C# How copy multiple files in multiple thread to speed up the copy process

Question

I heard that if i use multiple thread to copy multiple files from one pc to another pc it does not speed up. tell me which approach i should follow to copy files parallel which would be faster in speed?

should i use RoboCopy ? i heard i am not sure RoboCopy can help to copy multiples files from pc to another pc very faster. so please advise.
i found there is .Net wrapper of RoboCopy called RoboSharp https://github.com/tjscience/RoboSharp
should i use it ?

should i follow this approach https://forums.asp.net/t/1552575.aspx?Copy+file+s+from+source+folder+to+destination+using+Multi+Threading

Answer 1

If you just want to use RoboCopy in your code, the following code should be enough:

  private static void DirectoryCopy1(string sourceDirName, string destDirName,string fileName)  
        {  
            using (Process p = new Process())  
            {  
                p.StartInfo.Arguments = string.Format("/C ROBOCOPY {0} {1} {2}",  
                        sourceDirName, destDirName, fileName);  
                p.StartInfo.FileName = "CMD.EXE";  
                p.StartInfo.UseShellExecute = false;  
                p.Start();  
            }  
        }  

If you want to copy the entire folder and all subfolders, the third parameter can be passed "/e".
I used this method to compare with the method in the second link you provided, but the speed of the two methods is almost the same.
However, I still recommend that you use RoboCopy. In the actual copying process, we may have to consider many factors.
RoboCopy provides solutions for many situations, such as "/z", which means that restartable mode is enabled, which can restart after copying fails. This may be useful during network transmission.

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Answer 2

Copy with multiple thread won't make you do it faster.

Even the old SATA standard can transfer data faster(150MB/s, with SATA III you can get up to 600MB/s) than your Gigabit network(theoretical limit at about 123MB/s, and this assumes your source and destination machines are the only thing on network so no other network activity consumes your bandwidth). The bottleneck is on the network, not I/O to disks.