I need to compare the contents of very large files. Speed of the program is important. I need 100% match.I read a lot of information but did not find the optimal solution. I have two choices and everyone has problems.

1. Compare whole file byte by byte - not fast enough for large files.
2. File Comparison using Hashes - not 100% match the two files with the same hash.

What do you suggest? Maybe I can do something with threads? MemoryMappedFile - can be helpful?

I need to compare the contents of very large files. Speed of the program is important. I need 100% match.I read a lot of information but did not find the optimal solution. I am haveconsidering two choices and both problems.

1. Compare whole file byte by byte - not fast enough for large files.
2. File Comparison using Hashes - not 100% match the two files with the same hash.

What would you suggest? Maybe I could make use of threads? Could MemoryMappedFile be helpful?