[GitHub] incubator-spark pull request: [Proposal] Adding sparse data suppor...

[mengxr]

Github user mengxr commented on the pull request:

    https://github.com/apache/incubator-spark/pull/575#issuecomment-34714242
  
    @srowen Thanks for the information! I believe native BLAS/LAPACK libraries 
performs much better than Java implementation for level 2 and level 3 
operations, but for level 1 operations, the overhead of calling native routines 
would slow down native BLAS/LAPACK. See 
    
    
https://code.google.com/p/java-matrix-benchmark/wiki/RuntimeCorei7v2600_2013_10
    
    for a recent benchmark including native netlib-java and jblas.