Domain: npaci.edu
Stories and comments across the archive that link to npaci.edu.
Comments · 13
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Galactic colission simulationshttp://www.npaci.edu/online/v4.9/galaxies2.html
for what it's worth, here's a simulation of Our milky way hitting Andromeda.
Things like this happen all the time. -
Darknets, Honeynets, BlackNetThe term "Darknet" used for pirated content distribution appears in a Microsoft Paper. The term appears to be appropriated from Tim May's Blacknet gedankenexperiment on uses of private communications and digital cash. A few magazine pundits have adopted it, but the term doesn't appear to be in wide use even among pundits.
The Cymru Darknet is something entirely different, and it's not a honeynet either. Honeynets are nice sticky traps waiting to snare actively attacking crackers. This Darknet is primarily a passive monitoring system, and while it will see some active attacks such as port scans, another interesting thing it sees is backscatter from forged traffic, like CAIDA's System is tracking. Many DOS attacks use spoofed packets from random addresses, such as ICMP or SYN floods, and the victims or some routers will send TCP ACKs or ICMP responses back to the (forged) source, and some proportional fraction of that will end up in your darknet's detectors. It won't catch all such attacks - ISPs that want to be good citizens run the RFC2267 / RFC2827 best practices like uRPF spoof-proofing, which prevent their customers from forging packets except from the forger's own subnet address space, so you won't see those, but they're usually much less of a problem because they're easier to block, trace, and shut down. (Some of the cracker tools out there have built-in options to only forge within your
/24 for just this reason.) -
Rocks Cluster Distribution
I like the Rocks Cluster Distribution. It is above all simple to use, well documented, and stable.
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Re:Tera Multithreaded computer
In Tera's case, the goal was to mask the latency of a totally shared uniformed memory. The CPUs were completly cache-less. Their approach was really extreme. It seems they also did a blunder by betting on gallium arsenide, in the words of one of my university professors, a technology that has been the future for the past 25 years
;-)
So what had to happen happened.
Still, Teras were really cool machines. Sigh... -
Andromeda Will Hit Us Before Then
In a mere 3 billion years, the Andromeda galaxy will slam into the Milky way. Ouch, and possibly curtains for life on Earth.
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TeraGrid at SC2001TeraGrid will be present at SC2001 (a yearly conference and expo for supercomputing and high-performance networking). Just to give you a hint of what it is like, the showfloor will have more than 10Gb/s of total outgoing Internet capacity (plus more private/non-IP circuits).
If you're going to be in Denver the week of Nov 12, 2001, consider stopping by. If nothing else, the place will have free and open 802.11b!
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Not just NCSAThe title on this article is a bit misleading. As the press release says, NCSA is just one of the four institutions involved in this project. The others are SDSC, Argonne National Laboratory, and Caltech's CACR (Center for Advanced Computing Research).
NCSA is certainly an important part of this partnership, but they're neither the only part nor the lead site.
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in related news
there is a much larger cluster of linux machines going to be created care of the NSF. press release here. good day for linux!
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A typical example from last week headlines...
Actually, if you remember this story, you might be interested to view the 110-million particles simulations in details on such a big display...
But well, they'll have to process very-high-res movies, first, which might be much more expensive in terms of supercomputing power.
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Re:Speculation
"...Jupiter's Winds: Vortex Pancakes versus Taylor Columns:
Marcus P. (and others), UC Berkeley."
http://www.npaci.edu/enVision/v1 4.1 /marcus.html -
Re:Sieze the power.We could have the first community-owned supercomputer. Imagine the possibilities...
Well this is kind of a good idea, but you will be happy to know that it has already been done.
The US government spends millions of dollars on supercomputers every year. Some of the computers are for Classified projects, but many of them are for research purposes. These research computers are like a national computing resource. You paid the tax money for them and, if you're so inclined, you can probably use them. If you think you have a project that would benefit from a supercomputer, you can apply for time on one.
If you buy your own Cray you'll be guaranteed time on it, but you'll also be burdened with maintenance and upgrades.
Try these links:
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Some PointersI do research into how to use statistical and AI techniques to predict resource demand and availability in distributed systems. You might be interested in looking at some of my thesis related papers, systems, and databases.
Another project that is interested in performance prediction is the Network Weather Service (NWS). An important issue in systems such as RPS (my system) and NWS is accurate and scalable measurement of hosts and networks. Remos is able to do this.
A lot of work in this area is taking place in the context of Computational Grids. The Grid Forum is an IETF-like body that is trying to standardize Grid middleware systems. Globus and Legion are examples of Grid middleware systems.
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Re:Playstation2 Woes
Actually modern supercomputers (see Blue Horizon) run at over a TFLOP. They gain this performance from fast superscalar CPUs, not a bunch of vector processors. This means they will run nearly all (parallel) software fast, not just 4d vector stuff.
You are mistaken about the frame rate. It is 60Hz, not 3600Hz. Also, you do see each one of those frames (actually fields) right after it's drawn on the next VBlank. And lighting does take some effort on the part of the vector units which is one reason terrain does not usually have realtime lighting, it is lit in the tools (not counting FX lighting like missles lighting up halls, etc, which is usually done on the CPU anyways).
I agree with you on the power of the PS2. Current CPUs do not have floating point vector units which are what give the PS2 its awesome floating point performance specs. (But these are special processors that really only accelerate 3d calculations.)
Let me say that I really dig the PS2 (I have a TOOL). It's an extremely powerfull graphics machine and I think some groundbreaking games will become possible with it.