Question

I have a structure (class) that keeps very large number of numbers (either float, double, int, byte) in an array.

Now I want to have very high performance approach to apply some primitive operations (Add/Subtract/Divide/Multiply with a constant) on this array.

This arrays is on a continuous piece of memory so for example for copying it I am using Buffer.BlockCopy.

But what about adding a constant or multiplying with a constant?

The first choice is to walk through the array using pointers. What other approaches do you suggest for this?

Answer 1

Using pointer (unsafe) is not certain to be more performant.

Why don’t you start with a normal for(int index = 0; index < data.Lenght; index++) loop and see if it meets your requirements.

---

And of course, the next step would be processing in parallel :

 Parallel.For(0, data.Length, i => data[i] *= myFactor);