Stream results, Athlon 800

From: H.W. Stockman (
Date: Tue May 30 2000 - 19:24:12 CDT

  • Next message: Frank de Lange: "stream results"

    This is a custom-built system with an Athlon 800 in an ASUS K7V motherboard,
    768 MB PC133 (7.5 ns) SDRAM. The memory bus was set to asynchronous mode,
    with a 4:3 multiplier of the CPU FSB, and memory timing at 3-2-2.

    It turns out that it is currently hard to get truly fast SDRAM in 256 MB DIMMs.

    I took the source code and recompiled it with Lahey F90 4.5, to take advantage
    of the advanced timer. I hope that's OK. Your wstream executable gave somewhat
    odd results on this win98 system.
    Double precision appears to have 16 digits of accuracy
    Assuming 8 bytes per DOUBLE PRECISION word
    Array size = 2000000
    Offset = 0
    The total memory requirement is 45 MB
    You are running each test 10 times
    The *best* time for each test is used
    Your clock granularity/precision appears to be 4 microseconds
    The tests below will each take a time on the order
    of 95864 microseconds
       (= 23966 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) RMS time Min time Max time
    Copy: 376.0116 0.0866 0.0851 0.0926
    Scale: 427.8838 0.0757 0.0748 0.0821
    Add: 473.2809 0.1044 0.1014 0.1256
    Triad: 571.6290 0.0986 0.0840 0.1823
    Sum of a is = 0.230660156259187D+019
    Sum of b is = 0.461320312485644D+018
    Sum of c is = 0.615093750014126D+018

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