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Cool/Weird Stuff To Do On a Cluster?

Gori writes "I'm a researcher at a university. Our group mainly does Agent Based Modeling of interdisciplinary problems (think massive simulations where technology, policy, and economics meet). Recently, we managed to get a bunch of money for a High Performance Cluster to run our stuff on. The code is mostly written in Java. Our IT support people are very capable of setting up a stable cluster that will run Java perfectly. But where's the fun in that? What I'm trying to figure out are other, more far-out and interesting things to do with this machine — think 500+ Opteron cores, 2 GB RAM per core, a gigabit interconnect with some badass switches, a massive storage array, plus a bunch of UltraSPARC boxes. So at times when there's no stuff to crunch, I'd like to boot the thing up with a 'weird' system image and geek around in the name of science. Try fancy ways of building models, dynamically adding all sorts of hardware to it, etc. Have different schedulers compete for resources. Imagine a Matlab vs. Boinc vs. ProActive shootout. Maybe run plan9 on it? Most of us are not CE/CS people, but we are geeky enough. So, what would be the coolest and most far out thing you would do with this kind of hardware ?"

52 of 608 comments (clear)

  1. How about you don't? by Anonymous Coward · · Score: 5, Insightful

    And save the environment a little bit?

    1. Re:How about you don't? by mrbluze · · Score: 5, Funny

      That is one of the sanest postings I've come across on slashdot. So why is it marked as a troll? Jealousy.
      --
      Do it yourself, because no one else will do it yourself. [beta blockade 10-17 Feb]
    2. Re:How about you don't? by Anonymous Coward · · Score: 4, Funny

      >> And save the environment a little bit?
      >
      >That is one of the sanest postings I've come across on slashdot. So why is it marked as a troll?

      Hippies are the worst kinds of trolls.

    3. Re:How about you don't? by TeknoHog · · Score: 5, Interesting

      You could always run Climateprediction.net.

      --
      Escher was the first MC and Giger invented the HR department.
    4. Re:How about you don't? by otacon · · Score: 5, Funny

      I would have to agree with you sir. Nothing pisses me off more than hippies.

      --
      In a world of acronyms, the words are the real victims.
    5. Re:How about you don't? by rubycodez · · Score: 5, Insightful

      because it won't make one iota of difference to the environment whether that thing is on or off, your one of those token bullshit symbolism over substance wanks. That's as stupid as advocating abolishing drag racing to save gasoline.

    6. Re:How about you don't? by spun · · Score: 4, Funny

      Cartman? Is that you?

      --
      - None can love freedom heartily, but good men; the rest love not freedom, but license. -- John Milton
    7. Re:How about you don't? by tubapro12 · · Score: 4, Funny

      They could try running Crysis?

    8. Re:How about you don't? by Anonymous Coward · · Score: 4, Funny

      Hippies aren't REALLY trolls, they just smell like them!

    9. Re:How about you don't? by Gori · · Score: 4, Interesting

      Actually, we are designing a sophisticated monitoring and control system that will power down all the nodes that have nothing to do. Sustainability is *the* reason why we build models in the first place. Most of them are used to estimate CO2 emissions of different future industrial systems.. so yeas, you are right, this is an important issue...

      --
      Complexity is a measure of our ignorance...
    10. Re:How about you don't? by aarner · · Score: 4, Insightful

      "because it won't make one iota of difference to the environment whether that thing is on or off..."

      assuming it's 500 cores, and also assuming (conservatively) that the diffrence between idle and full load is only 100 watts per processing unit - that means about 50 extra KWh consumed by this thing at near full utilization.

      X 24 hours = about 1.2 million watts.

      1 short ton of coal yields about 2500 KWh of electricity at average efficiencies.

      If I've done the math right, you can imagine dumping an extra 1/2 ton of coal on a fire somewhere to run this thing (at load) for 1 day.

