奇怪的行为：Scala Actors 2.7.7 vs.2.8-Snapshot_Scala_Concurrency_Scala 2.8_Actor_Scala 2.7

奇怪的行为：Scala Actors 2.7.7 vs.2.8-Snapshot

scala concurrency

奇怪的行为：Scala Actors 2.7.7 vs.2.8-Snapshot,scala,concurrency,scala-2.8,actor,scala-2.7,Scala,Concurrency,Scala 2.8,Actor,Scala 2.7,我是一名18岁的实习生，我正在发现我非常喜欢的scala:-）。为了熟悉scala演员，我编写了一个带有一些齿轮和一个控制器的小型模拟。ActorApplication以随机速度创建N个齿轮。控制器计算同步速度并启动齿轮执行器。齿轮逐步（1+或1-）同步到此给定速度。当所有档位都达到同步速度时，模拟完成。我在scala 2.7.7中开发了这个模拟——它按照我的预期工作（见下面的输出）。然而，当我切换到当前的2.8.0快照时，我发现了奇怪的行为。代码如下： /** * Created by

我是一名18岁的实习生，我正在发现我非常喜欢的scala:-）。为了熟悉scala演员，我编写了一个带有一些齿轮和一个控制器的小型模拟。ActorApplication以随机速度创建N个齿轮。控制器计算同步速度并启动齿轮执行器。齿轮逐步（1+或1-）同步到此给定速度。当所有档位都达到同步速度时，模拟完成。我在scala 2.7.7中开发了这个模拟——它按照我的预期工作（见下面的输出）。然而，当我切换到当前的2.8.0快照时，我发现了奇怪的行为。代码如下：

/**
 * Created by IntelliJ IDEA.
 * User: pmei
 */
import actors.Actor
import actors.Actor._
import collection.mutable.ListBuffer
import java.util.Random

case class ReceivedSpeed(gear: Gear)
case class StartSync

case class SyncGear(controller: GearController, syncSpeed: Int)

object ActorApplication extends Application {
  private val random = new Random() //scala.util random won't be random :(

  println("[App] start with creating gears")
  val gearList = new ListBuffer[Gear]()
  for (i <- 0 until 100) {
    gearList += new Gear(i)
  }

  val gearController = new GearController(gearList)

  gearController.start()
  gearController ! StartSync()
}

/**
 * CONTROLLER
 */
class GearController(nGears: ListBuffer[Gear]) extends Actor {

  private var syncGears = new ListBuffer[Gear]
  private var syncSpeed = 0
  def act = {
    loop {
      react {
        case StartSync() => {
          println("[Controller] Send commands for syncing to gears!")
          var speeds = new ListBuffer[Int]
          nGears.foreach(e => speeds += e.speed)

          //Calc avg
          //var avgSpeed = speeds.foldLeft(0)(_ + _) / speeds.length
          //var avgSpeed = speeds.foldLeft(0) { (x, y) => x + y } / speeds.length
          syncSpeed = (0/:speeds)(_ + _) / speeds.length //Average over all gear speeds

          println("[Controller] calculated syncSpeed: "+syncSpeed)
          nGears.foreach{e =>
                         e.start()
                         e ! SyncGear(this, syncSpeed)
          }
          println("[Controller] started all gears")
        }
        case ReceivedSpeed(gear: Gear) => {
          println("[Controller] Syncspeed received by a gear ("+gear.gearId+")")
          //println("[Controller] mailboxsize: "+self.mailboxSize)
          syncGears += gear
          if(syncGears.length == nGears.length) {
            println("[Controller] all gears are back in town!")
            System.exit(0)
          }
        }
        case _ => println("[Controller] No match :(")
      }
    }
  }
}

