SGI Origin 3800, 400 MHz MIPS R12K: 128 CPU STREAM Result

From: Wesley Jones (wesley@sgi.com)
Date: Thu Aug 24 2000 - 13:44:00 CDT

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    SGI Origin 3800
    400 MHz MIPS R12K
    8 MB cache
    96 GB Main Memory
    IRIX 6.5.9

    Results:
    ----------------------------------------------
     Double precision appears to have 16 digits of accuracy
     Assuming 8 bytes per DOUBLE PRECISION word
    ----------------------------------------------
     Array size = 640000000
     Offset = 0
     The total memory requirement is 14648 MB
     You are running each test 4 times
     The *best* time for each test is used
     ----------------------------------------------------
     Your clock granularity/precision appears to be 1 microseconds
     The tests below will each take a time on the order
     of 168363 microseconds
        (= 168363 clock ticks)
     Increase the size of the arrays if this shows that
     you are not getting at least 20 clock ticks per test.
     ----------------------------------------------------
     WARNING -- The above is only a rough guideline.
     For best results, please be sure you know the
     precision of your system timer.
     ----------------------------------------------------
    Function Rate (MB/s) Min time Max time Mean time RMS time Median
    Copy: 43264.76 0.2367 0.2380 0.2375 0.2375 0.2378
    Scale: 42975.19 0.2383 0.2416 0.2403 0.2403 0.2407
    Add: 50937.02 0.3015 0.3029 0.3023 0.3023 0.3025
    Triad: 50562.21 0.3038 0.3047 0.3043 0.3043 0.3042
    -----------------------------------------------------------------------------
     All times are
        0.2375 0.2383 0.3029 0.3041
        0.2380 0.2406 0.3020 0.3047
        0.2376 0.2409 0.3029 0.3038
        0.2367 0.2416 0.3015 0.3047
    -----------------------------------------------------------------------------
     Sum of a is = 197.7539062609455
     Sum of b is = 39.55078124652111
     Sum of c is = 52.73437499310039

    Note: Some output has been modified to handle supercomputer class problem.
    E.G. output of array size changed from i4 to i6. Code available if required.

    WEs

    -- 
    Wesley B. Jones, PhD                    wesley@sgi.com
    SGI, Boulder, CO                        Phone: (303)-448-1165
    Performance Engineering                 FAX:
    



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