Scala Results:
Scala Array Test and for loops. n=1.0e+06 completed in 0.961 seconds
Scala Array Test and while loops. n=1.0e+06 completed in 0.130 seconds
This is with Scala 2.10-M7 and JDK 7u7.
First, obvious gotcha. whlie loops run *way* faster than for loops with
ranges in Scala. I thought they were fixing that optimization issue in 2.10.
Second, Scala Array[Int] took ~1.3x as long as Java int[]. I thought Scala
was much closer from my older benchmarks. Maybe that's a JDK 7/8
difference? I don't feel like running that right now.
Code:
package scalatest
object ArrayTest {
def benchmark(name: String, runnable: () => Unit): Unit = {
val start: Long = System.nanoTime();
runnable();
val stop = System.nanoTime();
val delta = stop - start;
val seconds: Double = delta.asInstanceOf[Double] / 1000000000.0;
println("%s completed in %.3f seconds".format(name, seconds));
}
def main(args: Array[String]): Unit = {
val n = 1000000;
testWithScalaArrayAndFor(n);
testWithScalaArrayAndWhile(n);
}
def testWithScalaArrayAndFor(n: Int): Unit = {
benchmark("Scala Array Test and for loops.
n=%6.1e".format(n.asInstanceOf[Double]), () => {
val a = new Array[Int](n);
// Do something with the array...
for (i <- 0 until n) {
a(i) = i;
}
for (k <- 0 until 100) {
for (i <- 0 until n) {
a(i) = a(n-1-i) * 2;
}
}
});
}
def testWithScalaArrayAndWhile(n: Int): Unit = {
benchmark("Scala Array Test and while loops.
n=%6.1e".format(n.asInstanceOf[Double]), () => {
val a = new Array[Int](n);
// Do something with the array...
var i: Int = 0;
while (i < n) {
a(i) = i;
i += 1;
}
var k: Int = 0;
while (k < 100) {
i = 0;
while (i < n) {
a(i) = a(n-1-i) * 2;
i += 1;
}
k += 1;
}
});
}
}
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