This problemis about using native BLAS to improvement ML/MLLIB performance

I use native BLAS to improvement ML/MLLIB performance on Yarn.

The file spark-env.sh which is modified by SPARK-21305 said that I should set OPENBLAS_NUM_THREADS=1 to disable multi-threading of OpenBLAS, but it does not take effect.

I modify spark.conf to set  spark.executorEnv.OPENBLAS_NUM_THREADS=1，and the performance improve.
 
 
I think MKL_NUM_THREADS is the same.