A quick mirobenchmark to benchmark the performance of Native Blas vs f2jblas

benchmark_spark_blas.scala

import org.apache.spark.mllib.linalg.{Vector, Vectors}
import com.github.fommil.netlib.{BLAS => NetlibBLAS, F2jBLAS}
import com.github.fommil.netlib.BLAS.{getInstance => NativeBLAS}

def time[R](block: => R): R = {  
    val t0 = System.nanoTime()
    val result = block    // call-by-name
    val t1 = System.nanoTime()
    println("Elapsed time: " + (t1 - t0)/1000000.0 + "ms")
    result
}

var f2jBLAS = new F2jBLAS
var nativeBLAS = NativeBLAS

val dv1: Vector = Vectors.dense((1d to 1000000d by 1d).toArray)

time {nativeBLAS.ddot(dv1.size, dv1.toDense.values, 1, dv1.toDense.values, 1)}
time {f2jBLAS.ddot(dv1.size, dv1.toDense.values, 1, dv1.toDense.values, 1)}