多线程
优点:
在于可以提高CPU的利用率——任何一个程序员都不希望自己的程序很多时候没事可干,在多线程程序中,一个线程必须等待的时候,CPU可以运行其它的线程而不是等待,这样就大大提高了程序的效率。
缺点:
线程也是程序,所以线程需要占用内存,线程越多占用内存也越多
多线程需要协调和管理,所以需要CPU时间跟踪线程
线程之间对共享资源的访问会相互影响,必须解决竞用共享资源的问题
线程太多会导致控制太复杂,最终可能造成很多Bug
ThreadPool.SetMaxThreads方法
设置线程池中同步可以活动的线程的最大数量. 所以超过这个数据的其它线程,必须等待其它线程完成后方可激活。
You cannot set the number of worker threads or the number of I/O completion threads to a number smaller than the number of processors in the computer.
例子原代码下载
Example
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Sample Output
launching 10 tasks...
result calculated...
result calculated...
result calculated...
result calculated...
result calculated...
result calculated...
result calculated...
result calculated...
result calculated...
result calculated...
all calculations complete
Fibonacci(22) = 17711
Fibonacci(25) = 75025
Fibonacci(32) = 2178309
Fibonacci(36) = 14930352
Fibonacci(32) = 2178309
Fibonacci(26) = 121393
Fibonacci(35) = 9227465
Fibonacci(23) = 28657
Fibonacci(39) = 63245986
Fibonacci(22) = 17711
详见于MSDN http://msdn.microsoft.com/en-us/library/3dasc8as(VS.80).aspx