      According to DOE - Burning coal produces 2.117 lbs of carbon per KWh. So even 1 hour at full load introduces an additional 50 pounds of CO2 into the atmosphere

      Again, all assuming this cluster sits somewhere (like america) where most of the electricity gets generated from coal or other fossil fuels. YMMV.

      Important to remember - there isn't any storage or margin in the power grid. Every time turn on a light switch or run a CPU up to max with SuperPrime, somewhere a turbine starts turning that little bit faster - it's always got to be nearly in balance.
       

  2. Not far out but.. by shaunol · · Score: 5, Interesting

    I'd be interested to see how quickly you could fold@home@work on that cluster.

  3. Vista? by Aggrajag · · Score: 5, Funny

    I think that would be an ideal setup to run Vista on. I heard that with SP1 you might only need half of the equipment you currently have.

    1. Re:Vista? by bobbozzo · · Score: 5, Funny

      Obviously, it should be used to find The Ultimate Question.

      --
      Nothing to see here; Move along.
    2. Re:Vista? by Crimson+Wing · · Score: 4, Insightful

      I think that would be an ideal setup to run Vista on. I heard that with SP1 you might only need half of the equipment you currently have. The Vista-needs-uber-comp jokes are getting extremely old. Get some new material.
      --
      Sig? What's that? Oh, 'signature'...and it's supposed to be witty? Right...
    3. Re:Vista? by RiotingPacifist · · Score: 4, Funny

      Program a strong AI and then ask it if entropy can be reduced.

      --
      IranAir Flight 655 never forget!
    4. Re:Vista? by somersault · · Score: 4, Insightful

      You should maybe hide your signature when you say things like that.

      Itg is widely accepted that Vista is a waste of resources, and therefore all articles about powerful computer resources are going to have Vista jokes. You can't kill off a meme on your own. If you don't like repetetive humour then perhaps you should change your moderation to mod down all funny comments.

      Anyway, slightly back on topic - I think they'd want to keep it a cluster rather than degenerate into a clusterfuck, so it may be better to avoid installing Vista.

      --
      which is totally what she said
  4. You can hope by JesseL · · Score: 4, Funny

    that it will be fast enough to run Duke Nukem Forever when it gets released.

    --
    "Prefiero morir de pie que vivir siempre arrodillado!"
    1. Re:You can hope by Anonymous Coward · · Score: 4, Interesting

      Although that was the easiest meme, It gave me an idea. Perhaps you could try some very-very-very high resolution ray tracing. I hear that such a process scales well with parallelism.

      side note: captcha = shading

  5. Coolest? by Vectronic · · Score: 5, Insightful

    "So, what would be the coolest and most far out thing you would do with this kind of hardware?"

    Instead of pissing around with stuff that may not go anywhere other than a few giggles over lunch.

    Why not just rent, or lend it out to people who don't have the funding or equipment that could use this cluster for a better purpose than "playing around"?

    Just saying...

    1. Re:Coolest? by gad_zuki! · · Score: 5, Insightful

      Its incredible a university would let this kind of equipment go to waste. If people arent clamoring to run things then you either have a non-existent (or terrible) CS department or too much money that should have gone elsewhere.

      Regardless, there are tons of grid clients out there. There's always something to run.

    2. Re:Coolest? by A+Unique+Nick+Name · · Score: 4, Interesting

      I fully agree. I'm the admin on a similar sized cluster (although our interconnects are much faster) that sees only about 50% utilization by the University. The rest of the time is lent out to other Universities without such a resource or need a place to run unfunded projects. I'd be amazed that such a resource would ever be allowed to be "played" on. Our up time is critical since many jobs take weeks sometimes months to run. Every effort is made to make the system rock solid and divide up the resources fairly.

