<div dir="ltr">Hi Daniel,<div><br></div><div>Thanks for spotting that - it's now fixed in <a href="https://gerrit.gromacs.org/#/c/6568/">https://gerrit.gromacs.org/#/c/6568/</a> .</div><div><br></div><div>Cheers,</div><div><br></div><div>Erik</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Apr 1, 2017 at 7:36 AM, Daniel Tameling <span dir="ltr"><<a href="mailto:tamelingdaniel@gmail.com" target="_blank">tamelingdaniel@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear all,<div><br></div><div>I recently built GROMACS 2016.1 for the Skylake architecture.</div><div>How<font face="arial, helvetica, sans-serif">ever, the executable </font>crashed when I trid to run it.</div><div>The reason for this was that the code was compiled with -xMIC-AVX512, which generates AVX512 instructions for the Knights Landing architecture, which are partly incompatible with the AVX512 instruction set for Skylakes.</div><div><br></div><div>The reason for this compiler flag to be used is the following code in cmake/gmxManageSimd.cmake</div><div><br></div><div><pre style="font-family:consolas,menlo,"liberation mono",courier,monospace;margin-top:0px;margin-bottom:0px;white-space:pre-wrap;font-size:12px;color:rgb(51,51,51);background-color:rgb(250,250,250)">elseif(GMX_SIMD STREQUAL "AVX_512")</pre><pre style="font-family:consolas,menlo,"liberation mono",courier,monospace;margin-top:0px;margin-bottom:0px;white-space:pre-wrap;font-size:12px;color:rgb(51,51,51);background-color:rgb(250,250,250)"> ...</pre><pre style="font-family:consolas,menlo,"liberation mono",courier,monospace;margin-top:0px;margin-bottom:0px;white-space:pre-wrap;font-size:12px;color:rgb(51,51,51);background-color:rgb(250,250,250)"> "-xMIC-AVX512" "-mavx512f -mfma" "-mavx512f" "/arch:AVX" "-hgnu") # no AVX_512F flags known for MSVC yet</pre><pre style="font-family:consolas,menlo,"liberation mono",courier,monospace;margin-top:0px;margin-bottom:0px;white-space:pre-wrap;font-size:12px;color:rgb(51,51,51);background-color:rgb(250,250,250)"><br></pre><pre style="margin-top:0px;margin-bottom:0px;white-space:pre-wrap;font-size:12px;color:rgb(51,51,51);background-color:rgb(250,250,250)"><font face="arial, helvetica, sans-serif">I checked the GROMACS repository, and this code seems still to be present.</font></pre><pre style="margin-top:0px;margin-bottom:0px;white-space:pre-wrap;font-size:12px;color:rgb(51,51,51);background-color:rgb(250,250,250)"><font face="arial, helvetica, sans-serif">To generate correct code for Skylakes, the -xMIC-AVX512 should be replaced by -xCORE-AVX512.</font></pre><pre style="margin-top:0px;margin-bottom:0px;white-space:pre-wrap;font-size:12px;color:rgb(51,51,51);background-color:rgb(250,250,250)"><font face="arial, helvetica, sans-serif"><br></font></pre><pre style="margin-top:0px;margin-bottom:0px;white-space:pre-wrap;font-size:12px;color:rgb(51,51,51);background-color:rgb(250,250,250)"><font face="arial, helvetica, sans-serif">Best regards,</font></pre><pre style="margin-top:0px;margin-bottom:0px;white-space:pre-wrap;font-size:12px;color:rgb(51,51,51);background-color:rgb(250,250,250)"><font face="arial, helvetica, sans-serif">Daniel</font></pre></div></div>
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