Vtech G5 Supercomputer Linpack Performance Revealed

Discussion in 'Macintosh Computers' started by Cubeboy, Oct 20, 2003.

  1. Cubeboy macrumors regular

    Joined:
    Mar 25, 2003
    Location:
    Bridgewater NJ
    #1
    Can be found as entry six (page 53) on this pdf

    Pretty impressive, not as outstanding as many of us might have hoped but impressive nonetheless. :)
     
  2. Abstract macrumors Penryn

    Abstract

    Joined:
    Dec 27, 2002
    Location:
    Location Location Location
    #2
    Firstly, I really don't know if it did well when compared to the other machines since I don't recognize them.

    Secondly, its on page 55. The computers were listed in order from fastest to slowest, I think.

    Thirdly, if Apple really did well for a desktop, then sweet!!! :cool:
     
  3. arn macrumors god

    arn

    Staff Member

    Joined:
    Apr 9, 2001
    #3
    Re: Vtech G5 Supercomputer Linpack Performance Revealed

    Only 256 processors => 128 machines.

    The final cluster has 1100 machines (2200 processors).

    arn
     
  4. Rower_CPU Moderator emeritus

    Rower_CPU

    Joined:
    Oct 5, 2001
    Location:
    San Diego, CA
    #4
    According to my quick math, that puts it in 9th with a score of around 7055 GFlops, if we extrapolate the score for 256 CPUs (821GFlops x 8.59).

    Not in the top 5 like some had hoped, but not bad either.
     
  5. legion macrumors 6502a

    Joined:
    Jul 31, 2003
    #5
    Rower

    The problem is clusters scale far from linearly (or if working off of your mathematical extrapolation, a step-based linear profile.) That means, unless the current results for the 256 CPUs was far from optimized, there's a fairly good chance the final cluster may never even breach the top 10 (or 20.)
     
  6. Rower_CPU Moderator emeritus

    Rower_CPU

    Joined:
    Oct 5, 2001
    Location:
    San Diego, CA
    #6
    But until we actually see a Linpack score on the whole cluster, all we can do is extrapolate.

    Show me a figure you think works better.
     
  7. MacsRgr8 macrumors 604

    MacsRgr8

    Joined:
    Sep 8, 2002
    Location:
    The Netherlands
  8. applemacdude macrumors 68040

    applemacdude

    Joined:
    Mar 26, 2001
    Location:
    Over The Rainbow
    #8
    Wouldn't the perform better if they had Panther on it?
     
  9. Freg3000 macrumors 68000

    Freg3000

    Joined:
    Sep 22, 2002
    Location:
    New York
    #9
    Do they even have Jaguar on them?
     
  10. daveL macrumors 68020

    daveL

    Joined:
    Jun 18, 2003
    Location:
    Montana
    #10
    From what I've read, they were running beta Panther from the start.

    On HPC codes like this, the cluster should scale very close to linear. It's sorta like folding.
     
  11. Cubeboy thread starter macrumors regular

    Joined:
    Mar 25, 2003
    Location:
    Bridgewater NJ
    #11
    It seems that there is alot of confusion (most of which can be attributed to my own ineptitude in providing the wrong page) concerning exactly where the Virginia Tech supercomputer results are posted.

    In my recklessness, I had inadvertently provided you with the wrong page number. The Virginia Tech supercomputer result is actually located on page 53. As Abstract pointed out, there is indeed another G5 cluster located on page 55 of the pdf. This discreprency would probably be the source of the confusion.

    So, once again, the Virginia Tech supercomputer Linpack HPC result is located on page 53, there is a second much smaller G5 cluster located on page 55. I have also taken the liberty to post Vtech results on this thread as well as provide a definition for all the terms (as requested by Abstract).

    Legend
    Rmax: sustained performance for the largest problem run
    Nmax: size of the largest problem run
    Rpeak: theoretical peak performance of supercomputer

    I will be only focusing on Rmax since it's really what determines the supercomputer's rank on the top 500.

    Virginia Tech supercomputer:
    2112 G5s@2.0 GHz used
    Rmax: 7417 GFLOP/S
    Rank: #6

    Linux NetworX supercomputer
    2304 Xeons@2.4 GHz used
    Rmax: 7634 GFLOP/S
    Rank: #5

    ASCI Q
    8160 Alpha EV68@1.25 GHz used
    Rmax: 13880 GFLOP/S
    Rank: #2

    Earth Simulator
    5120 ??? processors
    Rmax: 35860 GFLOP/S
    Rank: #1
     
  12. Rower_CPU Moderator emeritus

    Rower_CPU

    Joined:
    Oct 5, 2001
    Location:
    San Diego, CA
    #12
    Thanks for the clarification.

    Something interesting to note:
    # of CPUs = 2112

    So not all 1100 G5s are in the cluster. Playing the linear extrapolation game again gives a score of about 7726 Gflops, putting it in 4th, one Gflop behind one of the AlphaServers with 4096 1.25GHz CPUs.
     

Share This Page