comparison of icc and gcc

[newport_j]

I wrote, compiled and ran a simulation program both using icc and gcc. The output was not the same, but it was very close most of the time.

In a few case in the program's output, the difference between gcc and icc compiler was great. This was a small amount of time - a rare event. But still it was noticeable.

Should I be concerned or is this SOP?

Newport_j

[Brandon_H_Intel]

I assume the difference is coming from floating point calculations? If so, I recommend the following article:

http://software.intel.com/en-us/articles/consistency-of-floating-point-results-using-the-intel-compiler/

which does a good job of explaining your options for dealing with floating-point.