<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Jan<div><br><div><div>On Feb 29, 2008, at 2:48 PM, Jan Ploski wrote:</div><blockquote type="cite"><font class="Apple-style-span" color="#000000"><br class="webkit-block-placeholder"></font></blockquote><blockquote type="cite">This page may be helpful:<br><br><a href="https://bi.offis.de/wisent/tiki-index.php?page=WRF-gFortran">https://bi.offis.de/wisent/tiki-index.php?page=WRF-gFortran</a><br><br></blockquote><div><br class="webkit-block-placeholder"></div><div>Great! Thanks so much!</div><br><blockquote type="cite">However, note that I've had some significant differences in the output <br>between gfortran and PGI, so be careful to check the results after you've <br>built the code. I think g75 is officially supported (may be better), but <br>don't know about OpenMP in it. Based on my experience, the OpenMP version <br>of WRF seems to scale up poorly compared to MPI. For example:<br><br></blockquote><blockquote type="cite"><a href="https://srvgrid01.offis.uni-oldenburg.de/wrf-benchmark/case.pl?case=conus12km_2001">https://srvgrid01.offis.uni-oldenburg.de/wrf-benchmark/case.pl?case=conus12km_2001</a><br></blockquote></div><div apple-content-edited="true"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br class="webkit-block-placeholder"></div><div>Very interesting benchmark, I will keep it in mind. </div><div>Since MPI seems to perform better, are you aware of different MPI implementations performance with WRF? Supposing I can use MPICH, LAM/MPI or OpenMPI (I'm not sure if I can do this), is there a recommended one?</div><div><br class="webkit-block-placeholder"></div><div>Thanks again</div><div><br class="webkit-block-placeholder"></div><div>d</div><div><br class="webkit-block-placeholder"></div><div>--</div><div>Davide Cittaro</div><div><a href="mailto:daweonline@gmail.com">daweonline@gmail.com</a></div><div><a href="http://www.daweonline.net">http://www.daweonline.net</a></div></div></span></div></span> </div><br></div></body></html>