<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m interested to try to run some of the standard benchmarks for Quantum Espresso (<a href="http://qe-forge.org/gf/project/q-e/frs/?action=FrsReleaseBrowse&frs_package_id=36">http://qe-forge.org/gf/project/q-e/frs/?action=FrsReleaseBrowse&frs_package_id=36</a> ) on Xeon Phi, particularly the pwscf-small, GRIR443 and AUSURF112 benchmarks. My background is in HPC, so I only have quite basic knowledge of the QE scientific domain.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I haven’t been able to find any information on anyone having run QE on Xeon Phi before on the mailing list or elsewhere, does anyone know of any results for QE on Xeon Phi?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For a start, in trying to run QE natively on a single coprocessor (i.e. all processes/threads within a single Xeon Phi coprocessor), could you suggest some good parallelisation strategies to try out? For example what balance of MPI vs Explicit OpenMP vs Library (MKL) OpenMP and what application specific parallelisation parameters (e.g. -nimage, -npools, -nband, -ntg, -northo or –ndiag)?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The Phi has 60 hardware cores with up to 4 way SMT on each core (and a requirement to use at least 2 of 4 SMT threads per core in order to utilise the hardware fully, as each core will only issue at most an instruction for a single SMT thread every second clock) – therefore it is necessary to use at least 120 (if not 180/240) way concurrency for a single Xeon Phi based run.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best Regards,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Paul.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#00B050;mso-fareast-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#00B050;mso-fareast-language:EN-GB'>---<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#00B050;mso-fareast-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#00B050;mso-fareast-language:EN-GB'>Paul Caheny<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#00B050;mso-fareast-language:EN-GB'>Researcher<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#00B050;mso-fareast-language:EN-GB'>Technical Computing Research<br>Fujitsu Laboratories of Europe Ltd (FLE)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#00B050;mso-fareast-language:EN-GB'>phone: +44 (0) 20 8606 4529<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#00B050;mso-fareast-language:EN-GB'>e-mail: <a href="mailto:Paul.Caheny@uk.fujitsu.com"><span style='color:#00B050'>Paul.Caheny@uk.fujitsu.com</span></a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#00B050;mso-fareast-language:EN-GB'>web: <a href="http://www.fujitsu.com/emea/about/fle" target="_blank"><span style='color:#00B050'>http://www.fujitsu.com/emea/about/fle/</span></a><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>
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