Demoing parallel collections in Scala 2.9.0.RC1 REPL, on a MacBook Pro, 2.66 GHz Intel Core 2 Duo

scala_parallel_collections_demo.scala

~ $ scala
Welcome to Scala version 2.9.0.RC1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_24).
Type in expressions to have them evaluated.
Type :help for more information.

scala> def time(work: => Any) { val start = System.currentTimeMillis; work; println("Time: " + (System.currentTimeMillis - start) + "ms")}
time: (work: => Any)Unit

scala> time(Thread.sleep(10))
Time: 11ms

scala> val (s, p) = Option(1 to 10 toList).map(l => (l, l.par)).get
s: List[Int] = List(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
p: scala.collection.parallel.immutable.ParSeq[Int] = ParVector(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

scala> s
res1: List[Int] = List(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

scala> p
res2: scala.collection.parallel.immutable.ParSeq[Int] = ParVector(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

scala> s.foreach(e => print(e + " "))
1 2 3 4 5 6 7 8 9 10 
scala> p.foreach(e => print(e + " "))
1 2 3 4 5 6 7 8 9 10 
scala> p.foreach(e => print(e + " "))
1 2 3 4 5 6 7 8 9 10 
scala> p.foreach(e => print(e + " "))
1 2 3 4 5 6 7 8 9 10 
scala> p.foreach(e => print(e + " "))
1 2 3 4 5 6 7 8 9 10 
scala> p.foreach(e => print(e + " "))
1 2 3 4 5 8 9 10 7 6 
scala> s.filter(_ > 5)
res16: List[Int] = List(6, 7, 8, 9, 10)

scala> p.filter(_ > 5)
res17: scala.collection.parallel.immutable.ParSeq[Int] = ParVector(6, 7, 8, 9, 10)

scala> p.filter(_ > 5) == s.filter(_ > 5)
res18: Boolean = true

scala> time(s.filter(_ > 5))
Time: 1ms

scala> time(p.filter(_ > 5))
Time: 2ms

scala> time(p.filter(_ > 5))
Time: 2ms

scala> time(p.filter(_ > 5))
Time: 1ms

scala> val (s, p) = Option(1 to 100000 toList).map(l => (l, l.par)).get
s: List[Int] = List(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, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, ...
scala> time(s.filter(_ > 5))
Time: 7ms

scala> time(s.filter(_ > 5))
Time: 8ms

scala> time(p.filter(_ > 5))
Time: 22ms

scala> time(p.filter(_ > 5))
Time: 78ms

scala> val (s, p) = Option(1 to 10000000 toList).map(l => (l, l.par)).get
s: List[Int] = List(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, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, ...
scala> time(s.filter(_ > 5))
Time: 2697ms

scala> time(s.filter(_ > 5))
Time: 2796ms

scala> time(p.filter(_ > 5))
Time: 994ms

scala> time(p.filter(_ > 5))
Time: 859ms

scala> time(s.filter(_ < 5))
Time: 133ms

scala> time(s.filter(_ < 5))
Time: 135ms

scala> time(p.filter(_ < 5))
Time: 119ms

scala> time(p.filter(_ < 5))
Time: 108ms

scala> time(s.partition(_ < 5))
Time: 2566ms

scala> time(p.partition(_ < 5))
Time: 890ms