Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18551
I doubt the other background tasks will consume a whole additional CPU for
every task. You're saying that on a 16-core machine with 8 tasks, the other 8
CPUs are probably nearly fully utilized? I just can't see it. In any event, I
think that's why it's best to state this as something to look at, and the
principle here -- match MKL/BLAS cores to task cores -- rather than say "always
set to 1".
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