Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/19685
@srowen I tried enabling native BLAS, but native BLAS implementation is
still much slower: average on 10 runs is 2529,922753 ms against 515,510185 ms
of the for loop. As a reference, I am using a OSX 2.5 GHz Intel Core i7.
What is worth to notice, though, is that I tried to run the same code but
performing the `toArray` before, thus excluding its time from the computation.
In this case, native BLAS implementation is much faster: 100,969697 ms. Thus
here the "performance killer" is the conversion to array, as you pointed out.
@WeichenXu123 In the description od the PR and here you can see the tests I
made. Do you think something else is needed?
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