/**
 * GEAR
 */
class Gear(id: Int) extends Actor {

  private val random = new Random() //scala.util random won't be random :(
  private var mySpeed = random.nextInt(1000)
  private var myController: GearController = null

  def speed = mySpeed
  def gearId = id

  println("[Gear ("+id+")] created with speed: "+mySpeed)

  def act = {
    loop {
      react {
        case SyncGear(controller: GearController, syncSpeed: Int) => {
          //println("[Gear ("+id+")] activated, try to follow controller command (form mySpeed ("+mySpeed+") to syncspeed ("+syncSpeed+")")
          myController = controller
          adjustSpeedTo(syncSpeed)
        }
      }
    }
  }

  def adjustSpeedTo(targetSpeed: Int) = {
    if(targetSpeed > mySpeed) {
      mySpeed += 1
      self ! SyncGear(myController, targetSpeed)
    }else if(targetSpeed < mySpeed) {
      mySpeed -= 1
      self ! SyncGear(myController, targetSpeed)
    } else if(targetSpeed == mySpeed) {
      callController
    }
  }

  def callController = {
    println("[Gear ("+id+")] has syncSpeed")
    myController ! ReceivedSpeed(this)
  }
}

您可以看到不同参与者（齿轮和控制器）的交替输出。但如果我改为scala 2.8，我会得到如下输出：

[App] start with creating gears
[Gear (0)] created with speed: 995
[Gear (1)] created with speed: 40
[Gear (2)] created with speed: 483
[Gear (3)] created with speed: 920
[Gear (4)] created with speed: 339
[Gear (5)] created with speed: 422
[Gear (6)] created with speed: 258
[Gear (7)] created with speed: 603
[Gear (8)] created with speed: 40
[Gear (9)] created with speed: 399
[Gear (10)] created with speed: 347
[Gear (11)] created with speed: 339
[Gear (12)] created with speed: 559
[Gear (13)] created with speed: 697
[Gear (14)] created with speed: 18
[Gear (15)] created with speed: 568
[Gear (16)] created with speed: 271
[Gear (17)] created with speed: 239
[Gear (18)] created with speed: 889
[Gear (19)] created with speed: 933
[Gear (20)] created with speed: 793
[Gear (21)] created with speed: 494
[Gear (22)] created with speed: 683
[Gear (23)] created with speed: 41
[Gear (24)] created with speed: 738
[Gear (25)] created with speed: 291
[Gear (26)] created with speed: 833
[Gear (27)] created with speed: 610
[Gear (28)] created with speed: 514
[Gear (29)] created with speed: 793
[Gear (30)] created with speed: 917
[Gear (31)] created with speed: 838
[Gear (32)] created with speed: 801
[Gear (33)] created with speed: 153
[Gear (34)] created with speed: 19
[Gear (35)] created with speed: 549
[Gear (36)] created with speed: 524
[Gear (37)] created with speed: 912
[Gear (38)] created with speed: 517
[Gear (39)] created with speed: 586
[Gear (40)] created with speed: 662
[Gear (41)] created with speed: 143
[Gear (42)] created with speed: 147
[Gear (43)] created with speed: 445
[Gear (44)] created with speed: 1
[Gear (45)] created with speed: 366
[Gear (46)] created with speed: 397
[Gear (47)] created with speed: 523
[Gear (48)] created with speed: 920
[Gear (49)] created with speed: 91
[Gear (50)] created with speed: 316
[Gear (51)] created with speed: 573
[Gear (52)] created with speed: 956
[Gear (53)] created with speed: 615
[Gear (54)] created with speed: 636
[Gear (55)] created with speed: 385
[Gear (56)] created with speed: 422
[Gear (57)] created with speed: 574
[Gear (58)] created with speed: 882
[Gear (59)] created with speed: 274
[Gear (60)] created with speed: 371
[Gear (61)] created with speed: 971
[Gear (62)] created with speed: 999
[Gear (63)] created with speed: 990
[Gear (64)] created with speed: 367
[Gear (65)] created with speed: 646
[Gear (66)] created with speed: 957
[Gear (67)] created with speed: 187
[Gear (68)] created with speed: 432
[Gear (69)] created with speed: 472
[Gear (70)] created with speed: 899
[Gear (71)] created with speed: 325
[Gear (72)] created with speed: 615
[Gear (73)] created with speed: 315
[Gear (74)] created with speed: 425
[Gear (75)] created with speed: 441
[Gear (76)] created with speed: 679
[Gear (77)] created with speed: 125
[Gear (78)] created with speed: 706
[Gear (79)] created with speed: 455
