试了一下.Net Fx 4.0中的Parallel

ゝ一世哀愁。 2022-03-29 04:42 118阅读 0赞

![None.gif][]  static  string \[\] arr  =  Directory.GetFiles(  
![None.gif][] @" C:\\Users\\Public\\Pictures\\Sample Pictures " ,  
![None.gif][] " \*.jpg " );  
![None.gif][]  
![None.gif][] // 这里Spin的数值最好自行modify一下,我的是Q6600的机子    
![ExpandedBlockStart.gif][]![ContractedBlock.gif][]  static  void  SimulateProcessing()  ![dot.gif][] \{ Thread.SpinWait(1000000000); \}   
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] static  string  TID  ![dot.gif][] \{ get![dot.gif][]\{ return" TID = "\+ Thread.CurrentThread.Mana  
![ExpandedBlockEnd.gif][]gedThreadId.ToString(); \} \}   
![None.gif][] static  void  Main( string \[\] args)  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]//foreach (string name in arr)  
![InBlock.gif][]//\{  
![InBlock.gif][]// Program.SimulateProcessing();  
![InBlock.gif][]// Console.WriteLine(name + TID);  
![InBlock.gif][]//\}  
![InBlock.gif][]  
![InBlock.gif][] Parallel.ForEach(arr, (string name) =>  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][] Program.SimulateProcessing();  
![InBlock.gif][] Console.WriteLine(name \+ TID);  
![ExpandedSubBlockEnd.gif][] \});  
![InBlock.gif][] Console.ReadLine();  
![ExpandedBlockEnd.gif][] \}   
![None.gif][]

采用并行的Foreach效果的确很明显.不仅仅是指派了多个线程,对cpu的利用率也高很多，  
见下面两图比较:  
原来的foraech:  
[![wopforech.png][]][wopforech.png]  
使用parallel的foreach:  
[![wpforeach.jpg][]][wpforeach.jpg]  
  
有兴趣的朋友可以对parallel相应的类库做一下逆向工程分析一下it的原理;-)

[None.gif]: /images/20220329/a2a46cc744964ba7a2d986eea92fdbfa.png
[ExpandedBlockStart.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif
[ContractedBlock.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif
[dot.gif]: /images/20220329/a299479378304ae39b3db9b819152f77.png
[ExpandedBlockEnd.gif]: /images/20220329/3cf815c2be044a65984b626ad6587201.png
[InBlock.gif]: /images/20220329/397d554f298f4afc8b11e600b16a951c.png
[ExpandedSubBlockStart.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif
[ContractedSubBlock.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif
[ExpandedSubBlockEnd.gif]: /images/20220329/87002b425bfa4992be109c1b4e2c7412.png
[wopforech.png]: http://newhost.byhh.net/f/DotNet/1258209228/wopforech.png
[wpforeach.jpg]: http://newhost.byhh.net/f/DotNet/1258209239/wpforeach.jpg