tuned STREAM on IBM eServer p5 570 (1900 MHz, 4 cpu)

From: Frank Johnston (fjohn@us.ibm.com)
Date: Mon Jul 12 2004 - 16:10:27 CDT

  • Next message: Frank Johnston: "standard STREAM on IBM eServer p5 570 (1900 MHz, 8 cpu)"

    IBM eServer p5 570 (1900 MHz, 4 cpu, 36MB L3 cache) with DDR2 memory.

     Requesting Large Pages
     Setting up for 2 CPUs per module
     Number of segments per array = 2
     CPU binding list : 0 2
     Shared Segment Pointer = 504403158265495552
     Shared Segment Pointer = 504403158802366464
     Shared Segment Pointer = 504403159339237376
     Segment Size (B) = 268435456 (MB = 256 )
     Array Size (B) = 536870912 (MB = 512 )
     Array Size (DW) = 67108864
     Num_threads = 4
     Num_threads = 4
     Num_threads = 4
     Num_threads = 4
     rebind: num_parthds is 4
     Starting Initialization
     Done With Initialization
     a(1) 1.00000000000000000
     b(M) 1.00000000000000000
     c(M) 1.00000000000000000
     Incremental Offset = 1536
     Number of Threads = 4
    ----------------------------------------------
     Double precision appears to have 16 digits of accuracy
     Assuming 8 bytes per DOUBLE PRECISION word
    ----------------------------------------------
     Array size = 67077120
     Offset = 0
     The total memory requirement is 1535 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 41685 microseconds
        (= 41685 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: 26025.7705 .1932 .0412 .0458
    Scale: 24852.8327 .1942 .0432 .0455
    Add: 26117.5797 .2072 .0616 .0627
    Triad: 26214.3126 .2072 .0614 .0626
     Sum of a is = 101872569543750.000
     Sum of b is = 20374513908750.0000
     Sum of c is = 27166018545000.0000

    This archive was generated by hypermail 2.1.4 : Tue Jul 13 2004 - 08:50:46 CDT