    3. Re:Coolest? by baggins2001 · · Score: 5, Interesting

      I saw about $1,000,000 of hardware go to waste because they didn't budget maintenance for the system. We couldn't even fire it up to see what worked anymore. System barely ran for a year.
      Started me rethinking my Doctorate plans in CS. If this pool of PhD's couldn't figure out that you were going to need to maintain the systems and have a number of people to work on it, then what the hell, book learnin didn't get them very far.
      I'm sure though, that their thought was that once they got it in that surely the Administration would budget for maintenance.
      This was an SGI system about 6 years ago.

      --
      He who said 1,000,000 monkeys on 1,000,000 typewriters would eventually type the great novel, never saw an AOL chat room
    4. Re:Coolest? by nick_davison · · Score: 5, Insightful

      Its incredible a university would let this kind of equipment go to waste. You're not from the education world, are you.

      Let me see if I can help explain...

      Money comes in to education through grants. Grants are usually awarded to whoever can make the best case. You'll notice I didn't say "deserving" or "beneficial to mankind" case. The best case is often the one that's written by someone who knows how to game the system be it through politics or releasing sensationalist research that may not prove anything much to anyone.

      Publishing articles are kinda nice. Publishing books is usefull for a little extra income from screwing your students who have to buy the latest version you update each year. Having the media pick up your research because you just claimed women are smarter than men and the secret to cold fusion powered cars that also run on water is far, far better.

      Once you have this money, it's yours to do with as you wish. Just one thing. Don't ever, ever let it be seen that you didn't really need it. If that happens, how much budget do you think the university is going to give you on the years where your grant applications fail? How about those you beg for money from, next time? If you got money to buy a supercomputer, you need it, 24/7, until you declare it's obsolete. If you don't, they might ask why a pretty-nifty-computer wouldn't have worked just as well. And so, for that reason, no one else gets time on it. Hell, you might only need it because it turns out it's the perfect sized doorstop for a door you had... but let anyone think you don't need it and you're screwed in the magical world of academia.

      It's in conflict with the notion of academia being "for the good of mankind" but no more so than the notion of government being "for the people." Both simply serve the people within it... researchers or politicians. The rest is set dressing to ensure others keep paying for it.

  6. How about a game? by Niel143 · · Score: 5, Funny

    Chess
    Poker
    Fighter Combat
    Guerrilla Engagement
    Desert Warefare
    Air-to-Ground Actions
    Theaterwide Tactical Warfare
    Theaterwide Biotoxic and Chemical Warfare


    Global Thermonuclear War

    ??

  7. Super photogenesis by Stevenovitch · · Score: 5, Funny

    Write a program that creates every possible 255x255px bitmap possible, and then right an algorithm to go through and figure out which ones are rubbish and which ones are actually recognizable pictures.

    Logic dictates that one of the resulting pictures would have to be of John Lennon kicking George W Bush in the nuts, find that picture and post it on failblog.

    Voila.

    1. Re:Super photogenesis by Stevenovitch · · Score: 5, Funny

      Honestly, we should both be banned for this travesty... you more so than me.

    2. Re:Super photogenesis by Anonymous Coward · · Score: 5, Funny

      1. Create every possible mp3 upto 5 minutes long.
      2. Sue the record companies for every song they release from that point on.
      3. Profit.

    3. Re:Super photogenesis by NotBornYesterday · · Score: 4, Interesting

      Okay. Swinging, wild-ass guess - (color depth)^(bitmap size) = total number of possible pictures. So a 255^2 bitmap @ 16 bit color (~65k colors) = 3.551938486e+312970 possible pictures. You'd better by all the world's disk storage. Creating all them wouldn't be a problem. Sifting through them would take forever.

      Interesting ramifications:
      - Theoretically, there should be enough similar pictures to create movie of a ball-kicking fight between Lennon and Bush.
      - You would have just also recreated the entire world's supply of past and future porn, albeit thumbnailed down to 255*255, and limited to 65k color.
      - You would have produced at least one picture of a second shooter on the grassy knoll, even if there wasn't one to begin with.

