<div dir="ltr">On Fri, Mar 24, 2017 at 8:43 AM, Eloisa Bentivegna <span dir="ltr"><<a href="mailto:eloisa.bentivegna@ct.infn.it" target="_blank">eloisa.bentivegna@ct.infn.it</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Hi all,<br>
<br>
still on the KNL topic, I realize there was a question I ignored, and<br>
which perhaps is worth pursuing.<br>
<span class="gmail-"><br>
On 01/03/17 21:43, Ian Hinder wrote:<br>
> Eloisa: does Carpet report the vector size of the KNL as 8? From the<br>
> wikipedia entry, I would expect that to be the case, but I think you<br>
> mentioned to me that it was reporting 4.<br>
<br>
</span>That's correct. In my output I find:<br>
<br>
==============================<wbr>==============================<wbr>===<br>
INFO (Vectors): Using vector size 4 for architecture AVX (64-bit precision)<br>
==============================<wbr>==============================<wbr>===<br>
<br>
Is this not supposed to be so? And in this case, is there anything I can<br>
do about it?<br></blockquote><div><br></div><div>You should see a vector size of 8, and a message containing "AVX512 (64-bit precision)". If you do not do this, then there is a problem with the compiler options -- this decision is made at compile time. You might need to specify "-march=knl" to GCC, or a similar option to the Intel compiler, or you could build on a KNL node and use "-march=native" or "-xHost".</div><div><br></div><div>-erik</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><span class="gmail-">> Eloisa, are you using LoopControl?<br>
<br>
</span>Yes.<br>
<div class="gmail-HOEnZb"><div class="gmail-h5"><br>
Eloisa<br>
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</div></div></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></div>