not even migrate between different CPUs inside the
given set" . I don't understand it. If I do not do hwloc_bitmap_singlify,
what will happen? Suppose a process's old cpu binding is oldset, and I want
to bind it to newset. What should I do to use hwloc_bitmap_singlify?
  Thank you.
--Junchao Zhang
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