[Gear (80)] created with speed: 15
[Gear (81)] created with speed: 155
[Gear (82)] created with speed: 669
[Gear (83)] created with speed: 590
[Gear (84)] created with speed: 457
[Gear (85)] created with speed: 574
[Gear (86)] created with speed: 1
[Gear (87)] created with speed: 472
[Gear (88)] created with speed: 763
[Gear (89)] created with speed: 329
[Gear (90)] created with speed: 385
[Gear (91)] created with speed: 176
[Gear (92)] created with speed: 674
[Gear (93)] created with speed: 528
[Gear (94)] created with speed: 702
[Gear (95)] created with speed: 328
[Gear (96)] created with speed: 82
[Gear (97)] created with speed: 833
[Gear (98)] created with speed: 101
[Gear (99)] created with speed: 950
[Controller] Send commands for syncing to gears!
[Controller] calculated syncSpeed: 504
[Controller] started all gears
[Gear (2)] has syncSpeed
[Gear (0)] has syncSpeed
[Gear (5)] has syncSpeed
[Gear (1)] has syncSpeed
[Gear (4)] has syncSpeed
[Gear (8)] has syncSpeed
[Gear (9)] has syncSpeed
[Gear (7)] has syncSpeed
[Gear (10)] has syncSpeed
[Gear (11)] has syncSpeed
[Gear (12)] has syncSpeed
[Gear (13)] has syncSpeed
[Gear (15)] has syncSpeed
[Gear (14)] has syncSpeed
[Gear (3)] has syncSpeed
[Gear (16)] has syncSpeed
[Gear (17)] has syncSpeed
[Gear (18)] has syncSpeed
[Gear (21)] has syncSpeed
[Gear (6)] has syncSpeed
[Gear (22)] has syncSpeed
[Gear (24)] has syncSpeed
[Gear (23)] has syncSpeed
[Gear (25)] has syncSpeed
[Gear (20)] has syncSpeed
[Gear (28)] has syncSpeed
[Gear (29)] has syncSpeed
[Gear (26)] has syncSpeed
[Gear (19)] has syncSpeed
[Gear (32)] has syncSpeed
[Gear (31)] has syncSpeed
[Gear (33)] has syncSpeed
[Gear (35)] has syncSpeed
[Gear (36)] has syncSpeed
[Gear (30)] has syncSpeed
[Gear (38)] has syncSpeed
[Gear (39)] has syncSpeed
[Gear (34)] has syncSpeed
[Gear (40)] has syncSpeed
[Gear (41)] has syncSpeed
[Gear (42)] has syncSpeed
[Gear (27)] has syncSpeed
[Gear (45)] has syncSpeed
[Gear (46)] has syncSpeed
[Gear (47)] has syncSpeed
[Gear (44)] has syncSpeed
[Gear (43)] has syncSpeed
[Gear (48)] has syncSpeed
[Gear (50)] has syncSpeed
[Gear (51)] has syncSpeed
[Gear (49)] has syncSpeed
[Gear (53)] has syncSpeed
[Gear (37)] has syncSpeed
[Gear (54)] has syncSpeed
[Gear (56)] has syncSpeed
[Gear (57)] has syncSpeed
[Gear (59)] has syncSpeed
[Gear (58)] has syncSpeed
[Gear (60)] has syncSpeed
[Gear (55)] has syncSpeed
[Gear (52)] has syncSpeed
[Gear (62)] has syncSpeed
[Gear (63)] has syncSpeed
[Gear (64)] has syncSpeed
[Gear (65)] has syncSpeed
[Gear (67)] has syncSpeed
[Gear (68)] has syncSpeed
[Gear (69)] has syncSpeed
[Gear (61)] has syncSpeed
[Gear (70)] has syncSpeed
[Gear (72)] has syncSpeed
[Gear (66)] has syncSpeed
[Gear (74)] has syncSpeed
[Gear (73)] has syncSpeed
[Gear (75)] has syncSpeed
[Gear (76)] has syncSpeed
[Gear (79)] has syncSpeed
[Gear (71)] has syncSpeed
[Gear (78)] has syncSpeed
[Gear (77)] has syncSpeed
[Gear (82)] has syncSpeed
[Gear (80)] has syncSpeed
[Gear (84)] has syncSpeed
[Gear (83)] has syncSpeed
[Gear (85)] has syncSpeed
[Gear (87)] has syncSpeed
[Gear (88)] has syncSpeed
[Gear (81)] has syncSpeed
[Gear (86)] has syncSpeed
[Gear (89)] has syncSpeed
[Gear (90)] has syncSpeed
[Gear (93)] has syncSpeed
[Gear (94)] has syncSpeed
[Gear (91)] has syncSpeed
[Gear (95)] has syncSpeed
[Gear (96)] has syncSpeed
[Gear (92)] has syncSpeed
[Gear (97)] has syncSpeed
[Controller] Syncspeed received by a gear (2)
[Controller] Syncspeed received by a gear (0)
[Controller] Syncspeed received by a gear (5)
[Controller] Syncspeed received by a gear (1)
[Controller] Syncspeed received by a gear (4)
[Controller] Syncspeed received by a gear (8)
[Controller] Syncspeed received by a gear (9)
[Controller] Syncspeed received by a gear (7)
[Controller] Syncspeed received by a gear (10)
[Controller] Syncspeed received by a gear (11)
[Controller] Syncspeed received by a gear (12)
[Controller] Syncspeed received by a gear (13)
[Controller] Syncspeed received by a gear (15)
[Controller] Syncspeed received by a gear (14)
[Controller] Syncspeed received by a gear (3)
