Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/18551#discussion_r125896498
--- Diff: docs/ml-guide.md ---
@@ -61,6 +61,9 @@ To configure `netlib-java` / Breeze to use system
optimised binaries, include
project and read the [netlib-java](https://github.com/fommil/netlib-java)
documentation for your
platform's additional installation instructions.
+The most popular native BLAS such as [Intel
MKL](https://software.intel.com/en-us/mkl), OpenBLAS, are based on
multi-threading, which will conflict with Spark.
+To use multi-threading based native BLAS, you must set it to use single
thread first (SPARK-21305).
--- End diff --
Perhaps "If using a native BLAS based on multi-threading, for best
performance you must ..."
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