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<p>This is my source for those theoretical numbers: <br>
</p>
<p><a class="moz-txt-link-freetext" href="http://dewaele.org/~robbe/thesis/writing/references/49747D_HPC_Processor_Comparison_v3_July2012.pdf">http://dewaele.org/~robbe/thesis/writing/references/49747D_HPC_Processor_Comparison_v3_July2012.pdf</a></p>
<p>If those numbers are off, that makes my job a bit easier. And it
looks like you're right. In the text above the table, it does
mention 2-socket servers, and then below the table in fine print,
it states <br>
</p>
<p>"For AMD Opteron Processors, theoretical FLOPS = Core Count x
Core Frequency x number of processors per server x 4."</p>
<p>Why can't the table just show single socket performance?
Grrrr.... <br>
</p>
<p>Regardless of bad marketing and graphics design, I'm still at at
square one. My system has 2 sockets, and the best I've been able
to do is get ~115 GFLOPS. And that's one of the 'instaneous'
values LINPACK spits out every few seconds. At the end of test,
the actual GFLOPS result is more like 77 GLOPS: <br>
</p>
<p>===========================================<br>
T/V N NB P Q
Time Gflops<br>
--------------------------------------------------------------------------------<br>
WR00L2L2 82775 40 4 8
4924.71 7.678e+01</p>
<p>This is a two socket system, so that's only 27% of theoretical
max. <br>
</p>
<pre class="moz-signature" cols="72">Prentice </pre>
<div class="moz-cite-prefix">On 02/22/2018 01:18 PM, Dmitri Chubarov
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CANe5L+Syv7DT+p0jrgN=YqMb0qn3adiSrdAWQqTp3Fz9Mz3wrQ@mail.gmail.com">
<div dir="ltr">
<div>
<div>
<div>
<div>
<div>Hi,<br>
<br>
</div>
not sure if the 282 GFLOPS number is correct.<br>
<br>
</div>
We have 16 Bulldozer/Interlagos cores at 2.2 GHz. Each
pair of cores forms a CMT module. The two cores in the
module share an FPU with 2 128-bit FMAC units. <br>
<br>
In terms of double precision FLOPS it should make<br>
</div>
16 * 2.2GHz * 2 double precision scalars/SIMD register * 2
FLOPS / FMA op = 140.8 GFLOPS<br>
<br>
</div>
It looks like 282 GFLOPS number is per a 2P node.<br>
<br>
</div>
Dima<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 22 February 2018 at 21:37, Prentice
Bisbal <span dir="ltr"><<a href="mailto:pbisbal@pppl.gov"
target="_blank" moz-do-not-send="true">pbisbal@pppl.gov</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Beowulfers,<br>
<br>
In your experience, how close does actual performance of
your processors match up to their theoretical performance?
I'm investigating a performances issue on some of my nodes.
These are older systems using AMD Opteron 6274 processors. I
found literature from AMD stating the theoretical
performance of these processors is 282 GFLOPS, and my
LINPACK performance isn't coming close to that (I get
approximately ~33% of that). The number I often hear
mentioned is actual performance should be ~85%. of
theoretical performance is that a realistic number your
experience?<br>
<br>
I don't want this to be a discussion of what could be wrong
at this point, we will get to that in future posts, I assure
you!<span class="HOEnZb"><font color="#888888"><br>
<br>
-- <br>
Prentice<br>
<br>
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</div>
<br>
</div>
</blockquote>
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