tuned STREAM on IBM System p5 560Q (16CPUs 1.5 GHz)

From: Ly Vu (lyvu@us.ibm.com)
Date: Sun Feb 12 2006 - 20:34:13 CST

  • Next message: Ly Vu: "standard STREAM on IBM System p5 560Q (16CPUs 1.5 GHz)"

    These are tuned STREAM results on an IBM System p5 560Q
    with sixteen 1.5 GHz cpus. This is a POWER5+ SMP machine.
    Large pages were used in all cases.

    Function Rate (MB/s) RMS time Min time Max time
    Copy: 33775.03 .13 .13 .14
    Scale: 33159.07 .13 .13 .13
    Add: 40133.18 .16 .16 .16
    Triad: 40777.22 .16 .16 .16

    Here is the full output file:
    --------------------------------------------------

     Requesting Large Pages
     Setting up for 2 CPUs per module
     Number of segments per array = 8
     CPU binding list : 0 2 4 6 8 10 12 14
     Shared Segment Pointer = 504403158265495552
     Shared Segment Pointer = 504403160412979200
     Shared Segment Pointer = 504403162560462848
     Segment Size (B) = 268435456 (MB = 256 )
     Array Size (B) = 2147483648 (MB = 2048 )
     Array Size (DW) = 268435456
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     Num_threads = 16
     rebind: num_parthds is 16
     Starting Initialization
     Done With Initialization
     a(1) 1.00000000000000000
     b(M) 1.00000000000000000
     c(M) 1.00000000000000000
     Incremental Offset = 512
     Number of Threads = 16
    ----------------------------------------------
     Double precision appears to have 16 digits of accuracy
     Assuming 8 bytes per DOUBLE PRECISION word
    ----------------------------------------------
     Array size = 268305408
     Offset = 0
     The total memory requirement is 6141 MB
     You are running each test 5 times
     The *best* time for each test is used
     ----------------------------------------------------
     Your clock granularity appears to be less than one microsecond
     Your clock granularity/precision appears to be 1 microseconds
     The tests below will each take a time on the order
     of 130139 microseconds
        (= 130139 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: 33775.03 .13 .13 .14
    Scale: 33159.07 .13 .13 .13
    Add: 40133.18 .16 .16 .16
    Triad: 40777.22 .16 .16 .16
     Sum of a is = 407488838400000.000
     Sum of b is = 81497767680000.0000
     Sum of c is = 108663690240000.000

    ______________________________________________
    Ly Vu
    IBM Corp. - Austin, Texas.
    AIX/pSeries Performance

    Phone : (512) 838-8228
    Email : lyvu@us.ibm.com



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