Serverworks chip sets

Steffen Persvold sp at scali.no
Mon Dec 11 13:10:41 EST 2000


Here are a more meaningful comparision. The comparison is between a Tyan
S2510 based on the LE chipset and a Supermicro 370DER based on the HE-SL
chipset.

Both machines are equipped with 2x PIII-800EB(133) CPUs and 512MByte
PC-133 SDRAM

Using one CPU:

370DER:
   ----------------------------------------------
    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  20 times
    --
    The *best* time for each test is used
    *EXCLUDING* the first and last iterations
    ----------------------------------------------------
    Your clock granularity appears to be less than one microsecond
    Your clock granularity/precision appears to be      1 microseconds
    ----------------------------------------------------
   Function     Rate (MB/s)  Avg time   Min time  Max time
   Copy:        374.2689      0.0855      0.0855      0.0856
   Scale:       401.9594      0.0796      0.0796      0.0797
   Add:         475.5536      0.1010      0.1009      0.1010
   Triad:       475.1911      0.1011      0.1010      0.1012
    ----------------------------------------------------
    Solution Validates!
    ----------------------------------------------------

S2510:
   ----------------------------------------------
    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  20 times
    --
    The *best* time for each test is used
    *EXCLUDING* the first and last iterations
    ----------------------------------------------------
    Your clock granularity appears to be less than one microsecond
    Your clock granularity/precision appears to be      1 microseconds
    ----------------------------------------------------
   Function     Rate (MB/s)  Avg time   Min time  Max time
   Copy:        376.9848      0.0849      0.0849      0.0851
   Scale:       375.0191      0.0854      0.0853      0.0854
   Add:         483.7248      0.0993      0.0992      0.0994
   Triad:       484.5352      0.0991      0.0991      0.0991
    ----------------------------------------------------
    Solution Validates!
    ----------------------------------------------------

Using both CPUs (OMP makes it a bit easier and adds the numbers for me):
370DER:
   ----------------------------------------------
    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  20 times
    --
    The *best* time for each test is used
    *EXCLUDING* the first and last iterations
    ----------------------------------------------------
    Your clock granularity appears to be less than one microsecond
    Your clock granularity/precision appears to be      1 microseconds
    ----------------------------------------------------
   Function     Rate (MB/s)  Avg time   Min time  Max time
   Copy:        468.8234      0.0686      0.0683      0.0693
   Scale:       479.3794      0.0669      0.0668      0.0671
   Add:         541.0826      0.0888      0.0887      0.0888
   Triad:       542.6429      0.0885      0.0885      0.0886
    ----------------------------------------------------
    Solution Validates!
    ----------------------------------------------------

S2510:
   ----------------------------------------------
    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  20 times
    --
    The *best* time for each test is used
    *EXCLUDING* the first and last iterations
    ----------------------------------------------------
    Your clock granularity appears to be less than one microsecond
    Your clock granularity/precision appears to be      1 microseconds
    ----------------------------------------------------
   Function     Rate (MB/s)  Avg time   Min time  Max time
   Copy:        353.0918      0.0916      0.0906      0.0926
   Scale:       355.3543      0.0918      0.0901      0.0931
   Add:         397.2821      0.1213      0.1208      0.1222
   Triad:       397.7756      0.1218      0.1207      0.1225
    ----------------------------------------------------
    Solution Validates!
    ----------------------------------------------------


As you can see the two-way interleaving helps a bit on a Dual-CPU run
(~35% more bandwidth)

Best regards,
-- 
  Steffen Persvold               Systems Engineer
  Email : mailto:sp at scali.no     Scali AS (http://www.scali.com)
  Tlf   : (+47) 22 62 89 50      Olaf Helsets vei 6
  Fax   : (+47) 22 62 89 51      N-0621 Oslo, Norway

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