Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/3221#issuecomment-85814758
@mengxr I discussed with David and the only reason I can think of is that
inside the solvers I am using DenseMatrix and DenseVector in-place of primitive
arrays for workspace creation....that might be causing the first iteration
runtime difference due to loading up the interface classes and other features
that comes with DenseMatrix and DenseVector...I can move to primitive arrays
for the workspace but then the code will look ugly...Let me know if I should ?
I am surprised that this issue does not show up after the first call !
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