srowen commented on issue #27546: [SPARK-30773][ML]Support NativeBlas for level-1 routines URL: https://github.com/apache/spark/pull/27546#issuecomment-590885475 I think we could be conservative and let it switch over at operation on >= 256 elements? that seems like a win. It sounds like even when the cores are over-subscribed it could still be fast-er enough to justify than f2jblas
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