<div dir="ltr"><div><div><div><div><div><div>Hi,<br><span id="result_box" class="" lang="en"><span>it seems</span> <span>that the</span> <span>Intel</span> <span>continues</span> <span>its old</span> <span>tactics</span> <span>of marketing</span><span>.</span><br><span>To</span> <span>see how</span> <span>we come out</span> <span>of</span> <span>this trap</span><span>!</span><br><span>We go back</span> <span class="">some</span> <span>years</span>.<br><span>Look here</span><span>:</span></span><br><br>#Cores #Chips #Processor #Result #year #price<br>4 1 Intel i7-860 121 2010 274,08 €<br>4 1 Intel i7-870 127 2010 538,46 €<br>4 1 Intel i7-920 109 2010 266,78 €<br>6 1 Intel i7-980X 168 2010 1.013,47 €<br>8 2 Intel E5520 200 2010 369,88 € x2 <br>8 2 Intel E5420 109 2010 295,84 € x2<br><br></div>Lets say that the i7-860 run WRF test case in 1 hour.<br></div>there is not difference in time with i7-870 which cost double price !!! and it has a biggest cache .. bla bla bla ...<br></div><br>Another trap<br></div>i7-980X (X = 6 core) is faster 50% than i7-860 but its cost 4x !!!<br></div>if a have a cluster with four i7-860 its give 4x121=484 ~ 150% faster than i7-980X !!!<br><br></div><div>Another trap<br></div><div>Lets see Xeon, the E5520 has a double performance than E5420.<br></div><div>The configuration of two E5420 has a double price than i7-860 and its slower.<br>Β<span id="result_box" class="" lang="en"><span class="">e careful.</span></span><br><br></div><div>Another trap<br></div><div>To buy or rent a PC?<br></div><div><span id="result_box" class="" lang="en"><span class="">It depends</span></span>, if i am a government or a person !!!<br></div><div>Difficult decision.<br></div><div><br></div>So open an excel file, find the possessors with same results and take or rent the cheapest !!!<br><br><a href="http://www.cpubenchmark.net/high_end_cpus.html">http://www.cpubenchmark.net/high_end_cpus.html</a><br><br><br>Efstathios Konstantinos Mironakis<br><a href="http://www.forecastmaps.eu">http://www.forecastmaps.eu</a><br><br><br></div><div class="gmail_extra"><br><div class="gmail_quote">2016-02-26 21:47 GMT+02:00 Zulauf, Michael <span dir="ltr"><<a href="mailto:Michael.Zulauf@iberdrolaren.com" target="_blank">Michael.Zulauf@iberdrolaren.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hi all...<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">We’re looking to upgrade our computational cluster, whose primary purpose is to run WRF, and I’m in the process of writing up the specs. We’ll almost definitely stay with our current type of architecture (HP blades, infiniband interconnect,
etc).<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Our current blades are dual Xeon x5670 (each CPU has 6 cores, 2.93 GHz, 12 MB cache), and we’ll probably go with dual Xeon E5s of some flavor. Here are a few of the candidates:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Xeon E5-2640v3<u></u><u></u></p>
<p class="MsoNormal" style="text-indent:.5in">8 cores<u></u><u></u></p>
<p class="MsoNormal"> 2.6GHz<u></u><u></u></p>
<p class="MsoNormal"> 20 MB cache<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Xeon E5-2660v3<u></u><u></u></p>
<p class="MsoNormal" style="text-indent:.5in">10 cores<u></u><u></u></p>
<p class="MsoNormal"> 2.6GHz<u></u><u></u></p>
<p class="MsoNormal"> 25 MB cache<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Xeon E5-2680v3<u></u><u></u></p>
<p class="MsoNormal" style="text-indent:.5in">12 cores<u></u><u></u></p>
<p class="MsoNormal"> 2.5GHz<u></u><u></u></p>
<p class="MsoNormal"> 30 MB cache<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Leaving aside cost (for now), anyone have recommendations on these, or other similar processors? When we went thru this several years ago, there didn’t appear to be too much benefit with going with the processors that had the highest number
of cores. I think the additional cores seemed to run significantly less efficiently (at least in the case of WRF).<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Has that changed? The processors with more cores are substantially more expensive (and may be clocked slightly lower), but if WRF runs well on them then it might be worth shelling out the money (not my money) to get more cores. I probably
can’t justify buying more blades, even if I go with cheaper CPUs, so if the E5-2680v3 (for example) runs significantly better than the others, I could probably justify them.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thoughts?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal">Mike<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">-- <u></u><u></u></p>
<p class="MsoNormal">Mike Zulauf<u></u><u></u></p>
<p class="MsoNormal">Meteorologist, Lead Senior<u></u><u></u></p>
<p class="MsoNormal">Operational Meteorology <u></u><u></u></p>
<p class="MsoNormal">Iberdrola Renewables<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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