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The Little Green500 List - November 2010

The Little Green500 seeks to be more inclusive in its definition of a supercomputer and continues to strive towards the goal of raising awareness in the energy efficiency of supercomputing. Conventional wisdom tells us that the larger a machine is, the lower its efficiency. However, the current Little Green500 shows us that even the largest machines can compete on efficiency with their smaller counterparts.
The four most uniquely greenest supercomputers on the Green500 also sit atop the Little Green500.

  • IBM BlueGene/Q, the "Greenest Supercomputer in the World"
  • GRAPE-DR, the "Greenest Exotic Supercomputer in the World"
  • Tsubame 2.0, the "Greenest Production Supercomputer in the World"
  • EcoG, the "Greenest Self-Built Supercomputer in the World"

Tsubame 2.0 is unique on the list in having submitted a subset of the machine to the Little Green500, increasing the efficiency of the submission from 958.35 Mflops/Watt on the Green500 to 1,031.92 Mflops/Watt on the Little Green500. We hope that more submissions will include numbers for the Little Green500 in the future. The first machine on the Little Green500 that is not on the current edition of the Green500 is the Jazz supercomputer at #5, which shares much of its design with the larger GPU supercomputers and results in similar
efficiency. Of the rest of the 10 greenest supercomputers on the Green500, only 3 are holdovers from the previous release, the QPACE PowerXCell machines from IBM.

As with the Green500, the Little Green500 is dominated by accelerator-based supercomputers. In fact, only one machine of the 10 greenest on the Little Green500 is based on standard CPUs, the Fujitsu K computer based on the SPARC64 architecture. Even though we continue to see a trend of large supercomputers competing better than expected with their smaller counterparts, the Little Green500 continues to see greater average efficiency than the Green500 list with an average of 236 Mflops/Watt over the 172.66 Mflops/Watt seen on the Green500 list this release.

Listed below are the Little Green500's Top 10 most energy-efficient supercomputers in the world as of November 2010.

The Green500 List

Listed below are the November 2010 Little Green500's energy-efficient supercomputers ranked from 1 to 10.

Green500 Rank MFLOPS/W Site* Computer* Total Power