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Roadrunner Supercomputer using 12,960 CELL Processors Hits 1 PetaFlop(1000 TeraFlops) of double-precision FP Performance



 
 
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  #21  
Old June 13th 08, 01:23 PM posted to comp.sys.super,comp.arch,alt.comp.hardware.amd.x86-64,comp.sys.ibm.pc.hardware.chips,alt.games.video.sony-playstation3
Robert Redelmeier
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Posts: 316
Default Roadrunner Supercomputer using 12,960 CELL Processors Hits 1 PetaFlop ?(1000 TeraFlops) of double-precision FP Performance

In comp.sys.ibm.pc.hardware.chips Cydrome Leader wrote in part:
I find it unlikely they still don't know how nuclear weapons
work, especially considering they're mature technology and
they've been around for decades.


A two-stage thermonuclear warhead is a surprisingly complex
device -- look up Teller-Ulam. To work properly, the design has to
transfer enough light energy to ignite and burn the fusion secondary
before the fission primary shock waves disassemble the device.
There's _lots_ to simulate here in at least 2D over many timeslices.

Yes, we know how to make them go bang. Just follow the recipe.
But we don't always know the critical parts of that recipe, and
what parts we could change.

In general, the whole field of Finite-Element computation is
still short of cycles and can swallow everything available.
Multi-CPU clusters are still being built. Imagine being able
to simulate vehicle collisions -- designers would be able
to determine where metal could be added or other changes to
improve occupant survival.

-- Robert


  #22  
Old June 13th 08, 04:10 PM posted to comp.sys.super,comp.arch,alt.comp.hardware.amd.x86-64,comp.sys.ibm.pc.hardware.chips,alt.games.video.sony-playstation3
Terje Mathisen
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Posts: 39
Default Roadrunner Supercomputer using 12,960 CELL Processors Hits 1PetaFlop ?(1000 TeraFlops) of double-precision FP Performance

Robert Redelmeier wrote:
Multi-CPU clusters are still being built. Imagine being able
to simulate vehicle collisions -- designers would be able
to determine where metal could be added or other changes to
improve occupant survival.


No need to imagine this:

We have operated a Linux cluster for nearly 5 years now that Hydro (the
Aluminium company) uses to simulate the energy transfer/structure
deformation that happens when a (sports) car using one of their
aluminium frames with integrated "crash box" structures get into an
accident.

Yes, it is a _lot_ cheaper than running real crash tests, even though
you still have to verify the theoretical results before the car will be
certified for road use.

Terje

--
-
"almost all programming can be viewed as an exercise in caching"
  #23  
Old June 13th 08, 05:45 PM posted to comp.sys.super,comp.arch,alt.comp.hardware.amd.x86-64,comp.sys.ibm.pc.hardware.chips,alt.games.video.sony-playstation3
Robert Myers
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Posts: 606
Default Roadrunner Supercomputer using 12,960 CELL Processors Hits 1PetaFlop ?(1000 TeraFlops) of double-precision FP Performance

On Jun 13, 11:10 am, Terje Mathisen
wrote:


Yes, it is a _lot_ cheaper than running real crash tests, even though
you still have to verify the theoretical results before the car will be
certified for road use.


Cost isn't the real advantage. You can't instrument an experiment the
way that you can a simulation.

The disadvantage, of course, is that you have mountains of information
and sometimes no clue as to what to do with it. The science, the
insight, the talent, and everything else worthwhile are in finding
those clues and not in the petaflops or exabytes.

Robert.
 




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