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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

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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