Are doubles faster than floats in C#?

Question

I\'m writing an application which reads large arrays of floats and performs some simple operations with them. I\'m using floats, because I thought it\'d be faster than doubl

Answer 1

Matthijs,

You are wrong. 32-bit is far more efficient than 16-bit - in modern processors... Perhaps not memory-wise, but in effectiveness 32-bit is the way to go.

You really should update your professor to something more "up-to-date". ;)

Anyway, to answer the question; float and double has exactly the same performance, at least on my Intel i7 870 (as in theory).

Here are my measurements:

(I made an "algorithm" that I repeated for 10,000,000 times, and then repeated that for 300 times, and out of that I made a average.)

double
-----------------------------
1 core  = 990 ms
4 cores = 340 ms
6 cores = 282 ms
8 cores = 250 ms

float
-----------------------------
1 core  = 992 ms
4 cores = 340 ms
6 cores = 282 ms
8 cores = 250 ms