yma11 commented on issue #27546: [SPARK-30773][ML]Support NativeBlas for level-1 routines URL: https://github.com/apache/spark/pull/27546#issuecomment-597999782 Perf data for nativeBLAS(mkl, openblas) and java implementation got collected on IA platform **SandyBridge**, a quite old generation of CPU. Generally, 256 is still a safe value under this scenario. Please refer attached for details. [Level1-routines-perf - part-4.xlsx](https://github.com/apache/spark/files/4322257/Level1-routines-perf.-.part-4.xlsx)
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