<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 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:14.0pt'>Dear All,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>This is Ravi Kannan from CFD Research Corporation. We have been using PETSc as the main driver for our computational suites for the last decade. Recently there has been a surge in the multicore type architectures for scientific computing. I have a few questions in this regard:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>1. Does PETSc’s communication use the MPI which is installed on the host machine? In other words, do the transfers performed by PETSC use exactly the MPI installed on the host machine?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>2. How does PETSc handle the data transfer for inside the processor (between cores) for multicore architectures?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Ravi.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'>_________________________________________<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'>Dr. Ravi Kannan<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'>Associate Editor of Scientific Journals International<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'><a href="http://www.stmjournals.com/index.php?journal=JoAET&page=about&op=editorialTeam"><span style='color:blue'>Editorial Board, Journal of Aerospace Engineering and Technology</span></a> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'>Who’s Who in Thermal Fluids<span style='color:#1F497D'> (<a href="https://www.thermalfluidscentral.org/who/browse-entry.php?e=9560"><span style='color:blue'>https://www.thermalfluidscentral.org/who/browse-entry.php?e=9560</span></a>)<o:p></o:p></span></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'>Research Engineer, CFD Research Corporation<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'>256.726.4851<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'><a href="mailto:rdt@cfdrc.com"><span style='color:blue'>rxk@cfdrc.com</span></a> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'>http://ravikannan.jimdo.com/ , <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'><a href="https://www.msu.edu/~kannanra/homepage.html"><span style='color:blue'>https://www.msu.edu/~kannanra/homepage.html</span></a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Courier New"'>_________________________________________<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>