<div dir="ltr"><div><div><div><div><div>Hello,<br></div><span id="result_box" class="" lang="en"><span class="">of course</span><span>,</span> <span>but</span> <span>this job</span> <span>make</span> <span>the operating system</span> <span>of</span> <span>your PC (Linux, Unix)</span><span>.</span><br><span class="">We need it</span> <span>because</span> <span>the</span> <span></span></span><span id="result_box" class="" lang="en"><span lang="EN-US">HyperThreading</span> <span>used</span> one <span>arithmetic unit</span> <span>and</span> <span>two logical</span> <span>units</span> <span>in each</span> <span>core</span> of the <span class="">processor</span><span class="">.</span> <br><span class="">When</span> <span>running</span> <span>the</span> WRF<span></span> m<span>ost</span> <span>of the calculations of the program</span> <span>is</span> <span>not</span> the <span>numerical</span> <span>but</span> the logical<span class="">.</span><br><span>In practice</span> <span>the</span> </span><span id="result_box" class="" lang="en"><span lang="EN-US">HyperThreading</span> <span>has</span> <span>double </span><span></span></span><span id="result_box" class="" lang="en"><span>performance.<br><br></span></span></div><span id="result_box" class="" lang="en"><span>In Centos OS (Linux)<br></span></span></div><span id="result_box" class="" lang="en"><span>if i used the top command i see something like this<br><br>...<br><br> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND <br>11828 user1 20 0 8860 1192 844 R 786 50.0 10:00.02 wrf<br><br>...<br><br></span></span></div><span id="result_box" class="" lang="en"><span>which mean that the WRF in a 4 core machine </span></span><span id="result_box" class="" lang="en"><span><span id="result_box" class="" lang="en"><span lang="EN-US">with HyperThreading </span></span>used the ~786% (800% max) of the power and not 400%.<br></span></span></div><span id="result_box" class="" lang="en"><span>Again, this job make automatic the linux or Unix and of course we enable the -omp option in the makefiles of WRF.<br><br><br></span></span><div><div><span id="result_box" class="" lang="en"><span>Efstathios Konstantinos Mironakis<br><a href="http://www.forecastmaps.eu">http://www.forecastmaps.eu</a><br><br></span></span><div><div><span id="result_box" class="" lang="en"><span><br></span></span></div></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-03-21 21:49 GMT+02:00 Julio Castro <span dir="ltr"><<a href="mailto:jcastro@gac.cl" target="_blank">jcastro@gac.cl</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div link="blue" vlink="purple" lang="ES-CL"><div><p class="MsoNormal"><span lang="EN-US">Dear Users,<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Question, use or not use HyperThreading when running WRF on a single machine?<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Many thanks<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><table style="border-collapse:collapse" align="left" border="0" cellpadding="0" cellspacing="0"><tbody><tr style="height:11.3pt"><td colspan="2" style="width:414.25pt;padding:0in 5.4pt 0in 5.4pt;height:11.3pt" valign="top" width="552"><p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#0068b3">Julio Castro M.</span></b><u></u><u></u></p><p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Verdana","sans-serif";color:#0068b3">Ingeniero Civil, MSc., PhD.</span><span style="color:black"><u></u><u></u></span></p></td></tr><tr style="height:11.3pt"><td colspan="2" style="width:414.25pt;padding:0in 5.4pt 0in 5.4pt;height:11.3pt" valign="top" width="552"><p class="MsoNormal" 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style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#0068b3">www.gac.cl</span></a></span><span style="color:black"><u></u><u></u></span></p></td></tr></tbody></table><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p></div></div><br>_______________________________________________<br>
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