On Fri, Mar 24, 2017 at 8:43 AM, Eloisa Bentivegna < eloisa.bentivegna@ct.infn.it> wrote:
Hi all,
still on the KNL topic, I realize there was a question I ignored, and which perhaps is worth pursuing.
On 01/03/17 21:43, Ian Hinder wrote:
Eloisa: does Carpet report the vector size of the KNL as 8? From the wikipedia entry, I would expect that to be the case, but I think you mentioned to me that it was reporting 4.
That's correct. In my output I find:
=============================================================== INFO (Vectors): Using vector size 4 for architecture AVX (64-bit precision) ===============================================================
Is this not supposed to be so? And in this case, is there anything I can do about it?
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".
-erik
Eloisa, are you using LoopControl?
Yes.
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