      --
      I prefer rogues to imbeciles because they sometimes take a rest.
    4. Re:Super photogenesis by egomaniac · · Score: 5, Informative

      Far, far longer than that. Even if we assume only 1 bit per pixel, 255x255=65025 bits. So each bitmap is basically just a number, 65025 bits long, and you want all permutations of them. So the problem of generating the bitmaps devolves into "count from 0 to 2^65025".

      Of course, 2^65025 is a very, very big number. How long would it take to count that high? Assume you can magically do the increment in one cycle, and you have super-unbelievably fast 4GHz processors with absolutely no overhead and perfect scalability. You also do no processing on the image whatsoever, you simply iterate through them. So each core is processing a phenomenal 4 billion images every second. You have 500 cores, so you're chewing through a grand total of 2 trillion images a second. Wow, that's pretty damned fast!

      2 trillion is almost 2^41. So if you're getting through 2^41 images every second, that means it will take a mere... 2^65025 / 2^41 = 2^1586 seconds.

      There are roughly 2^25 seconds in a year, so that means you're going to be able to complete this count in a mere 2^63 years. That's 9 billion billion years, much longer than the lifespan of the universe. And that's merely to iterate through the images with no processing whatsover. Increase the computing power by a factor of a billion, and it would still take 9 billion years just to count them.

      --
      ZFS: because love is never having to say fsck
    5. Re:Super photogenesis by Crookdotter · · Score: 4, Insightful

      You would also have everything possible within 255X255, but as images can be tiled, you would also have an almost infinite canvas with infinite possibilities.You want a time machine? Well, if it's possible, then SOMEWHERE in these images is the blueprints, chopped into nice 255X255 chunks.

      As well as all porn being thumbnailed, why not find the tiles for it in HD resolution instead? Or better yet, in 10000X10000 pixels?

      So in essence, such a program would spit out every frame of every movie, in better than current HD resolution, that will ever be made by humans (or aliens, or anything). It would also contain the entire set of human books, past and future, and alien books for that matter, along with the correct method to translate it. It would have every bit of knowledge possible to fit into a 2 dimensional representation written down for us to read right now.

      Which is all very exciting until you realise that it is, of course, not possible to do with computers in any meaningful timescale within a Universe, and for every correct set of blueprints for a time machine there must be an almost infinite set of incorrect ones which are indistinguishable from all the others until you build it.

      As an interesting aside, I wonder what size bitmap it IS capable for - 2X2? 4X4?

  8. Run protein folding by Plazmid · · Score: 5, Interesting

    Protein folding really helps us biologists A LOT, so please run it. http://folding.stanford.edu/

  9. Well.. by dreamchaser · · Score: 4, Funny

    There was this one incident when me and this girl turned a cabinet over on it's side and used it as a surface for sex play. That was different. It didn't get weird until she insisted that I tie her wrists with some Cat 5 though.

    1. Re:Well.. by bitflip · · Score: 5, Funny

      That *is* weird.

      Cat 6 is much better.

    2. Re:Well.. by JustCallMeRich · · Score: 5, Funny

      So - you are suggesting a clusterf*ck?....

      --
      http://Communityville.com - A free place for new and old neighborhood webmasters to hang out.
  10. Give me an account...I'm being serious by itamblyn · · Score: 5, Interesting

    I'm doing computational condensed matter physics for my PhD. If you give me an account, I can keep your cluster at full load while you're not using it. :) The type of stuff I run can span hundreds of processors over (sorry to say it) slow interconnects like GigE. If you let me use it, I'll acknowledge you in all publications AND I'll make you some pretty pictures (materials under extreme conditions make for cool figures).

  11. "We're gonna need a bigger map..." by lemur666 · · Score: 5, Funny

    Anyone else think a 2^16 vs. 2^16 Team Fortress game would be pretty cool?