[Controller] Syncspeed received by a gear (16)
[Controller] Syncspeed received by a gear (17)
[Controller] Syncspeed received by a gear (18)
[Controller] Syncspeed received by a gear (21)
[Controller] Syncspeed received by a gear (6)
[Controller] Syncspeed received by a gear (22)
[Controller] Syncspeed received by a gear (24)
[Controller] Syncspeed received by a gear (23)
[Controller] Syncspeed received by a gear (25)
[Controller] Syncspeed received by a gear (20)
[Controller] Syncspeed received by a gear (28)
[Controller] Syncspeed received by a gear (29)
[Controller] Syncspeed received by a gear (26)
[Controller] Syncspeed received by a gear (19)
[Controller] Syncspeed received by a gear (32)
[Controller] Syncspeed received by a gear (31)
[Controller] Syncspeed received by a gear (33)
[Controller] Syncspeed received by a gear (35)
[Controller] Syncspeed received by a gear (36)
[Controller] Syncspeed received by a gear (30)
[Controller] Syncspeed received by a gear (38)
[Controller] Syncspeed received by a gear (39)
[Controller] Syncspeed received by a gear (34)
[Controller] Syncspeed received by a gear (40)
[Controller] Syncspeed received by a gear (41)
[Controller] Syncspeed received by a gear (42)
[Controller] Syncspeed received by a gear (27)
[Gear (98)] has syncSpeed
[Gear (99)] has syncSpeed
[Controller] Syncspeed received by a gear (45)
[Controller] Syncspeed received by a gear (46)
[Controller] Syncspeed received by a gear (47)
[Controller] Syncspeed received by a gear (44)
[Controller] Syncspeed received by a gear (43)
[Controller] Syncspeed received by a gear (48)
[Controller] Syncspeed received by a gear (50)
[Controller] Syncspeed received by a gear (51)
[Controller] Syncspeed received by a gear (49)
[Controller] Syncspeed received by a gear (53)
[Controller] Syncspeed received by a gear (37)
[Controller] Syncspeed received by a gear (54)
[Controller] Syncspeed received by a gear (56)
[Controller] Syncspeed received by a gear (57)
[Controller] Syncspeed received by a gear (59)
[Controller] Syncspeed received by a gear (58)
[Controller] Syncspeed received by a gear (60)
[Controller] Syncspeed received by a gear (55)
[Controller] Syncspeed received by a gear (52)
[Controller] Syncspeed received by a gear (62)
[Controller] Syncspeed received by a gear (63)
[Controller] Syncspeed received by a gear (64)
[Controller] Syncspeed received by a gear (65)
[Controller] Syncspeed received by a gear (67)
[Controller] Syncspeed received by a gear (68)
[Controller] Syncspeed received by a gear (69)
[Controller] Syncspeed received by a gear (61)
[Controller] Syncspeed received by a gear (70)
[Controller] Syncspeed received by a gear (72)
[Controller] Syncspeed received by a gear (66)
[Controller] Syncspeed received by a gear (74)
[Controller] Syncspeed received by a gear (73)
[Controller] Syncspeed received by a gear (75)
[Controller] Syncspeed received by a gear (76)
[Controller] Syncspeed received by a gear (79)
[Controller] Syncspeed received by a gear (71)
[Controller] Syncspeed received by a gear (78)
[Controller] Syncspeed received by a gear (77)
[Controller] Syncspeed received by a gear (82)
[Controller] Syncspeed received by a gear (80)
[Controller] Syncspeed received by a gear (84)
[Controller] Syncspeed received by a gear (83)
[Controller] Syncspeed received by a gear (85)
[Controller] Syncspeed received by a gear (87)
[Controller] Syncspeed received by a gear (88)
[Controller] Syncspeed received by a gear (81)
[Controller] Syncspeed received by a gear (86)
[Controller] Syncspeed received by a gear (89)
[Controller] Syncspeed received by a gear (90)
[Controller] Syncspeed received by a gear (93)
[Controller] Syncspeed received by a gear (94)
[Controller] Syncspeed received by a gear (91)
[Controller] Syncspeed received by a gear (95)
[Controller] Syncspeed received by a gear (96)
[Controller] Syncspeed received by a gear (92)
[Controller] Syncspeed received by a gear (97)
[Controller] Syncspeed received by a gear (98)
[Controller] Syncspeed received by a gear (99)
[Controller] all gears are back in town!

