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Thread: One quintillion calculations per second

  1. #1 One quintillion calculations per second 
    Forum Radioactive Isotope cosmictraveler's Avatar
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    May 2005
    Key West, Florida, Earth
    It's expected that the world's supercomputers will be capable of breaking the exascale barrier, or one quintillion calculations per second within 10 to 20 years.

    How do they do it? I wonder what the new designs will be like.

    The potential speed-up of an algorithm on a parallel computing platform is given by Amdahl's law, originally formulated by Gene Amdahl in the 1960s.[11] It states that a small portion of the program which cannot be parallelized will limit the overall speed-up available from parallelization. A program solving a large mathematical or engineering problem will typically consist of several parallelizable parts and several non-parallelizable (sequential) parts. If is the fraction of running time a program spends on non-parallelizable parts, then
    is the maximum speed-up with parallelization of the program. If the sequential portion of a program accounts for 10% of the runtime, we can get no more than a 10 speed-up, regardless of how many processors are added. This puts an upper limit on the usefulness of adding more parallel execution units. "When a task cannot be partitioned because of sequential constraints, the application of more effort has no effect on the schedule. The bearing of a child takes nine months, no matter how many women are assigned

    Last edited by cosmictraveler; March 31st, 2013 at 06:31 PM.
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