1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
import collection.parallel.mutable.ParCtrie
case class Entry(num: Double) {
var sqrt = num
}
object Nums extends testing.Benchmark {
val length = sys.props("length").toInt
val par = sys.props("par").toInt
var entries: Seq[Entry] = null
var results: ParCtrie[Double, Entry] = null
collection.parallel.ForkJoinTasks.defaultForkJoinPool.setParallelism(par)
override def setUp() {
entries = (1 until length) map { num => Entry(num.toDouble) }
results = ParCtrie()
for (e <- entries) results += ((e.num, e))
}
def run() = {
while (results.nonEmpty) {
for ((num, e) <- results) {
val nsqrt = 0.5 * (e.sqrt + e.num / e.sqrt)
if (math.abs(nsqrt - e.sqrt) < 0.01) {
results.remove(num)
} else e.sqrt = nsqrt
}
}
}
}
|