    while(true) {
      receive {
        case StartSync => {

你可以看到，演员之间的交互要少得多。我怀疑档位工作时控制器被阻塞。有人能解释一下这种行为吗？谢谢

Philipp

代码有一些问题。首先，不要这样做：

object ActorApplication extends Application

case class StartSync

当您使用

扩展应用程序时

，您的代码的运行方式会施加许多限制，例如不能通过JIT进行优化，并且与您的情况特别相关的是，线程无法正常工作。我发现解释2.7.7发生的事情比解释2.8发生的事情更难。相反，只需编写一个普通对象，并定义

main

方法

其他材料：

gearController ! StartSync()

不要这样做。始终从actor内部向actor发送消息，这一行位于

ActorApplication

constructor内部，它不是actor。在这种情况下，您可以这样做：

Actor.actor { gearController ! StartSync() }

说到启动同步，不要这样做：

object ActorApplication extends Application

case class StartSync

没有参数的类是没有意义的（不推荐使用）。相反，请执行以下操作：

case object StartSync

并将括号放在使用它的地方的

StartSync

后面

另外，

scala.util.Random

也没有什么问题，尽管在scala 2.7上比在scala 2.8上更容易滥用它，每次需要一个随机数时都创建一个新的

Random

生成器（这是您在代码中所做的）。相反，在Scala 2.8上，这应该是可行的：

  private var mySpeed = scala.util.Random.nextInt(1000)

