Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18936
I don't see what that has to do with it. The threading setting only affects
what native code does. A single-thread configuration should be able to saturate
CPU, too. Allowing multiple threads on top of parallelism hurts because it's
introducing some pointless context switching.
What matters are benchmarks: Java vs native code with default settings. If
that's not much different, there's really no problem with this change. And
ideally the comparison is vs OpenBLAS.
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