Better stream results for Mac G5

From: Bradley Lucier (lucier@math.purdue.edu)
Date: Fri Jul 02 2004 - 15:54:53 CDT

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    These are the stream results with IBM's XLC 6.0 compiler with
         92 22:18 /opt/ibmcmp/vac/6.0/bin/cc -O5 stream_d.c second_cpu.c
    on a dual 2.0GHz G5:

    [xsun21:~] lucier% ./a.out
    -------------------------------------------------------------
    This system uses 8 bytes per DOUBLE PRECISION word.
    -------------------------------------------------------------
    Array size = 40000000, Offset = 0
    Total memory required = 915.5 MB.
    Each test is run 10 times, but only
    the *best* time for each is used.
    -------------------------------------------------------------
    Your clock granularity/precision appears to be 9999 microseconds.
    Each test below will take on the order of 220000 microseconds.
        (= 22 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: 3368.4258 0.1951 0.1900 0.2000
    Scale: 2909.0972 0.2230 0.2200 0.2300
    Add: 2526.3186 0.3810 0.3800 0.3900
    Triad: 2526.3190 0.3871 0.3800 0.4100



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