最后，这两种执行都没有问题，只是调度程序不同而已。事实上，假设您创建了100个参与者，

GearController

在Scala 2.7版本中收到了不成比例的执行时间，因为Scala并没有为每个参与者创建线程

现在，如果希望

GearController

不与其他线程共享线程，则应使用

while（true）

receive

，而不是

loop

react

，如下所示：

[App] start with creating gears
[Gear (0)] created with speed: 995
[Gear (1)] created with speed: 40
[Gear (2)] created with speed: 483
[Gear (3)] created with speed: 920
[Gear (4)] created with speed: 339
[Gear (5)] created with speed: 422
[Gear (6)] created with speed: 258
[Gear (7)] created with speed: 603
[Gear (8)] created with speed: 40
[Gear (9)] created with speed: 399
[Gear (10)] created with speed: 347
[Gear (11)] created with speed: 339
[Gear (12)] created with speed: 559
[Gear (13)] created with speed: 697
[Gear (14)] created with speed: 18
[Gear (15)] created with speed: 568
[Gear (16)] created with speed: 271
[Gear (17)] created with speed: 239
[Gear (18)] created with speed: 889
[Gear (19)] created with speed: 933
[Gear (20)] created with speed: 793
[Gear (21)] created with speed: 494
[Gear (22)] created with speed: 683
[Gear (23)] created with speed: 41
[Gear (24)] created with speed: 738
[Gear (25)] created with speed: 291
[Gear (26)] created with speed: 833
[Gear (27)] created with speed: 610
[Gear (28)] created with speed: 514
[Gear (29)] created with speed: 793
[Gear (30)] created with speed: 917
[Gear (31)] created with speed: 838
[Gear (32)] created with speed: 801
[Gear (33)] created with speed: 153
[Gear (34)] created with speed: 19
[Gear (35)] created with speed: 549
[Gear (36)] created with speed: 524
[Gear (37)] created with speed: 912
[Gear (38)] created with speed: 517
[Gear (39)] created with speed: 586
[Gear (40)] created with speed: 662
[Gear (41)] created with speed: 143
[Gear (42)] created with speed: 147
[Gear (43)] created with speed: 445
[Gear (44)] created with speed: 1
[Gear (45)] created with speed: 366
[Gear (46)] created with speed: 397
[Gear (47)] created with speed: 523
[Gear (48)] created with speed: 920
[Gear (49)] created with speed: 91
[Gear (50)] created with speed: 316
[Gear (51)] created with speed: 573
[Gear (52)] created with speed: 956
[Gear (53)] created with speed: 615
[Gear (54)] created with speed: 636
[Gear (55)] created with speed: 385
[Gear (56)] created with speed: 422
[Gear (57)] created with speed: 574
[Gear (58)] created with speed: 882
[Gear (59)] created with speed: 274
[Gear (60)] created with speed: 371
[Gear (61)] created with speed: 971
[Gear (62)] created with speed: 999
[Gear (63)] created with speed: 990
[Gear (64)] created with speed: 367
[Gear (65)] created with speed: 646
[Gear (66)] created with speed: 957
[Gear (67)] created with speed: 187
[Gear (68)] created with speed: 432
[Gear (69)] created with speed: 472
[Gear (70)] created with speed: 899
[Gear (71)] created with speed: 325
[Gear (72)] created with speed: 615
[Gear (73)] created with speed: 315
[Gear (74)] created with speed: 425
[Gear (75)] created with speed: 441
[Gear (76)] created with speed: 679
[Gear (77)] created with speed: 125
[Gear (78)] created with speed: 706
[Gear (79)] created with speed: 455
[Gear (80)] created with speed: 15
[Gear (81)] created with speed: 155
[Gear (82)] created with speed: 669
[Gear (83)] created with speed: 590
[Gear (84)] created with speed: 457
[Gear (85)] created with speed: 574
[Gear (86)] created with speed: 1
[Gear (87)] created with speed: 472
[Gear (88)] created with speed: 763
[Gear (89)] created with speed: 329
[Gear (90)] created with speed: 385
[Gear (91)] created with speed: 176
[Gear (92)] created with speed: 674
[Gear (93)] created with speed: 528
[Gear (94)] created with speed: 702
[Gear (95)] created with speed: 328
[Gear (96)] created with speed: 82
[Gear (97)] created with speed: 833
[Gear (98)] created with speed: 101
[Gear (99)] created with speed: 950
