Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18936
BLAS doesn't work on sparse data. All of those invocations are on dense
data of some kind. Many of the remaining ones operate on dense matrices even;
they're not even level 1. I think all of them would change if you're measuring
that level 1 is worth using BLAS for.
CC @MLnick as well as I see comments from him also suggesting that Java is
faster for level 1. I'm still kind of unsure what to make of your benchmarks
which disagree with previous ones, apparently. What's different?
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