Re: STREAM Bandwidth results

From: Michael Kukat (michael@unixiron.org)
Date: Wed Nov 13 2002 - 11:49:44 CST

  • Next message: Michael Kukat: "Re: STREAM Bandwidth results"

    Hello again,

    here comes the next one:

    Vendor: DEC
    System: DECsystem 5500, MIPS R3000, 160 MB RAM, clock_wall.c (clock_cpu.c
    OS : Ultrix-4.5 RISC
    didn't compile)
    Build : cc -o /tmp/stream -O2 -s stream_d.c second_wall.c -lm

    Results don't differ among runs, -O2 gave best results.

    (McCalpin's Note: This system was first available in November 1990)

    Result:

    -------------------------------------------------------------
    This system uses 8 bytes per DOUBLE PRECISION word.
    -------------------------------------------------------------
    Array size = 2000000, Offset = 0
    Total memory required = 45.8 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 1200000 microseconds.
       (= 120 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: 26.0163 1.2320 1.2300 1.2400
    Scale: 26.6667 1.2040 1.2000 1.2100
    Add: 25.0000 1.9230 1.9200 1.9400
    Triad: 23.3010 2.0660 2.0600 2.0700

    ...Michael 

    -- 
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