[Controller] Send commands for syncing to gears!
[Controller] calculated syncSpeed: 504
[Controller] started all gears
[Gear (2)] has syncSpeed
[Gear (0)] has syncSpeed
[Gear (5)] has syncSpeed
[Gear (1)] has syncSpeed
[Gear (4)] has syncSpeed
[Gear (8)] has syncSpeed
[Gear (9)] has syncSpeed
[Gear (7)] has syncSpeed
[Gear (10)] has syncSpeed
[Gear (11)] has syncSpeed
[Gear (12)] has syncSpeed
[Gear (13)] has syncSpeed
[Gear (15)] has syncSpeed
[Gear (14)] has syncSpeed
[Gear (3)] has syncSpeed
[Gear (16)] has syncSpeed
[Gear (17)] has syncSpeed
[Gear (18)] has syncSpeed
[Gear (21)] has syncSpeed
[Gear (6)] has syncSpeed
[Gear (22)] has syncSpeed
[Gear (24)] has syncSpeed
[Gear (23)] has syncSpeed
[Gear (25)] has syncSpeed
[Gear (20)] has syncSpeed
[Gear (28)] has syncSpeed
[Gear (29)] has syncSpeed
[Gear (26)] has syncSpeed
[Gear (19)] has syncSpeed
[Gear (32)] has syncSpeed
[Gear (31)] has syncSpeed
[Gear (33)] has syncSpeed
[Gear (35)] has syncSpeed
[Gear (36)] has syncSpeed
[Gear (30)] has syncSpeed
[Gear (38)] has syncSpeed
[Gear (39)] has syncSpeed
[Gear (34)] has syncSpeed
[Gear (40)] has syncSpeed
[Gear (41)] has syncSpeed
[Gear (42)] has syncSpeed
[Gear (27)] has syncSpeed
[Gear (45)] has syncSpeed
[Gear (46)] has syncSpeed
[Gear (47)] has syncSpeed
[Gear (44)] has syncSpeed
[Gear (43)] has syncSpeed
[Gear (48)] has syncSpeed
[Gear (50)] has syncSpeed
[Gear (51)] has syncSpeed
[Gear (49)] has syncSpeed
[Gear (53)] has syncSpeed
[Gear (37)] has syncSpeed
[Gear (54)] has syncSpeed
[Gear (56)] has syncSpeed
[Gear (57)] has syncSpeed
[Gear (59)] has syncSpeed
[Gear (58)] has syncSpeed
[Gear (60)] has syncSpeed
[Gear (55)] has syncSpeed
[Gear (52)] has syncSpeed
[Gear (62)] has syncSpeed
[Gear (63)] has syncSpeed
[Gear (64)] has syncSpeed
[Gear (65)] has syncSpeed
[Gear (67)] has syncSpeed
[Gear (68)] has syncSpeed
[Gear (69)] has syncSpeed
[Gear (61)] has syncSpeed
[Gear (70)] has syncSpeed
[Gear (72)] has syncSpeed
[Gear (66)] has syncSpeed
[Gear (74)] has syncSpeed
[Gear (73)] has syncSpeed
[Gear (75)] has syncSpeed
[Gear (76)] has syncSpeed
[Gear (79)] has syncSpeed
[Gear (71)] has syncSpeed
[Gear (78)] has syncSpeed
[Gear (77)] has syncSpeed
[Gear (82)] has syncSpeed
[Gear (80)] has syncSpeed
[Gear (84)] has syncSpeed
[Gear (83)] has syncSpeed
[Gear (85)] has syncSpeed
[Gear (87)] has syncSpeed
[Gear (88)] has syncSpeed
[Gear (81)] has syncSpeed
[Gear (86)] has syncSpeed
[Gear (89)] has syncSpeed
[Gear (90)] has syncSpeed
[Gear (93)] has syncSpeed
[Gear (94)] has syncSpeed
[Gear (91)] has syncSpeed
[Gear (95)] has syncSpeed
[Gear (96)] has syncSpeed
[Gear (92)] has syncSpeed
[Gear (97)] has syncSpeed
[Controller] Syncspeed received by a gear (2)
[Controller] Syncspeed received by a gear (0)
[Controller] Syncspeed received by a gear (5)
[Controller] Syncspeed received by a gear (1)
[Controller] Syncspeed received by a gear (4)
[Controller] Syncspeed received by a gear (8)
[Controller] Syncspeed received by a gear (9)
[Controller] Syncspeed received by a gear (7)
[Controller] Syncspeed received by a gear (10)
[Controller] Syncspeed received by a gear (11)
[Controller] Syncspeed received by a gear (12)
[Controller] Syncspeed received by a gear (13)
[Controller] Syncspeed received by a gear (15)
[Controller] Syncspeed received by a gear (14)
[Controller] Syncspeed received by a gear (3)
[Controller] Syncspeed received by a gear (16)
[Controller] Syncspeed received by a gear (17)
[Controller] Syncspeed received by a gear (18)
[Controller] Syncspeed received by a gear (21)
[Controller] Syncspeed received by a gear (6)
[Controller] Syncspeed received by a gear (22)
[Controller] Syncspeed received by a gear (24)
[Controller] Syncspeed received by a gear (23)
[Controller] Syncspeed received by a gear (25)
[Controller] Syncspeed received by a gear (20)
