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  • balahindustani@gmail.comJanuary 2, 2006 7:25 AM PST   
    Intel optimised Linpack scaling comparision
    The intel optimised linpack (n=1000) that is run a 16 way server has given the following results that is causing a little concern.

    with
    1 thread and 1 cpu : 5.8731 Gflops
    4 thread and 4 cpu : 15.101 Gflops
    8 thread and 8 cpu : 15.107 Gflops
    16 thread and 16 cpu : 12.471 Gflops

    I am not to trace what could be the problem?
    Please help.

    Bala

    Clay Breshears (Intel)January 3, 2006 4:34 PM PST
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    Re: Intel optimised Linpack scaling comparision

    Bala -

    At only 1000 rows and columns, the workload is likely too small to sustain good speedup for 16 threads (just over 60 rows per thread).  System and threading overheads are likely taking a relatively larger fraction of time to the work being done, which reduces Gflops.

    What kind of speeds do you get for larger values of n (e.g., 5000, 10000, 20000)?

    --clay



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