<div dir="ltr">Roland, I think you have been using such flags. Which flags exactly did you use?<div><br></div><div>-erik</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 10, 2015 at 1:45 PM, Frank Loeffler <span dir="ltr"><<a href="mailto:knarf@cct.lsu.edu" target="_blank">knarf@cct.lsu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Tue, Nov 10, 2015 at 01:38:08PM -0500, Jonah Miller wrote:<br>
> I am working on developing a modified stencil for the Einstein Toolkit<br>
> and I am discovering that regression tests pass when I use the GNU<br>
> compilers but fail when I use the Intel compilers, even with gentle<br>
> optimization settings such as -O1. I suspect over-zealous optimization.<br>
> Has anyone encountered this sort of problem before? And if so, does<br>
> anybody know a good combination of flags that makes the intel compiler<br>
> more cautious, without sacrificing too much speed? (For example,<br>
> disabling fast math, which seems to be set to active by default.)<br>
<br>
</span>The default for the Intel compiler is non-exact math. Try some of the<br>
options mentioned here:<br>
<br>
<a href="https://software.intel.com/en-us/articles/consistency-of-floating-point-results-using-the-intel-compiler" rel="noreferrer" target="_blank">https://software.intel.com/en-us/articles/consistency-of-floating-point-results-using-the-intel-compiler</a><br>
<br>
How much that influences effective speed likely depends a lot on your<br>
code.<br>
<span class="HOEnZb"><font color="#888888"><br>
Frank<br>
<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Erik Schnetter <<a href="mailto:schnetter@cct.lsu.edu" target="_blank">schnetter@cct.lsu.edu</a>><br><a href="http://www.perimeterinstitute.ca/personal/eschnetter/" target="_blank">http://www.perimeterinstitute.ca/personal/eschnetter/</a></div>
</div>