[Controller] Syncspeed received by a gear (28)
[Controller] Syncspeed received by a gear (29)
[Controller] Syncspeed received by a gear (26)
[Controller] Syncspeed received by a gear (19)
[Controller] Syncspeed received by a gear (32)
[Controller] Syncspeed received by a gear (31)
[Controller] Syncspeed received by a gear (33)
[Controller] Syncspeed received by a gear (35)
[Controller] Syncspeed received by a gear (36)
[Controller] Syncspeed received by a gear (30)
[Controller] Syncspeed received by a gear (38)
[Controller] Syncspeed received by a gear (39)
[Controller] Syncspeed received by a gear (34)
[Controller] Syncspeed received by a gear (40)
[Controller] Syncspeed received by a gear (41)
[Controller] Syncspeed received by a gear (42)
[Controller] Syncspeed received by a gear (27)
[Gear (98)] has syncSpeed
[Gear (99)] has syncSpeed
[Controller] Syncspeed received by a gear (45)
[Controller] Syncspeed received by a gear (46)
[Controller] Syncspeed received by a gear (47)
[Controller] Syncspeed received by a gear (44)
[Controller] Syncspeed received by a gear (43)
[Controller] Syncspeed received by a gear (48)
[Controller] Syncspeed received by a gear (50)
[Controller] Syncspeed received by a gear (51)
[Controller] Syncspeed received by a gear (49)
[Controller] Syncspeed received by a gear (53)
[Controller] Syncspeed received by a gear (37)
[Controller] Syncspeed received by a gear (54)
[Controller] Syncspeed received by a gear (56)
[Controller] Syncspeed received by a gear (57)
[Controller] Syncspeed received by a gear (59)
[Controller] Syncspeed received by a gear (58)
[Controller] Syncspeed received by a gear (60)
[Controller] Syncspeed received by a gear (55)
[Controller] Syncspeed received by a gear (52)
[Controller] Syncspeed received by a gear (62)
[Controller] Syncspeed received by a gear (63)
[Controller] Syncspeed received by a gear (64)
[Controller] Syncspeed received by a gear (65)
[Controller] Syncspeed received by a gear (67)
[Controller] Syncspeed received by a gear (68)
[Controller] Syncspeed received by a gear (69)
[Controller] Syncspeed received by a gear (61)
[Controller] Syncspeed received by a gear (70)
[Controller] Syncspeed received by a gear (72)
[Controller] Syncspeed received by a gear (66)
[Controller] Syncspeed received by a gear (74)
[Controller] Syncspeed received by a gear (73)
[Controller] Syncspeed received by a gear (75)
[Controller] Syncspeed received by a gear (76)
[Controller] Syncspeed received by a gear (79)
[Controller] Syncspeed received by a gear (71)
[Controller] Syncspeed received by a gear (78)
[Controller] Syncspeed received by a gear (77)
[Controller] Syncspeed received by a gear (82)
[Controller] Syncspeed received by a gear (80)
[Controller] Syncspeed received by a gear (84)
[Controller] Syncspeed received by a gear (83)
[Controller] Syncspeed received by a gear (85)
[Controller] Syncspeed received by a gear (87)
[Controller] Syncspeed received by a gear (88)
[Controller] Syncspeed received by a gear (81)
[Controller] Syncspeed received by a gear (86)
[Controller] Syncspeed received by a gear (89)
[Controller] Syncspeed received by a gear (90)
[Controller] Syncspeed received by a gear (93)
[Controller] Syncspeed received by a gear (94)
[Controller] Syncspeed received by a gear (91)
[Controller] Syncspeed received by a gear (95)
[Controller] Syncspeed received by a gear (96)
[Controller] Syncspeed received by a gear (92)
[Controller] Syncspeed received by a gear (97)
[Controller] Syncspeed received by a gear (98)
[Controller] Syncspeed received by a gear (99)
[Controller] all gears are back in town!

    while(true) {
      receive {
        case StartSync => {

这将产生一个与2.7产生的结果非常相似的结果。

感谢Daniel提供的有用答案。我做了更改，我的代码在Scala 2.8中运行良好。我将为这个模拟做一个简单的Scala swing GUI，并将其发布到github上。