Question

I have a huge amount of data(permutation of the characters a-z,0-9) that needs to be processed by a method(ReturnId). But this takes a long time, so I would like to split the input and feed into the same method multiple times.

I guess I should work with threads but I don´t know how the separate the input properly.

    static void Main(string[] args)
    {
        string characters = "abcdefghijklmnopqrstuvwxyz0123456789";

        List<string> combinations = new List<string>();
        List<int> Id = new List<int>();

        combinations = Permutations(characters, 3); //Method that creats all the permutations up to 3 characters

     foreach (var item in combinations)
        {
            Id.Add(ReturnId(item)); // Methode that takes the string and search based on that string on a website for an id.
        }
}

}

Answer 1

使用Parallel.ForEach根据环境系统在多个线程上安排工作。系统上的处理器越多，并行方法运行的速度就越快。：

Parallel.ForEach(combinations, (item) =>
{
    Id.Add(ReturnId(item)); 
});

您还可以使用ParallelOptions定义最大并行度：

Parallel.ForEach(combinations, new ParallelOptions { MaxDegreeOfParallelism = 10 }, (item) =>
{
    Id.Add(ReturnId(item)); 
});

有关更多信息，请阅读here。

Answer 2

i'm guessing you want something like

public IEnumerable<string> Permutations(IEnumerable<string> characters ,int length,int current = 1)
{
    return current >= length 
         ? characters
         : from c in characters.AsParallel()
           from e in Permutations(characters, length, current+1)
           select c + e;
}

note this is not tested code and is provided as a guideline only

Seperate Workload

2 个答案: