<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>Dear Jose,</span></div><div><br><span></span></div><div><span>I think the best is you use a performance checking tool coming with your computer. For example PAPI or <br></span></div><div><span>CrayPat (on your lbl machine: http://www.nersc.gov/users/software/debugging-and-profiling/craypat/). You need to access hardware counters for getting the flops; this is not a software feature.</span><span> Counting flops is so last century, though, and nobody talks about this these days. I am usually just interested in getting the shortest possible walltime for a given problem I want to solve with my Uschi evolution code in the Cactus framework. </span></div><div><br></div><div>Uschi</div><div><br></div><div>----------------</div><div>Uschi T. Gamma</div><div>Assistant to the SC, TAPIR, Caltech<br></div><div><br></div>
<div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Jose Fiestas Iquira <jafiestas@lbl.gov><br> <b><span style="font-weight: bold;">To:</span></b> Ian Hinder <ian.hinder@aei.mpg.de>; users@einsteintoolkit.org <br> <b><span style="font-weight: bold;">Sent:</span></b> Monday, March 26, 2012 8:58 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [Users] cactus performance<br> </font> </div> <br>
<meta http-equiv="x-dns-prefetch-control" content="off"><div id="yiv1513534256">Hello,<div><br><div>Thanks for the information. I had a look at the benchmarks and profiling links on the Cactus website, and would like to find out the way to calculate Flops performed by a Cactus application. Are they some numbers published? In one of the papers you sent to me I found timings of McLachlan (which is my application), but I could not find Flops per simulation.</div>
<div><br></div><div>It seems to me I could be able to run my application using .par-files prepared for benchmarking? Please correct me if I am wrong.</div><div><br></div><div>My goal is to have an idea of the Flops expected by McLachlan runs on larger machines (few thousands or cores).</div>
<div><br></div><div>Thanks,</div><div>Jose<br><br></div><div><br><div class="yiv1513534256gmail_quote">2012/3/21 Frank Loeffler <span dir="ltr"><<a rel="nofollow" ymailto="mailto:knarf@cct.lsu.edu" target="_blank" href="mailto:knarf@cct.lsu.edu">knarf@cct.lsu.edu</a>></span><br><blockquote class="yiv1513534256gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="yiv1513534256im">On Wed, Mar 21, 2012 at 01:15:05PM +0100, Ian Hinder wrote:<br>
> Frank, do you know what the following links have changed into?<br>
><br>
> http://www.cct.lsu.edu/xirel/<br>
> http://www.cct.lsu.edu/CCT-TR/CCT-TR-2008-5<br>
<br>
</div>Good question, I made an inquiry.<br>
<span class="yiv1513534256HOEnZb"><font color="#888888"><br>
Frank<br>
<br>
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<br></blockquote></div><br></div></div>
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