On Tue, Nov 10, 2015 at 01:38:08PM -0500, Jonah Miller wrote: > I am working on developing a modified stencil for the Einstein Toolkit > and I am discovering that regression tests pass when I use the GNU > compilers but fail when I use the Intel compilers, even with gentle > optimization settings such as -O1. I suspect over-zealous optimization. > Has anyone encountered this sort of problem before? And if so, does > anybody know a good combination of flags that makes the intel compiler > more cautious, without sacrificing too much speed? (For example, > disabling fast math, which seems to be set to active by default.)
The default for the Intel compiler is non-exact math. Try some of the options mentioned here: https://software.intel.com/en-us/articles/consistency-of-floating-point-results-using-the-intel-compiler How much that influences effective speed likely depends a lot on your code. Frank
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