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<div class="moz-cite-prefix">You're not completely off the mark, but
you are a bit off. Speaking from what I know of the national HPC
resources in the US (ALCF, OLCF, XSEDE), to get on the largest
systems you usually have to go through an application process that
shows your programs can scale well enough to use these large
supercomputers, and the schedulers are usually configured to give
preference to larger jobs. <br>
<br>
So while it might be true that these systems are seldom used to
run a single job across every single node and processor, efforts
are made to keep out the poseurs and reward those who do use large
portions of the cluster for a single job. In other words, I think
your off by a matter of degree. I think a "small" job on systems
like this is probably a few thousand or tens of thousands of
cores. <br>
<br>
Hopefully someone from ALCF, OLCF, XSEDE or some other large HPC
center can chime in with more detailed information. <br>
<br>
Prentice<br>
<br>
<br>
<br>
On 06/05/2013 11:48 PM, Nathan Moore wrote:<br>
</div>
<blockquote
cite="mid:CACD67swUjP-a4BUdhwj3LBc-VQsbX=B05bA2Gj7iA-tCOQaR4A@mail.gmail.com"
type="cite">I didn't mean any special insult to the latest top 500
entry. Rather, that was a comment on the general nature of that
list. Does anyone know, off-hand, how often these big machines
run with all compute nodes dedicated to a single message-passing
job? My guess is less than 1% of the time, and for the most part
these machines are used as batch servers for smaller (N=512, 64,
32, etc) Amber/Gaussian/CFD like jobs.
<div>
<div><br>
</div>
<div>Am I far off the mark?</div>
<div><br>
</div>
<div>Along similar lines, has Google or Amazon ever published
their batch job capacity (it must be in petaflops...)<br>
</div>
<div><br>
</div>
<div>NT<br>
<br>
<div class="gmail_quote">
On Tue, Jun 4, 2013 at 12:36 AM, Lux, Jim (337C) <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:james.p.lux@jpl.nasa.gov" target="_blank">james.p.lux@jpl.nasa.gov</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div
style="font-size:14px;font-family:Calibri,sans-serif;word-wrap:break-word">
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<div>
<div>And on SlashDot</div>
<div><a moz-do-not-send="true"
href="http://tech.slashdot.org/story/13/06/03/1231256/full-details-uncovered-on-chinese-tianhe-2-supercomputer"
target="_blank">http://tech.slashdot.org/story/13/06/03/1231256/full-details-uncovered-on-chinese-tianhe-2-supercomputer</a></div>
<div><br>
</div>
<div>If you want to read a lot of comments from
people who don't really know HPC</div>
<div>
<div>
<p class="MsoNormal"
style="margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"> </p>
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<span>
<div style="border-right:medium
none;padding-right:0in;padding-left:0in;padding-top:3pt;text-align:left;font-size:11pt;border-bottom:medium
none;font-family:Calibri;border-top:#b5c4df 1pt
solid;padding-bottom:0in;border-left:medium none">
<span style="font-weight:bold">From: </span>Nathan
Moore <<a moz-do-not-send="true"
href="mailto:ntmoore@gmail.com" target="_blank">ntmoore@gmail.com</a>><br>
<span style="font-weight:bold">Date: </span>Monday,
June 3, 2013 9:55 AM<br>
<span style="font-weight:bold">To: </span>Christopher
Samuel <<a moz-do-not-send="true"
href="mailto:samuel@unimelb.edu.au"
target="_blank">samuel@unimelb.edu.au</a>>, "<a
moz-do-not-send="true"
href="mailto:beowulf@beowulf.org" target="_blank">beowulf@beowulf.org</a>"
<<a moz-do-not-send="true"
href="mailto:beowulf@beowulf.org" target="_blank">beowulf@beowulf.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re:
[Beowulf] China to eclipse Titan with 48,000 Intel
MICs?<br>
</div>
<div>
<div class="h5">
<div><br>
</div>
<div>
<div>Congratulations on making the world's
largest space-heater...
<div><br>
<br>
</div>
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</div>
</div>
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</span></div>
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