所谓的数据并行的条件是:
1、拥有大量的数据。
2、对数据的逻辑操作都是一致的。
3、数据之间没有顺序依赖。
运行并行编程可以充分的利用现在多核计算机的优势。记录代码如下:
public class ParallerFor { public List<string> studentList; public ParallerFor() { this.studentList = new List<string>(); for (int i = 0; i < 50; i++) { this.studentList.Add("xiaochun"+i.ToString()); } } public void ParallerTest() { var sw = Stopwatch.StartNew(); foreach (string str in this.studentList) { Console.WriteLine("this is sync "+str); Thread.Sleep(800); } Console.WriteLine("运行时间:"+sw.Elapsed.ToString()); } public void ParallerAsyncTest() { var sw = Stopwatch.StartNew(); Action<int> ac = (i) => { Console.WriteLine("this is async " + this.studentList[i]); Thread.Sleep(800); }; Parallel.For(0, this.studentList.Count,ac);//这里的0是指循环的起点 Console.WriteLine("运行时间:" + sw.Elapsed.ToString()); } public void ParallalForEachTest() { var sw = Stopwatch.StartNew(); Action<string> ac = (str) => { int num = int.Parse(str.Replace("xiaochun",string.Empty)); if (num > 10) { Console.WriteLine(str); Thread.Sleep(1000); } }; //限定最大并行数目 ParallelOptions op = new ParallelOptions(); op.MaxDegreeOfParallelism = 4; Parallel.ForEach(this.studentList,op,ac); //这里没有限定最大并行数目 //Parallel.ForEach(this.studentList,ac); } }