[Beowulf] China to eclipse Titan with 48,000 Intel MICs?

Prentice Bisbal prentice.bisbal at rutgers.edu
Thu Jun 6 07:14:58 PDT 2013

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.

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.

Hopefully someone from ALCF, OLCF, XSEDE or some other large HPC center 
can chime in with more detailed information.


On 06/05/2013 11:48 PM, Nathan Moore wrote:
> 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.
> Am I far off the mark?
> Along similar lines, has Google or Amazon ever published their batch 
> job capacity (it must be in petaflops...)
> NT
> On Tue, Jun 4, 2013 at 12:36 AM, Lux, Jim (337C) 
> <james.p.lux at jpl.nasa.gov <mailto:james.p.lux at jpl.nasa.gov>> wrote:
>     And on SlashDot
>     http://tech.slashdot.org/story/13/06/03/1231256/full-details-uncovered-on-chinese-tianhe-2-supercomputer
>     If you want to read a lot of comments from people who don't really
>     know HPC
>     From: Nathan Moore <ntmoore at gmail.com <mailto:ntmoore at gmail.com>>
>     Date: Monday, June 3, 2013 9:55 AM
>     To: Christopher Samuel <samuel at unimelb.edu.au
>     <mailto:samuel at unimelb.edu.au>>, "beowulf at beowulf.org
>     <mailto:beowulf at beowulf.org>" <beowulf at beowulf.org
>     <mailto:beowulf at beowulf.org>>
>     Subject: Re: [Beowulf] China to eclipse Titan with 48,000 Intel MICs?
>     Congratulations on making the world's largest space-heater...
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