Question

For years a have heard that C++ is fast, so, it is good for image processing, by example.

If i am developing a system in C# that need to do some image processing and i want to improve your performance, whats the best aproach?

1 – Do it all in C# and do the image processing function embraced with “unmanaged”

2 – Write the function that process de image in C++ and import this function to my C# code?

Another questions?

Which one improves the performance?

Answer 1

Its a trade off between C++ to C# call and IL code to machine code generation.

1. C# generates IL code, which will be converted to machine code at run time. machine code generation will have some cost.
2. From C#, You can call C++ DLL’s method. Loading C++ method and calling that will have some cost.

Now you need to compare the cost of 1 & 2.