What is the true cost of linpack james a ang ph d sandia national laboratories
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What is the True Cost of Linpack ? James A. Ang , Ph.D. Sandia National Laboratories PowerPoint PPT Presentation


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SAND2013-3351P. What is the True Cost of Linpack ? James A. Ang , Ph.D. Sandia National Laboratories. Disclaimer: The opinions e xpressed d o not represent Sandia, NNSA/ASC, SC/ASCR, or DOE policy. 1. Assumptions. Leadership class system: C ost: $200M Lifetime: 4 years

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What is the True Cost of Linpack ? James A. Ang , Ph.D. Sandia National Laboratories

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What is the true cost of linpack james a ang ph d sandia national laboratories

SAND2013-3351P

What is the TrueCost of Linpack?James A. Ang, Ph.D.Sandia National Laboratories

Disclaimer: The opinions expressed do not represent Sandia, NNSA/ASC, SC/ASCR, or DOE policy

1


Assumptions

Assumptions

  • Leadership class system:

    • Cost: $200M

    • Lifetime: 4 years

    • Power consumption: 10MW

  • Cost of one MW-year is $1M

  • Linpack measurement requires system for a week

    • To achieve a high fraction of peak requires a large problem size so a typical MP Linpack run takes a day

      • Multiple runs are made as initial tests are run with “small” problems

      • Successive tests use larger and larger problem sizes, some of these tests will “fail” – requiring re-runs

2


Cost estimates

Cost Estimates

  • Electricity Cost

    • One week of usage ≈ [1/50 year] x 10MW = 0.20 MW-year = $0.2M

  • Amortized CapEx Cost

    • Opportunity cost associated with one week of usage

    • One week of dedicated system time is 1/200th of the life of the machine

      • That week represents 1/200 of the cost of the system or $1M

      • The cost for one week of time on a new system is > $1M

  • Staff Cost

    • One week of how many peoples’ loaded salaries?

    • How many are working around the clock?

      • Pizzas, Fried Chicken, Breakfast Burritos, Beer, Ice Cream, etc.

3


The true cost of linpack

The True Cost of Linpack

  • The fact that MP Linpack has been the Primary Metric for the Supercomputing community has another cost

    • Because leadership class system architects are motivated by the Top500 list, HPC systems have suffered from distorted priorities that skew system balance

    • The resulting poor fraction of peak performance for our mission applications is an element of the true cost of Linpack

  • This cost: Priceless

  • DOE efforts to define proxy apps that reflect how our real apps use balanced system architectures will help


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