    --
    Corollary to Hanlon's razor: Any significantly advanced stupidity is indistinguishable from malice.
  12. Why not... by zappepcs · · Score: 5, Interesting

    as some have said, donate the time to people would like to buy it but can't, or on odd days turn up 1000 SETI@home processes and see how far it gets?

    Create a reverse Google bomb - Index every link to say 'george bush' from Google, read each page into memory hash the words, assigning value by count amongst all the pages, and then post the top ten words on GW that are not 'the' 'a' 'was' etc.

    Perhaps comparing this to the same process on Paris Hilton would be a report that sparks SkyNet to life. I don't know. Seriously, if those two have 6 of the top ten words in common it would have to mean something.

    If you have all that cpu sitting idle, that is the kind of weird shit nobody else would do, but also couldn't not read the report either. Perhaps you'll start something new for Google Trends? :)

  13. Rendering by Xzzy · · Score: 5, Interesting

    I do burn-in testing on a lot of the machines we get at work, using hardware I can't personally afford.

    My favorite test is to find scenes to render with a raytracer.. yafray is my favorite, runs on all major platforms. But not just any scene, it has to have all the details turned up to 11, contain extremely high detail (polygon counts drive up memory usage), and write out an absurdly large image.

    Kind of whimsical but it's hard to not be impressed by an image 20,000 pixels square with perfectly accurate reflections. Who cares if I can only fit a fraction of it on my monitor. ;)

  14. better yet by goombah99 · · Score: 5, Interesting

    Rosetta @ home or fold.it

    Or you could try to thermally load them in patterns that produced different tones on the fans (or maybe an AM radio) record it then speed it up. Maybe you could make it sound like a baluga whale.

    Or maybe you could implement a virtual machine cluster of 250 cores. The repeat the process till you see how many virtual machines you can stack on top of each other till it has the same speed as a single processor.

    While this might sound stupid this would give us a rough estimate of how many watts per virtual world it takes and from that we could figure out how many layers deep in the simulation we actually live assuming the top level one is powered by something less than 1 sol of power.

    or work out all possible moves in N-space tic-tac-toe. The only smart move is not to play.

    --
    Some drink at the fountain of knowledge. Others just gargle.
    1. Re:better yet by tshetter · · Score: 5, Funny

      While this might sound stupid this would give us a rough estimate of how many watts per virtual world it takes and from that we could figure out how many layers deep in the simulation we actually live assuming the top level one is powered by something less than 1 sol of power.

      Best idea yet.
      We need to learn to hack reality, and take over the simulation.
      Plus hacking reality just sounds awesome.

    2. Re:better yet by Belial6 · · Score: 4, Interesting

      Try to solve chess.

    3. Re:better yet by 19thNervousBreakdown · · Score: 4, Funny

      Buahahahaha! Make it recursive and STACK OVERFLOW THE WORLD!

      --
      <xml><I><am><so><damn>Web 2.0</damn></so></am></I></xml>
    4. Re:better yet by Anonymous Coward · · Score: 5, Insightful

      I think reverse-engineering reality is called "Physics".

  15. Stone Soup by MetricT · · Score: 5, Insightful

    I (Mat) work at Vanderbilt University's supercomputing center. Our university supercomputing center was originally a joint venture between the proteomics and high-energy physics departments, but they decided to make it a independent university-wide initiative to bring HPC tools to all users.

    Before we founded the center, there were a lot of groups that required computing on campus, but it was highly inefficient. Their local clusters had lots of free cycles (low return on asset) that they couldn't effectively share with other users, the clusters were down quite often (grad students and postdocs are poor sysadmins, plus they should be doing actual research anyway). Several other problems related to either pooling of resources or pooling of knowledge, you get the idea...

    I highly recommend setting up a batch scheduler such as Torque/Maui and opening your cluster to all researchers on campus. You'd be surprised how much demand is out there. We have all the usual math/science/engineering/biomedical users, plus users in more esoteric fields (nursing, accounting, music, psychology). You can always give your group a higher job priority if needed. It gives a higher return on asset and gets lots of goodwill on campus (and, potentially, at funding agencies). You can charge users for support, storage, etc for cost recovery, or even use it as a revenue source if your grants allow.

