Scala中可以启动多少个演员？ [英] How many actors can be launched in scala?

问题描述

我尝试过此代码

import scala.actors.Actor

class MyActor(val id:Int) extends Actor {
    def act() {
        println (" ****************** starting actor: " + id)

        while (true) {
            Thread.sleep(1000);
            println ("I'm actor " + id)
        }
    }
}

object Main {
    def main(args:Array[String]) {
        val N = 5
        for (i leftArrow 1 to N) {
            val a = new MyActor(i)
            println (" ++++++++++ about to start actor " + a.id)
            a.start
        }

        println (N + " actors launched?")
    }
}

并获得此输出

++++++++++ about to start actor 1
 ++++++++++ about to start actor 2
 ++++++++++ about to start actor 3
 ++++++++++ about to start actor 4
 ++++++++++ about to start actor 5
5 actors launched?
 ****************** starting actor: 1
 ****************** starting actor: 4
 ****************** starting actor: 3
 ****************** starting actor: 2
I'm actor 4
I'm actor 3
I'm actor 1
I'm actor 2
I'm actor 4

那么，我想念的是实际上只有四个演员在开始吗？
是否取决于我的计算机？一些配置？我应该以其他方式开始
演员吗？

So, what I'm missing that only four actors are actually being started? Does it depend on my computer? Some configuration? Should I start actors in a different way? Is it because I'm running that code inside netbeans?

非常感谢！

推荐答案

我认为这与scala的演员池有关。可能（我还在等我的书 Scala中的Actor）创建了一个包含四个线程的池（也许与您的四个核心CPU有关），并将您的actor分配给了它们。问题是，您使用了 Thread.sleep 。这吸引了某个线程，并绕过scala的actor进行线程分配。

I think it has to do with scala´s actor pool. It probably (I am still waiting on my book "Actors in Scala") creates a pool with four threads (perhaps related to your four core CPU) and assigns your actors to them. The problem is, that you use Thread.sleep. That appeals to a certain thread and bypasses scala´s actor to thread assignment.

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