how to make a multithread copy files

Question

I want to copy many files in one, but using multiThread,supposing that file A is the file in which different threads copy datas, in this case each thread is meant to copy one fi

Answer 1

It's perfectly possible to copy files using multiple threads. You would typically use a single producer thread and multiple consumers to do the work. In your case you are concatenating. So you'd need to work out the start and end point of each source file, and then get the threads to write separate parts of the destination file at the pre-calculated positions. Certainly possible.

However, it's not a good idea idea. Multiple threading works well when the job is CPU bound. File copying is disk bound and no amount of extra threads can help. In fact you will likely end up making performance worse because the multiple threads will just get in each others way whilst fighting over the shared disk resource.