    Having different types of users also allows cross-pollination of ideas. We have a large number of biomedical researchers who are now using a high-energy physics software (geant), biomedial people who are teaching other users how to program in R, etc. These are avenues for research/discovery that didn't exist before.

  16. xkcd by Anonymous Coward · · Score: 5, Interesting
  17. Make applications by neokushan · · Score: 5, Interesting

    Instead of randomly generating pictures or something as someone suggested above, why not make it generate say a 64k program, keep iterating through this until you get an executable that will actually RUN (Without crashing) and see what happens.

    --
    +1 IDisagreeSoHeMustBeATrollOrAnAstroturferOrAShill
  18. Re:Imagine . . . by somersault · · Score: 4, Insightful

    Uh. So the endless Beowulf jokes are funny to you, but the nowhere near as long running Vista ones aren't? You perhaps should go into therapy to resolve your Vista issues. I'm intrigued as to why you consider it better than XP in any way.. apart from apparently the calendar is more comprehensive than XP for tracking changes in our date system over the last while.. but other than that. I honestly don't see the benefits. I'm not being hypocritical either - I was doing fine with 98 until games started requiring XP. And I'm writing this on OS X.

    --
    which is totally what she said
  19. Seriously, there is good research money to be had. by Bananatree3 · · Score: 4, Interesting

    Prize money in the $100K and up ranges are available for primes that are found above 10 million digits. If you can get the cluster to search for a 10 million digit prime and you end up finding it, you'd earn your Department a cool $100,000 in extra funding. I haven't read the exact rules for the Prime95 program invlovement, but you'd still get a good grant for your Dept. from just crunching 1s and 0s on your idle processes.

  20. Nothing like hypocrisy! by Anonymous Coward · · Score: 4, Insightful

    Couldn't you be doing something yourself to save the environment right now - something like turning off YOUR computer instead of browsing slashdot? Oh, wait - that would require YOU to do something. That kind of environmental activism is never as much fun as simply preaching to other people what THEY should be doing. Hypocrisy is SO much fun - carry on!

  21. Other options. by jd · · Score: 5, Interesting
    Rendering, in terms of ray-tracing, is considered trivially parallel - everything can be done in parallel with no interaction. Radiosity, where there is interaction, is potentially much more interesting.

    A variant on the rendering theme: Instead of simulating rays, simulate light wavelets and the modern theory of light. You should have enough compute power there to render reasonable scenes using such a technique.

    Fluid dynamics: This is a popular one, and NASA offer source codes for free for subsonic, supersonic and even hypersonic flows. In fact, they offer quite a number of subsonic ones. They're also not the only source. There's several open-source CFD packages, ranging from river simulations to aircraft simulations.

    Supernovae simulation: There are packages (freeish, rather restricted in access) that allow you to simulate thermonuclear and supernovae explosions within stars. The restrictions are for rather obvious reasons, even though the odds of anyone nasty obtaining a star is, well, unlikely.

    COLOSSUS: There are still a couple of ENIGMA ciphers that have never been broken, which can be obtained along with the algorithm Colossus used in World War II to crack such codes. You could complete the set and maybe discover some lost secret (yeah, right).

    BLAST: Other posters have suggested renting out the computer time, but that just transfers the problem of what to run, rather than solving it. BLAST, or one of the MPI-based variants thereof, is an exceedingly popular tool for examining nucleotide sequences, but as the databases grow ever-larger, the demand for ever-more information also increases, creating a need for significant compute power to produce the volume of results desired.

    --
    It's a small world and it smells funny; I'd buy another if it wasn't for the money; Take back what I paid (SoM)
  22. Only the second time? by Anonymous Coward · · Score: 5, Funny

    You must be new here (I guess this one also qualifies as a classic)