<div dir="ltr"><div>Thank you very much again.<br><br></div>Best regards.<br></div><div class="gmail_extra"><br><div class="gmail_quote">2016-11-08 18:27 GMT+01:00 Paolo Giannozzi <span dir="ltr"><<a href="mailto:p.giannozzi@gmail.com" target="_blank">p.giannozzi@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>The number of H\psi products, as well as the number of scf iterations, is not directly related to the size of the systems, but larger systems are often more difficult to converge than smaller ones, and there may be significant differences between "nasty" and "easy" systems.<span class="HOEnZb"><font color="#888888"><br><br></font></span></div><span class="HOEnZb"><font color="#888888">Paolo<br></font></span></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 8, 2016 at 4:07 PM, Pablo García Risueño <span dir="ltr"><<a href="mailto:garcia.risueno@gmail.com" target="_blank">garcia.risueno@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"><div>Thank you very much again, this help is very useful. In this point I wonder if the (<i>N</i><sub>h</sub> := number of <i>H</i><img src="http://www.quantum-espresso.org/wp-content/uploads/Doc/pw_user_guide/img5.png" alt="$ \psi$" height="35" width="17" border="0" align="MIDDLE"> products needed by iterative diagonalization) depends on the size of the system, or it is more or less constant for different kinds of systems.<br><br></div>Best regards<br></div><div class="gmail_extra"><br><div class="gmail_quote">2016-11-08 12:58 GMT+01:00 Paolo Giannozzi <span dir="ltr"><<a href="mailto:p.giannozzi@gmail.com" target="_blank">p.giannozzi@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>There is no similar page for the phonon code, but there is this remark:<br>"<i>For phonon calculations, each of the
3N<sub>at</sub> modes requires a time of the same order of magnitude of
self-consistent calculation in the same system (possibly times a small multiple)." </i>More accurate estimates depend a lot upon details of the calculation that are not easy to predict (such as how quickly the system converges)<span class="m_-1269735592905782822m_-2613298540778751273HOEnZb"><font color="#888888"><br><br></font></span></div><span class="m_-1269735592905782822m_-2613298540778751273HOEnZb"><font color="#888888">Paolo<br></font></span></div><div class="m_-1269735592905782822m_-2613298540778751273HOEnZb"><div class="m_-1269735592905782822m_-2613298540778751273h5"><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 8, 2016 at 12:18 PM, Pablo García Risueño <span dir="ltr"><<a href="mailto:garcia.risueno@gmail.com" target="_blank">garcia.risueno@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"><div>Thank you very much, prof. Giannozzi, that is what I was looking for. Do you know if a similar page exists for the ph.x code?<br><br></div>Best regards <br></div><div class="gmail_extra"><br><div class="gmail_quote">2016-11-08 11:38 GMT+01:00 Paolo Giannozzi <span dir="ltr"><<a href="mailto:p.giannozzi@gmail.com" target="_blank">p.giannozzi@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>You can find something here:<br><a href="http://www.quantum-espresso.org/wp-content/uploads/Doc/pw_user_guide/node14.html" target="_blank">http://www.quantum-espresso.or<wbr>g/wp-content/uploads/Doc/pw_us<wbr>er_guide/node14.html</a><br><br></div>Paolo<br></div><div class="gmail_extra"><div><div class="m_-1269735592905782822m_-2613298540778751273m_-6260222271985822494m_2026046458998483436h5"><br><div class="gmail_quote">On Tue, Nov 8, 2016 at 11:29 AM, Pablo García Risueño <span dir="ltr"><<a href="mailto:garcia.risueno@gmail.com" target="_blank">garcia.risueno@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"><div>Dear Federico<br><br></div>Thank you very much for your message. Unfortunately these tests seem to measure the computing time as a function of the number of cores, and not as a function of the number of electrons//plane waves//etc.<br><br><br></div><div class="m_-1269735592905782822m_-2613298540778751273m_-6260222271985822494m_2026046458998483436m_-4390803768368173779HOEnZb"><div class="m_-1269735592905782822m_-2613298540778751273m_-6260222271985822494m_2026046458998483436m_-4390803768368173779h5"><div class="gmail_extra"><br><div class="gmail_quote">2016-11-08 11:09 GMT+01:00 Federico Iori <span dir="ltr"><<a href="mailto:federico.iori@u-psud.fr" target="_blank">federico.iori@u-psud.fr</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:arial,helvetica,sans-serif;font-size:12pt;color:#000000"><div>Hi Pablo.<br></div><div><br></div><div>Did you have a look at computational centers benchmark test?<br></div><div><br></div><div>I can suggest you <br></div><div><a href="http://www.quantum-espresso.org/benchmarks/" target="_blank">http://www.quantum-espresso.or<wbr>g/benchmarks/</a></div><div><br></div><div><a href="http://www.hpc.cineca.it/content/quantumespresso-benchmark" target="_blank">www.hpc.cineca.it/content/quan<wbr>tumespresso-benchmark</a></div><div><br></div><div>I am not sure they can provide all the info you are looking for regarding scaling vs all the parameters of th system thou, but maybe they can help somehow.<br></div><div><br></div><div><span name="x"></span><table class="m_-1269735592905782822m_-2613298540778751273m_-6260222271985822494m_2026046458998483436m_-4390803768368173779m_1694126785007622343m_-8033577101675615213mceItemTable"><tbody><tr><td><img alt="Université Paris-Sud" src="https://zimbra.u-psud.fr/public/z_logo_signature.png"></td><td valign="top"><div><span style="font-size:10pt"><b>Federico IORI</b></span></div><div><span style="font-size:10pt">Marie Curie Fellow<br>Laboratoire de Physique des Solides<br>Bâtiment 510 - Rue André Rivière<br>91400 Orsay</span></div></td></tr></tbody></table><div><br></div><span name="x"></span><br></div><hr id="m_-1269735592905782822m_-2613298540778751273m_-6260222271985822494m_2026046458998483436m_-4390803768368173779m_1694126785007622343m_-8033577101675615213zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt"><b>De: </b>"Pablo García Risueño" <<a href="mailto:garcia.risueno@gmail.com" target="_blank">garcia.risueno@gmail.com</a>><br><b>Para: </b>"PWSCF Forum" <<a href="mailto:pw_forum@pwscf.org" target="_blank">pw_forum@pwscf.org</a>><br><b>Enviados: </b>Martes, 8 de Noviembre 2016 10:50:10<br><b>Asunto: </b>[Pw_forum] Question on scaling of Quantum Espresso<div><div class="m_-1269735592905782822m_-2613298540778751273m_-6260222271985822494m_2026046458998483436m_-4390803768368173779m_1694126785007622343h5"><br><div><br></div><div dir="ltr"><div><div>Dear members of the Espresso community<br><div><br></div></div>I would like to know how the total execution time of Quantum Espresso (pw.x and ph.x) scales with the different parameters of the system, like number of electrons, size of the box, ecutwfc, etc. It would be very useful for me to know in which parameters the scaling is linear, quadratic or cubic. Of course I can do tests on my own, but they would be just partly reliable due to Amdahl's issues.<br><div><br></div></div>Thank you very much for your help. Best regards.<br clear="all"><div><div><div><br>-- <br><div class="m_-1269735592905782822m_-2613298540778751273m_-6260222271985822494m_2026046458998483436m_-4390803768368173779m_1694126785007622343m_-8033577101675615213gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">--<br><div><br></div>Dr. Pablo García Risueño<br><div><br></div>Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, 20146 Hamburg<br><div><br></div>Tel. +49 040 42 83 84 82 7</div></div></div></div></div></div>
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